SUSY07

25 Jul 2007, 16:00 → 1 Aug 2007, 14:00 Europe/Zurich

Physics Building (Karlsruhe University)

Dieter Zeppenfeld (Karlsruhe University), Wim de Boer (Karlsruhe University)

The 15th International Conference on Supersymmetry and the Unification of Fundamental Interactions.

Wednesday, 25 July

19:00 → 22:00 Welcome Drink

On-site registration opens.

Click here for further information.

Thursday, 26 July

09:00 → 10:00 Plenary Session

09:00 Welcome

Speaker: Detlef Loehe

09:15 Supersymmetry, from its Beginning to its Deformation

Speaker: Julius Wess

10:00 → 10:30 coffee break

10:30 → 12:00 Plenary Session

10:30 Status of Cosmology

Speaker: Edward Kolb

Slides Kolb-SUSY07.pdf Tully_Voyage_to_the_Virgo_Cluster.pdf

11:15 Anticipating a New Golden Age

Speaker: Frank Wilczek

Paper frank_wilczek_susy07.pdf

Slides susy07v4.pdf

14:00 → 16:00 Alternatives 1

14:00 Warped/Composite Phenomenology Simplified

I will present a simple effective Lagrangian description of warped extra-dimensional theories which includes the Standard Model particles and the first TeV-scale excitations. This economical approach to warped/composite theories greatly simplifies their phenomenological investigation and collider searches.

Speaker: Roberto Contino (CERN)

Slides SUSY07.pdf

14:20 Collider signatures of new heavy quarks

Heavy quarks which mix with the Standard Model states appear in many new physics scenarios. We study signatures of such generic heavy quarks at hadron colliders as a function of their mass and mixing. We explore the interesting channel of single production of heavy quarks via electroweak processes. This channel has improved sensitivity compared to the kinematically suppressed QCD pair production at slightly large masses (where pair production falls rapidly). We find that the current run of the Tevatron with 2 fb-1 integrated luminosity has significant sensitivity for the production of such heavy quarks. One example of a new physics scenario where this analysis is applicable is models of warped extra dimensions with custodial symmetry. Such models have light Kaluza-Klein excitations of the fermions which could lead to possible direct detection of extra dimensions at the Tevatron.

Speaker: Anupama Atre (University of Wisconsin - Madison)

Slides Atre_Susy07.pdf

14:40 Warped Gravitons at the LHC and Beyond

We study the production and decay of Kaluza-Klein (KK) gravitons at the Large Hadron Collider (LHC), in the framework of a warped extra dimension in which the Standard Model (SM) fields propagate. Such a scenario can provide solutions to both the Planck-weak hierarchy problem and the flavor puzzle of the SM. In this scenario, the production via $q \bar{q}$ annihilation and decays to the conventional photon and lepton channels are highly suppressed. However, we show that graviton production via gluon fusion followed by decay to longitudinal $Z/W$ can be significant; vector boson fusion is found to be a sub-dominant production mode. In particular, the ``golden'' $ZZ$ decay mode offers a distinctive 4-lepton signal that could lead to the observation at the LHC of a KK graviton with a mass up to $\sim 2$ TeV for the ratio of the AdS$_5$ curvature to Planck scale modestly above unity. We argue that (contrary to the lore) such a size of the curvature scale can still be within the regime of validity of the framework. Upgrades beyond the LHC design are required to discover gravitons heavier than $\sim 4$ TeV, as favored by the electroweak and flavor precision tests.

Speaker: Dr Hooman Davoudiasl (Brookhaven National Laboratory)

Slides susy07Davoudiasl.pdf

15:00 Searching for the Kaluza-Klein Graviton in Bulk RS Models

The best-studied version of the RS1 model has all the Standard Model particles confined to the TeV brane. However, recent variants have the Standard Model fermions and gauge bosons located in the bulk five-dimensional spacetime. We study the potential reach of the LHC in searching for the lightest KK partner of the graviton in the most promising such models in which the right-handed top is localized very near the TeV brane and the light fermions are localized near the Planck brane. We consider both detection and the establishment of the spin-2 nature of the resonance should it be found.

Speaker: Jared Kaplan (Harvard University)

Slides KaplanKKGravPresentation.pdf KaplanKKGravPresentation.ppt

15:20 The Randall-Sundrum model and high-P_T tops

In many Randall-Sundrum constructions a large fraction of the new physics shows up as resonances in the t-tbar spectrum. These tops are produced at high invariant mass and p_T, and hence the decay products are highly collimated. This presents interesting challenges for observation. We show that, not only can these resonances be observed, but studies of their properties can reveal much information about the underlying model.

Speaker: Ben Lillie (Argonne / U. Chicago, EFI)

Slides Lillie-RS-PHENO07.pdf

15:40 Non-SUSY searches at HERA

Non-SUSY searches at HERA

Speaker: Peter Schleper (CERN)

Paper SUSY07_Schleper.pdf.pdf

Slides SUSY07_Schleper.pdf

14:00 → 16:00 Colliders - Higgs Phenomenology 1 (Experiment)

14:00 Search for Associated Production of Higgs and EW Bosons at the Tevatron

Presenting results from D0 and CDF

Speaker: Meenakshi Narain (Brown University)

Slides SUSY07-Narain.pdf SUSY07-Narain.ppt

14:30 Search for Higgs Bosons in H to WW Decays at the Tevatron

Results from CDF and D0.

Speaker: Nils Krumnack (Baylor University)

Paper 0710.5127.pdf

Slides SUSY07.pdf

15:00 Search for Supersymmetric Neutral Higgs Bosons at the Tevatron

Speaker: Tim Scanlon (Imperial College, London)

Paper tim_scanlon_SUSY07_arXiv0710.5049v1.pdf.pdf

Slides TevHiggsSUSY.pdf TevHiggsSUSY.ppt

15:30 Search for Higgs decays to tau lepton pairs

Speaker: Ilya Kravchenko (Massachusetts Institute of Technology (MIT))

Paper hep-ex_arXiv_0710.5141v1.pdf

Slides talk_susy07_v3.pdf

14:00 → 16:00 Colliders - Susy Phenomenology 1 (Theory)

Chairperson: Werner POROD

14:00 Towards reconstructing the SUSY Lagrangian with Fittino

If SUSY is realized at the TeV scale, it will likely be discovered at the LHC. After discovery, it is crucial to gain information about SUSY Lagrangian parameters from the measured observables with minimal prejudice. Fittino is a program which performs a global fit of a defineable set of parameters to observables accessible at the LHC and the ILC. We will give examples of such fits, report on progress towards implementing LHC observable in a more direct way as well as on inclusion of low energy observables into the fit.

Speaker: Philip Bechtle (DESY)

Slides PBe_SUSY07.pdf

14:20 SFitter: Reconstructing the MSSM Lagrangian from LHC data

The LHC provides us with new possibilities to test physics at the TeV scale and look for signs of new physics beyond the Standard Model. If supersymmetry at the TeV scale is realised in nature, LHC will be able to find many new particles and measure cross sections and branching ratios which differ significantly from Standard Model expectations. Then the question will arise: "What is the value of the fundamental parameters in the MSSM Lagrangian?" SFitter is a tool to answer this question. It takes the LHC data as input and performs a scan over the parameter space using the unconstrained TeV-scale MSSM Lagrangian. A newly developed Weighted-Markov-Chain technique performs this task in a more efficient way. Besides finding the best fit, SFitter also produces a ranked list of secondary minima and a likelihood map, which can be integrated over several parameters to produce one- or two-dimensional probability maps.

Speaker: Dr Michael Rauch (University of Edinburgh)

Paper rauch_susyproc.pdf

Slides Rauch.pdf.pdf

14:40 SUSY breaking now easy and generic

It used to be believed that SUSY breaking was difficult and required very special models with specific gauge groups and particle contents. I show that breaking SUSY and communicating it to the standard model can be done now with a wide variety of gauge groups and particle contents via gauge mediation. I will also discuss its implications on cosmology and collider searches.

Speaker: Hitoshi Murayama (Berkeley National Laboratory)

15:00 About the Running and Decoupling in the MSSM

We discuss two issues related to the precise determination of the input parameters of the supersymmetric QCD. As a first application we propose a consistent evaluation of $\alpha_s$ at the GUT scale in the MSSM based on three-loop running and two-loop matching. In the second part of the talk, the evaluation of the bottom quark mass in the $\overline{\rm DR}$ scheme at the electroweak/SUSY scale with four-loop accuracy will be considered.

Speaker: Dr Luminita Mihaila (TTP-University of Karlsruhe)

Paper 0710.2236.pdf

Slides mihaila_susy07.pdf

15:20 Unitarity constraints on trilinear couplings in the MSSM

For MSSM phenomenology, soft SUSY-breaking dimension-three operators are important, in particular the couplings between Higgs bosons and squarks. In scattering processes, perturbative unitarity is violated at modest center-of-mass energy if these couplings are much larger than the masses of the scalar particles involved. Assuming perturbative unitarity, constraints on the trilinear couplings can be determined using a computer program developed by the authors.

Speaker: Alexander Schüssler (Universtity of Karlsruhe)

Paper 0710.5175.pdf

Slides unitarity.pdf

15:40 LHC/ILC analysis for SUSY scenarios with heavy sfermions

We discuss the potential of combined analyses at LHC and ILC to explore low-energy supersymmetry in a difficult region of the parameter space characterized by masses of the scalar SUSY particles around 2 TeV. Precision analyses of cross sections for light chargino production and forward--backward asymmetries of decay leptons and hadrons at the ILC, together with mass information on chi^0_2 and squarks from the LHC, allow us to determine the underlying fundamental gaugino/higgsino MSSM parameters and to constrain the masses of the heavy, kinematically inaccessible sparticles. No assumptions on a specific SUSY-breaking mechanism are imposed.

Speaker: Dr Gudrid Moortgat-Pick (IPPP Durham)

Paper 07104937.pdf

Slides susy07.pdf

14:00 → 16:00 Cosmology 1

14:00 Indirect search for Dark Matter with the ANTARES neutrino telescope

The ANTARES undersea neutrino telescope consists of a 3D grid of 900 photomultiplier tubes arranged in 12 strings, at a depth of 2475 m in the Mediterranean Sea. After deployment of the first strings in 2006, half of the detector is now fully operational and the complete detector is foreseen to be finished in early 2008. Relic neutralinos produced after the Big Bang are favoured candidates for Dark Matter. They can accumulate at the centre of massive celestial objects like our Sun. Their annihilation can result in a high-energy neutrino flux that could be detectable as a localised emission with earth-based neutrino telescopes like ANTARES. A brief overview of the prospects of the indirect search for Dark Matter particles with the ANTARES detector will be given. The analysis method and expected performance for the detection of the expected neutrinos will be discussed.

Speaker: Mr Gordon Lim (NIKHEF / ANTARES)

Paper gordon_lim_susy07.pdf

Slides Susy07_GordonLim.ppt

14:20 Where.when and how SUSY is showering in the sky

Cosmic Rays and UHECR are reaching highest energy well above LHC ones. Because photopion production they might hide UHE GZK neutrino that may airshower at Earth Horizons. These Airshowers mostly are Tau induced ones. SUSY traces might be also searched inside the same UHECR shower occuring on Earth. Indeed UHE neutralino and other surprising SUSY secondaries may offer a novel Astronomy at the edge by inclined airshowering. We explain why such SUSY and Neutrino traces maybe discovered in present Telescopes. as Magic one, and Gamma Satellites as GLAST , EUSO ones. Where, when and how their traces maybe revealed and disentangled from Neutrino ones will be shown in detalis.

Speaker: Prof. Daniele Fargion (Physics Department, Rome University 1 and INFN Rome)

Slides SUSY_2007-DFargion.pdf SUSY_2007-DFargion.ppt

14:40 Neutrinos from WIMP annihilations

We make an improved analysis on the flow of neutrinos originating from WIMP annihilations inside the Sun and the Earth. We treat both neutrino interaction and oscillation effects in a consistent framework. Our numerical simulations are performed in an event based setting, which is useful for both theoretical studies and for creating neutrino telescope Monte Carlos. We find that the flow of muon-type neutrinos is enhanced or suppressed depending on the dominant WIMP annihilation channel.

Speaker: Mr Mattias Blennow (Royal Institute of Technology)

Paper 0710.1493v1.pdf

Slides blennow-susy07.pdf

15:00 Reflection of Microwave from Energy Deposit by X-ray Irradiation in Rock Salt: Implying Salt Ultra High Energy Neutrino Detector to act like a Radio Bubble Chamber

We found microwave reflection from a small rock salt samples irradiated by X-ray. The reflection rate was consistent with number of ionized electrons by the irradiation. Coherent reflection was indicated by time dependence of the reflection rate. It means the irradiated size could be scaled up to ultra-high energy electromagnetic shower using longer wavelength while the reflection rate is kept. Information from antennae would be utilized to 3D reconstruction of the electromagnetic shower like as a radio bubble chamber. Pulse radar emission power could be as large as MW then radio wave can travel 10 attenuation length (2-3km) to be detected. The construction cost could be reduced much if the radar method is applicable, since number of boreholes can be reduced in which detection antennae are installed.

Speaker: Dr Masami Chiba (Tokyo Metropolitan University)

Paper 0710.4186v1.pdf

Slides chiba_070726_SUSY07.pdf chiba_070726_SUSY07.pdf

15:20 Long lived staus in IceCube from atmospheric neutrinos

The discovery of a long-lived charged particle at future colliders can point towards scenarios where the dark matter (DM) particle is superweakly interacting, and the next-to-lightest particle (NLP) is charged and quasi-stable. Such a situation is expected in several supersymmetric models, including gauge mediation and even minimal supergravity, where the DM particle is the gravitino and the charged NLP is the lightest stau. Probing the nature, and directly detecting the DM particle can be, in this case, extremely challenging. One, if not the only handle one would have is to detect with neutrino telescopes the charged NLP's produced in high energy neutrino collisions with nuclei. Previous studies focused on the production of staus from extra-galactic neutrinos, whose flux is, however, largely uncertain and has not been detected yet. In the present analysis, we study the production of charged NLP's from conventional atmospheric neutrinos and from neutrinos originating from the prompt decay of heavy quarks. We quantify and compare the resulting stau fluxes with what expected from extra-galactic neutrinos. We analyze the dependence of the stau flux on the underlying supersymmetric setup, and point out that even if the extra-galactic flux is very suppressed, prompt decay neutrinos can still provide a sufficient flux of staus at IceCube. We also comment on the flux of charged NLP's expected from proton-proton collisions, and show that it is typically subdominant, and always below detectable rates.

Speaker: Dr Stefano Profumo (Caltech and UC Santa Cruz)

Slides Stefano_Profumo_SUSY07.ppt

15:40 Indirect dark matter search with H.E.S.S.

The annihilations of WIMPs produce high energy gamma-rays in the final state. These high energy gamma-rays may be detected by IACTs such as the H.E.S.S. array of Imaging Atmospheric Cherenkov telescopes. Besides the popular targets such as the Galactic Center or the galaxy cluster as M87, dwarf Sphreroidal galaxies are privileged targets for searching a Dark Matter annihilation signal. H.E.S.S. observations on the Sagittarius dwarf galaxy are presented. The modelling of the Dark Matter halo profile of Sagittarius dwarf is discussed. Constraints on the velocity-weighted cross section of Dark Matter particles are derived in the framework of Supersymmetric and Kaluza-Klein models. The future searches with the incoming phase 2 of H.E.S.S. will be briefly discussed.

Speaker: Emmanuel Moulin (H.E.S.S. Collaboration)

Paper 0710-1.2493.pdf

Slides Moulin_HESS.pdf.pdf

14:00 → 16:00 Theoretical Models (String Theory and Formal Aspects of SUSY) 1

14:00 Dimensional Reduction Applied To Non-SUSY Theories

We consider regularization of a non-supersymmetric Yang-Mills theory by dimensional reduction (DRED). In particular, the anomalous dimensions of fermion masses and gauge coupling are computed to four-loop order. We put special emphasis on the treatment of evanescent couplings which appear when DRED is applied to non-supersymmetric theories. We highlight the importance of distinguishing between the evanescent and the real couplings. Considering the special case of a Super-Yang-Mills theory, we find that dimensional reduction is sufficient to preserve Supersymmetry in our calculations.

Speaker: Mr Philipp Kant (Karlsruhe University)

Minutes 0710.2490.pdf

Slides kant.pdf

14:20 Lattice Formulation of Two Dimensional Topological Field Theory

We investigate an integrable property and observables of 2 dimensional N= (4,4) topological field theory defined on a discrete lattice by using the "orbifolding" and "deconstruction" methods. We show that our lattice model possesses the integrability and the partition function reduces to matrix integrals of scalar fields on sites in consequence. We make clear meaningful differences between the discrete lattice and differentiable manifold, which would be important to a study of topological quantities on the lattice. We also propose a new construction of N=(2,2) supersymmetric lattice theory, which is realized by a suitable truncation of scalar fields from the N=(4,4) theory.

Speaker: Dr Tomohisa Takimi (Theoretical Physics Laboratory, The Institute of Physical and Chemical Research (RIKEN))

Paper 0710.0438v2.pdf

Slides main-takimi.pdf slides

14:40 Graphical Representation of SUSY and Application to QFT

A graphical representation of supersymmetry is presented. It clearly expresses the chiral flow appearing in SUSY quantities, by representing spinors by directed lines (arrows). The chiral suffixes are expressed by the directions (up, down, left, right) of the arrows. The SL(2,C) invariants are represented by wedges. Both the Weyl spinor and the Majorana spinor are treated. We are free from the complicated symbols of spinor suffixes. The method is applied to the 5D supersymmetry. Many applications are expected. The result is suitable for coding a computer program and is highly expected to be applicable to various SUSY theories (including Supergravity) in various dimnesions.

Speaker: Prof. Shoichi Ichinose (University of Shizuoka)

Paper 0710.2569v1.pdf

Slides SUSY07SI.pdf SUSY07SI.ppt

15:00 Supersymmetric three dimensional conformal sigma models

We construct novel conformal sigma models in three dimensions. Nonlinear sigma models in three dimensions are nonrenormalizable in perturbation theory. We use Wilsonian renormalization group equation method to find the fixed points. Existence of fixed points is extremely important in this approach to show the renormalizability. Conformal sigma models are defined as the fixed point theories of the Wilsonian renormalization group equation. The Wilsonian renormalization group equation with anomalous dimension coincides with the modified Ricci flow equation. The conformal sigma models are characterized by one parameter which corresponds to the anomalous dimension of the scalar fields. Any Einstein-K\"{a}hler manifold corresponds to a conformal field theory when the anomalous dimension is $\gamma=-1/2$. Furthermore, we investigate the properties of target spaces in detail for two dimensional case, and find the target space of the fixed point theory becomes compact or noncompact depending on the value of the anomalous dimension.

Speaker: Dr Etsuko Itou (Kyoto University, YITP)

Proceeding arXiv:0710.4604.pdf

Slides e-itou.pdf e-itou.ppt

15:20 Supersymmetry with Ghosts

The role of higher derivative operators in 4D effective field theories is discussed in both non-supersymmetric and supersymmetric contexts. It is showed that theories with higher derivative operators do not always have an improved UV behaviour as usually considered, due to subtleties related to the analytical continuation from the Minkowski to the Euclidean metric. Radiative corrections in the presence of these operators are carefully considered. In the supersymmetric context of the O'Raifeartaigh model of spontaneous supersymmetry breaking with a higher derivative (supersymmetric) operator, it is found that quadratic divergences are nevertheless present in the one-loop self-energy of the scalar field. Similar conclusions apply to explict soft supersymmetry breaking (Wess-Zumino model) in the presence of these operators. These results depend, however, on the analytical continuation (Minkowski-Euclidean) that one has to make/choose and this is discussed to some detail. In both models, the UV logarithmic behaviour is restored in the decoupling limit of the associated ghosts. Based on arXiv:hep-th/0608094 and additional work in progress.

Speaker: Dr Dumitru Ghilencea (University of Oxford, Physics Dept)

15:40 Reheating Metastable O'Raifeartaigh Models

In theories with multiple vacua, reheating to a temperature greater than the height of a barrier can stimulate transitions from a desirable metastable vacuum to a lower energy state. We discuss the constraints this places on various theories and demonstrate that in a class of supersymmetric models this transition does not occur even for arbitrarily high reheating temperature.

Speaker: Nathaniel Craig (Stanford University)

Slides SUSY_Talk_07:26:07_PDF.pdf SUSY_Talk_07:26:07_PPT.ppt

16:00 → 16:30 coffee break

16:30 → 18:30 Alternatives 2

16:30 Searches for Extra Dimensions and for Heavy Resonances in Dilepton, Diphoton, Electron + Photon and Electron + Missing ET Final States with the D0 Detector

The high-mass spectrum of lepton and photon pairs is sensitive to a broad array of new physics. Examples are searches for extra dimensions in different models in the dielectron, dimuon, and diphoton channels, and Z´ bosons with Standard-Model-like couplings to fermions as well as in a variety of GUT- inspired models. A direct search for electron compositeness is possible in the production of excited electrons decaying into electron and photon. In addition, the electro (or muon) plus missing ET data sample can be searched for a W´ boson. We report on the latest results in searches in the high mass dielectron, dimuon, diphoton, electron plus photon, and electron plus missing ET channels obtained by the D0 experiment at the Tevatron, using a data set corresponding to an integrated luminosity of about 1 fb^-1, and in most cases substantially exceeding the reach of previous searches.

Speaker: Carsten Magass (RWTH Aachen)

Paper Proceedings_Magass_SUSY07.pdf

Slides Magass_SUSY2007.pdf

16:50 Precision constraints on warped scenarios with custodial protection

Randall-Sundrum scenarios offer a well-motivated alternative to supersymmetry as a solution to the hierarchy problem. In addition, bulk fermions allow for an interesting geometrical origin of the observed flavor hierarchies, as well as a natural suppression of neutral flavor changing effects. Recent progress has allowed to control potentially large contributions to the electroweak precision observables, and therefore lower the bounds on the new physics. I present the results of a global fit to the electroweak data in representative examples. Interestingly, loop effects select regions of parameter space with relatively light Kaluza-Klein resonances that can lead to an interesting phenomenology at the LHC.

Speaker: Eduardo Ponton (Columbia University)

Slides Ponton_SUSY07.pdf

17:10 New Tests for Sub-Gravitational Forces at Short Distances

Many theories beyond the Standard Model predict new particles that can mediate sub-gravitational strength forces at short distances. Recent advances in atom interferometry will allow a new round of experiments searching for sub- gravitational strength forces in the 1 micron to 100 meter length scales. I will describe the experiments and prospects for future improvements.

Speaker: Prof. Jacob Wacker (SLAC)

Slides WackerSusy2007.pdf.pdf

17:30 Sensitivity of the LHC Experiments to Extra Dimensions

In the late nineties several authors suggested that the extra dimensions predicted by string theory might lead to observable effects at high energy colliders. The ATLAS experiment which will start taking data at the LHC in 2007 will be an excellent place to search for such effects. A large set of models within the ADD or the Randall Sundrum geometries has been studied in ATLAS. These models predict a variety of signatures: jets and missing energy from direct graviton production, high mass tails in dilepton and diphoton production due to virtual graviton exchange, production of Kaluza-Klein excitations of standard model particles, etc. The sensitivity of ATLAS to these signatures will be presented.

Speaker: Tracey Berry (Royal Holloway - University of London)

Paper berrySUSY07.pdf

Slides BerryEDSUSY07.pdf BerryEDSUSY07.ppt

17:50 Gravitational Fixed Points and Virtual-Graviton Signals at LHC

LHC searches for extra-dimensional graviton signals suffer from a general problem: in addition to the fundamental Planck scale we have to introduce a cutoff (roughly of the order of the Planck scale) to compute collider effects. A slight misalignment between the Planck scale and this cutoff has huge effects for example on virtual-graviton observables. Starting completely generally from an ultraviolet fixed point as a minimal assumption on the theory of quantum gravity we show that the change in the anomalous dimension of the graviton propagator naturally regularizes LHC cross sections without any ad-hoc cutoff procedure. We quantify the effects of such a description on the rates and uncertainties for virtual-graviton signals at the LHC.

Speaker: Tilman Plehn (University of Edinburgh)

Paper http://arxiv.org/pdf/0710.3096

Slides susy_07.pdf

18:10 Searches for New Physics in the Top Quark Samples at CDF

Twelve years after the discovery of the Top Quark at Fermilab's Tevatron, we are now finally beginning to shed light on this peculiarly massive quark. With the large datasets from CDF, we are able to probe the Standard Model top quark, and to search for signals of physics beyond the Standard Model. We present results of measurements of top quark properties, such as the charge of the top quark, top production mechanisms, the V-A nature of the couplings. We also search for flavor changing neutral currents in top decays, top decaying to charged higgs, a massive resonant state decaying to top quark pairs, and a new heavy top-like quark decaying to Wq.

Speaker: Susana Cabrera Urban (Instituto de Fisica Corpuscular (IFIC) UV-CSIC)

Paper 0709.2264.pdf

Slides SUSY07CDFTOP-CORR.pdf SUSY07CDFTOP-CORR.ppt

16:30 → 18:30 Colliders - Higgs Phenomenology 2 (Theory)

16:30 Heavy MSSM Higgs bosons at the LHC

We present new phenomenological analysis for the discovery of the heavy neutral MSSM Higgs bosons at the LHC. We analyze the search reach of the CMS experiment for the heavy neutral MSSM Higgs bosons with an integrated luminosity of 30 or 60 fb^-1. This is done by combining the latest results for the CMS experimental sensitivities based on full simulation studies with state-of-the-art theoretical predictions of MSSM Higgs-boson properties. This includes the the variation of the 5 sigma discovery contours in the MA-tan_beta plane with the variation of the SUSY parameters, as well as the precision that can be achieved for a measurement of the heavy neutral Higgs boson masses. It could be possible in favourable regions of the MSSM parameter space to experimentally resolve the signals of the two heavy MSSM Higgs bosons at the LHC. We furthermore present results for the discovery reach in diffractive Higgs production at the LHC. This will allow to probe interesting regions of the $\MA$--$\tb$ parameter plane of the MSSM with the Higgs bosons decaying to b \bar b.

Speaker: Dr Sven Heinemeyer (IFCA, Santander)

Paper sven_heinemeyer_CMSHiggs.pdf

Slides SvenHA.pdf.pdf

16:50 MSSM Higgs-boson production in bottom-quark fusion: electroweak radiative corrections

Higgs-boson production in association with bottom quarks is an important discovery channel for supersymmetric Higgs particles at hadron colliders for large values of $\tan\beta$. We present the complete order $\alpha$ electroweak and order $\alpha_s$ strong corrections to Higgs production through bottom fusion in the MSSM and improve this next-to-leading-order prediction by known two-loop contributions to the Higgs self-energies, as provided by the program FeynHiggs. Choosing proper renormalization and input-parameter schemes, the bulk of the corrections (in particular the leading terms for large $\tan\beta)$ can be absorbed into an improved Born approximation. The remaining non-universal corrections are typically of the order of a few per cent. Numerical results are discussed for several benchmark scenarios like SPS 1b and SPS 4.

Speaker: Dr Alexander Muck (RWTH Aachen)

Paper 0710.2409.pdf

Slides talk_muck.pdf.pdf

17:10 Discovering the Higgs Bosons with Tau Leptons and a Bottom Quark

We investigate the prospects for the discovery at the CERN Large Hadron Collider of a neutral Higgs boson produced with one bottom quark followed by Higgs decay into a pair of tau leptons. We work within the framework of the minimal supersymmetric model. The dominant physics background from the production of $b\tau^+\tau^-$, $j\tau^+\tau^-$ ($j = g, u, d, s, c$), $b\bar{b}W^+W^-$, $W+2j$ and $b\bar{b}g$ is calculated with realistic acceptance cuts and efficiencies. Promising results are found for the CP-odd pseudoscalar ($A^0$) and the heavier CP-even scalar ($H^0$) Higgs bosons with masses up to 1 TeV.

Speaker: Prof. Chung Kao (University of Oklahoma)

Slides Kao_SUSY07.pdf

17:30 Associated charged Higgs and W boson production in the MSSM at the CERN Large Hadron Collider

We investigate the viability of observing charged Higgs bosons (H^+) produced in association with W bosons at the CERN Large Hadron Collider, using the leptonic decay H^+ -> tau^+ nu_tau and hadronic W-decay, within different scenarios of the Minimal Supersymmetric Standard Model (MSSM) with both real and complex parameters. Performing a parton level study we show how the irreducible Standard Model background from W + 2 jets can be controlled by applying appropriate cuts and find that the size of a possible signal depends on the cuts needed to suppress QCD backgrounds and misidentifications. In the standard maximal mixing scenario of the MSSM we find a viable signal for large tan beta and intermediate H^+ masses (~ m_t) when using optimistic cuts whereas for more pessimistic ones we only find a viable signal for very large tan beta (> 50). We have also investigated a special class of MSSM scenarios with large mass-splittings among the heavy Higgs bosons where the cross-section can be resonantly enhanced by factors up to one hundred, with a strong dependence on the CP-violating phases. Even so we find that the signal after cuts remains small except for small masses (<= m_t) with optimistic cuts. Finally, in all the scenarios we have investigated we have only found small CP-asymmetries.

Speaker: Dr Stefan Hesselbach (University of Southampton)

Paper stefan_hesselbach_susy07.pdf

Slides Hesselbach_HW.pdf

17:50 Charged Higgs production at the LHC in minimal flavor violation and beyond

The discovery of a charged-Higgs-boson would be a clear signal for physics beyond the Standard Model. In the usual LHC channels we only have realistic chances for such a discovery if the bottom-Yukawa coupling is enhanced. Supersymmetric flavor physics in general predicts squark mixing which can significantly change the pattern of charged-Higgs production and circumvent the chiral suppression for single Higgs production. The most severe constraints to these squark mixing parameters come from B physics. We evaluate the discovery potential of charged Higgs production in the light of supersymmetric flavor physics, in the single-Higgs production channel and in association with a hard jet.

Speaker: Michael Spannowsky (LMU)

Paper 07104038.pdf

Slides msp_susy07.pdf

18:10 Decay of Charged Higgs boson in TeV scale supersymmetric seesaw model

In some class of supersymmetric models, the right-handed neutrino mass is given as a consequence of the supersymmetry (SUSY) breaking and its scale could be as low as TeV scale due to the Giudice-Masiero mechanism. A phenomenologically interesting feature of this scenario is an enhancement of a scalar trilinear interaction of Higgs- slepton-(right-handed) sneutrino. We study some phenomenological aspects of this scenario focusing on the scalar trilinear interaction. We show that the 1-loop correction by sneutrino exchange to the lightest Higgs boson mass destructively interferes with top-stop contributions in the minimal SUSY Standard Model. We find that a decay of charged Higgs boson into sneutrino and charged slepton is sizably enhanced and hence it gives rise to a distinctive signal at future collider experiments in some parameter space.

Speaker: Dr Satoru Kaneko (IFIC, Valencia Univ.)

Paper http://arxiv.org/pdf/0710.2214

16:30 → 18:30 Colliders - Susy Phenomenology 2 (Experiment)

Chairperson: Dirk ZERWAS

16:30 Inclusive Search for Squark/Gluino Production at CDF

We present preliminary results on search for squarks and gluinos in proton-antiproton collisions at sqrt{s} = 1.96 TeV at Tevatron, based on 1.1 fb-1 of data collected by the CDF experiment in Run II. The search is performed on events with multiple jets and large missing transverse energy in the final state, within the framework of the Minimal Supersymmetric Standard Model and assuming that the R-parity is conserved. The measurement is compared to the Standard Model predictions and limits on the gluino and squark masses are extracted.

Speaker: Monica D'Onofrio (Instituto de Fisica de Altas Energias (IFAE))

Paper Monica_Donofrio_susy07_0710-2.5114.pdf

Slides SUSY_DOnofrio.ppt.pdf SUSY_DOnofrio.ppt.ppt

16:50 Searches for squarks and gluinos in Jets+Missing Transverse Energy Final states with the D0 Detector

Searches in the framework of R-parity conserving supergravity inspired models have been performed in data collected by the D\O\ detector at Tevatron $p\bar {p}$ collider at a center-of-mass energy of $\sqrt{s} = 1.96$~TeV. Topologies analyzed consist of acoplanar-jets and multijets events with large missing transverse energy in the final state. In the first search, generic squarks and gluinos productions were investigated in 1~fb$^{-1}$ of data. The data show good agreement with the standard model expectations and improved mass limits have been derived. Lower limits of 375~GeV and 289~GeV were derived at 95\% C.L on the squarks and gluino masses, respectively, with $\tan \beta = 3$, $A_0 = 0$ and $\mu < 0$. Previous limits obtained by D\O\ collaboration are improved by about 50~GeV. Supergravity inspired models suggest the existence of light supersymmetric partners of the third generation quarks: a light stop for moderate values of $\tan\beta$, a light sbottom for large $\tan\beta$. If the stop or sbottom is the next-to-lightest supersymmetric particle, the expected decay channels are $\tilde{t}\to c \tilde{\chi}^0_1$ and $\tilde{b}\to b\tilde{\chi}^0_1$, respectively, with $\tilde{\chi}^0_1$ assumed to be the lightest supersymmetric particle. Pair production of stops or sbottoms will therefore lead to the signature of two acoplanar heavy flavor jets and missing transverse energy. The searches for such final states are performed, improving significantly upon the results from Run I of the Tevatron.

Speaker: Mansoora Shamim (Kansas State University)

Paper susy07_proceedings.pdf

Proceedings 0710.2897v1.pdf

Slides SUSY07_v2.pdf

17:10 SUSY Searches in all-hadronic states with large MET at the LHC

The CMS search strategy for SUSY in inclusive multijet plus high missing transverse energy final states is reviewed. This canonical SUSY signature may be a viable discovery channel for low mass SUSY in the early phase of the LHC. Methods for direct normalization of Standard Model background estimates to the data, MET studies and filters for instrumental background will be presented.

Speaker: Michael Tytgat

Paper 0710.pdf

Slides mtytgat_susy07.pdf

17:30 SUSY sensitivity in final states with leptons jets and MET at the LHC

Preparations are underway to search for possible signatures of Supersymmetry (SUSY) in the inclusive leptons plus jets and missing transverse energy (MET) as well as semi-inclusive topologies involving same-sign dimuon final states, using the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider, which are entering the final phases of construction and initial phases of commissioning. This talk reports on the expected performance of CMS, using a full simulation of the detector, and studies its effect on the SUSY discovery reach during early running at the LHC. The primary background sources to SUSY are expected to arise from QCD multijets, top anti-top, and W/Z production. Strategies for reducing and calibrating this background, both from the online CMS trigger and from offline data analysis, as well as understanding and controlling systematic uncertainties, are presented.

Speaker: Massimiliano Chiorboli (Universita\)

Paper 0710-2.4787.pdf

Slides susy2007.ppt

17:50 Strategy for early SUSY searches at the LHC

We review the strategy for searching for R-parity conserving SUSY particles at the LHC. Results are focused on the early stage of collisions, and on the techniques for understanding the detector performance and estimating Standard Model backgrounds using first data. The measurement of kinematic quantities in the background region is used to estimate the total background in the kinematic region where a SUSY signal is expected. The significance of SUSY discovery for 10fb-1 is presented for the mSUGRA model by performing a grid scan on m1/2, m0, A, tanB and sgnmu.

Speaker: Shimpei Yamamoto

Paper 0710.3953v1.pdf

Slides Strategy_for_early_SUSY_searches_at_ATLAS.pdf Strategy_for_early_SUSY_searches_at_ATLAS.ppt

18:10 Trigger strategy for SUSY searches at the LHC

A trigger strategy to be used for SUSY searches at the LHC is presented. We focus our attention on jets+missing ET triggers, but also investigate how other triggers can be used to effectively trigger SUSY events.

Speaker: Antonella De Santo (Physics Department)

Paper 0710.4161v1.pdf

Slides ADS_SUSY07.pdf ADS_SUSY07.ppt

16:30 → 18:30 Cosmology 2

16:30 Indirect searches for Dark Matter with AMS02

AMS02 is a multi-purpose spectrometer with superconducting magnet, designed for 3 years of data taking abroad the International Space Station. Its high performance regarding particle identification and energy measurement will allow performing indirect searches for dark matter (DM) in different channel simultaneously: gamma rays, positrons, antiprotons and hopefully antideuterons. A new spectrum generator, based on the public package micrOMEGAs is being developed for the computation of those signals. It includes cross section computations, dark halo modelling and charged particles Galactic propagation handle. This tool is presented, together with a novel method for the quantitative prediction of boost factors. These are expected to be caused by DM substructures, a specific class of which is considered. We show that DM spike formation around intermediate mass black holes can lead to dramatic enhancement of the signals. These studies allow to determine the AMS02 sensitivity to new physics, which is eventually presented.

Speaker: Dr Pierre Brun (Laboratoire d'Annecy-le-Vieux de Physique des Particules (LAPP))

Paper 0710.2458v1.pdf

Slides brun_susy07.pdf

16:50 The dark connection between the Canis Major dwarf, the Monoceros ring, the gas flaring, the rotation curve and the EGRET excess of diffuse Galactic Gamma Rays

The excess of diffuse galactic gamma rays above 1 GeV, as observed by the EGRET telescope on the NASA Compton Gamma Ray Observatory, shows all the key features from Dark Matter (DM) annihilation: 1) the energy spectrum of the excess is the same in all sky directions and is consistent with the gamma rays expected for the annihilation of WIMPs with a mass between 50-100 GeV; 2) the intensity distribution of the excess in the sky is used to determine the halo profile, which was found to correspond to the usual profile from N-body simulations with additional substructure in the form of two doughnut-shaped structures at radii of 4 and 13 kpc; 3) recent N-body similations of the tidal disruption of the Canis Major dwarf galaxy show that it is a perfect progenitor of the ringlike Monoceros tidal stream of stars at 13 kpc with ring parameters in perfect agreement of the EGRET data; 4) the mass of the outer ring is so large, that its gravitational effects influence both the gas flaring and the rotation curve of the Milky Way. Both effects are clearly observed in agreement with the DMA interpretation of the EGRET excess.

Speaker: Prof. Wim De Boer (Institut fuer Experimentelle Kernphysik)

Paper Deboer_archive_susy07.pdf

Slides SUSY07_parallel_short.pdf

17:10 Supersymmetric Interpretation of the EGRET excess in diffuse Galactic gamma rays

Recently it was shown that the excess of diffuse Galactic gamma rays above 1 GeV could be interpreted as a Dark Matter annihilation signal. From the spectral shape of the excess it is possible to determine a range for the allowed WIMP mass which can be used to test the supersymmetric parameter space. It is found that the EGRET excess combined with electroweak and other constraints, e.g. relic denisity or direct detection limits, is fully consistent with the minimal mSUGRA model for scalars in the TeV range and gauginos below 500 GeV.

Speaker: Dr Christian Sander (Univ. Hamburg)

Paper http://arxiv.org/pdf/0710.4439

Slides sander.pdf

17:30 Determination of the Dark Matter profile from the EGRET excess of diffuse Galactic gamma rays

The excess above 1 GeV in the energy spectrum of the diffuse galactic gamma radiation, measured with the EGRET experiment, can be interpreted as the annihilation of dark matter (DM) particles. The DM is distributed in a halo around the Milky Way. From the directionality of the gamma ray excess it is possible to determine the halo profile. A comparison is made between the theoretical preferred NFW profile with a DM cusp in the centre and a cored isothermal profile without cusp.

Speaker: Mr Markus Weber (Institut fuer Experimentelle Kernphysik - Universitaet Karlsruhe)

Paper Weber_susy07.pdf

Slides SUSY07.pdf

17:50 Uncertainties of the antiproton flux from dark matter annihilation in comparison with the EGRET excess of diffuse gamma rays

The EGRET excess of diffuse Galactic gamma rays shows all the features expected from dark matter annihilation (DMA): a spectral shape given by the fragmentation of mono-energetic quarks, which is the same in all sky directions and an intensity distribution of the excess expected from a standard dark matter halo, predicted by the rotation curve. From the EGRET excess one can predict the flux of antiprotons from DMA. However, how many antiprotons arrive at the detector depends strongly on the propagation model. The simplest isotropic propagation models trap the anitprotons in the Galaxy, which leads to a local anitproton flux far above the observed flux. According to Bergstrom et al. this excludes the DMA interpretation of the EGRET excess. Here it is shown that more realistic anisotropic propagation models, in which most antiprotons escape by convection, are consistent with the B/C ratio, the antiproton flux and the EGRET excess from DMA.

Speaker: Iris Gebauer (Universitaet Karlsruhe)

Paper 0710.4966

Slides SUSY07.pdf

18:10 The anomaly in the cosmic ray positron spectrum

A recent analysis of cosmic ray data from a space borne experiment by the AMS collaboration confirms the excess in the cosmic ray positron spectrum observed by previous balloon experiments. The combination of the various experimental data establishes a deviation from the expected background with a significance of more than four standard deviations. The observed change in the spectral index cannot be explained without introducing a new source of positrons. If interpreted within the MSSM a consistent description of the antiproton spectrum, the diffuse gamma-ray flux and the positron fraction is obtained which is compatible with all other experimental data, including recent WMAP data. Constraints in the tan beta - M(neutralino) plane will be presented. Perspectives to observe the expected SUSY signatures at LHC, at direct detection experiments like XENON and at indirect detection experiments like PAMELA, AMS or PEBS will be discussed.

Speaker: Dr Jan Olzem (I. Physikalisches Institut B, RWTH Aachen)

Paper susy07_olzem_arxiv0710.2428.pdf

Slides olzem_susy07.pdf.pdf

16:30 → 18:30 Theoretical Models (String Theory and Formal Aspects of SUSY) 2

16:30 See-saw neutrinos from string theory

We study the possibility of realizing the neutrino seesaw mechanism in the $\E8\times \E8$ heterotic string. In particular, we consider its $\Z6$ orbifold compactifications leading to the supersymmetric standard model gauge group and matter content. We find that these models possess all the necessary ingredients for the seesaw mechanism, including the required Dirac Yukawa couplings and large Majorana mass terms. We argue that this situation is quite common in heterotic orbifolds. In contrast to the conventional seesaw of grand unified theories (GUTs), no large GUT representations are needed to generate the Majorana mass terms.

Speaker: Oleg Lebedev (Unknown)

Slides NuFromString.pdf

16:50 Exploring the landscape - statistics of string theory vacua

Recent progress in the statistical analysis of string theory vacua is summarised. In particular the classification of compactifications in type II orientifolds using intersecting brane constructions on different orbifold backgrounds is discussed. Results of this analysis include frequency distributions of gauge groups and chiral matter. Special attention is payed to models that contain the gauge group and the chiral matter of the MSSM.

Speaker: Dr Florian Gmeiner (NIKHEF)

Paper 0710.2468.pdf

Slides talk.pdf

17:10 SUSY Multi-Step Unification without Doublet-Triplet Splitting

Matter-Higgs unification in string-inspired supersymmetric Grand Unified Theories predicts the existence of colored states in the Higgs multiplets and calls for two extra generations of Higgs-like fields ('unhiggses'). If these states are present near the TeV scale, gauge-coupling unification points to the existence of two distinct scales, 10^15 GeV where right-handed neutrinos and a Pati-Salam symmetry appear, and 10^18 GeV where complete unification is achieved. Baryon-number conservation, while not guaranteed, can naturally emerge from an underlying flavor symmetry. Collider signatures and dark-matter physics may be drastically different from the conventional MSSM.

Speaker: Prof. Juergen Reuter (University of Freiburg)

Paper http://arxiv.org/pdf/0709.4202

Slides reuter_multistep.pdf.pdf

17:30 Gauge coupling unification and Light Exotica in String Theory

In this letter we consider the consequences for the LHC of light vector-like exotica with fractional electric charge. It is shown that such states are found in orbifold constructions of the heterotic string. Moreover, these exotica are consistent with gauge coupling unification at one loop, even though they do not come in complete multiplets of SU(5). (Talk based on arXiv:0705.0294 [hep-ph])

Speaker: Dr Akin Wingerter (Ohio State University)

Paper http://arxiv.org/pdf/0710.4924

Slides talk_wingerter_susy07.pdf

17:50 Local SU(5) Unification in 6D from the Heterotic String

We present an orbifold compactification of the heterotic string which leads to a six-dimensional supergravity theory with the MSSM as the low-energy limit. Bulk and localised anomalies are cancelled by the Green-Schwarz mechanism. The model contains two pairs of inequivalent fixed points with gauge symmetries SU(5) and SU(2)xSU(4). The SU(5) fixed points contain one standard model generation each, while the third generation arises from bulk split multiplets, and the top Yukawa coupling is given by the six-dimensional gauge coupling. The model exhibits six-dimensional gauge-Higgs unification. All exotics are vector-like and can be consistently decoupled.

Speaker: Dr Christoph Lüdeling (ITP, Uni Heidelberg)

Paper luedeling_proceedings.pdf.pdf

Slides luedeling-susy07.pdf

18:10 GUT-like Superstring Standard Model from the Heterotic String

We construct a supersymmetric standard model in the context of the Z_{12-I} orbifold compactification of the E_8 x E_8' heterotic string theory. The gauge group is SU(3)_c x SU(2)_L x U(1)_Y x U(1)^4 x [SO(10) x U(1)^3]' with sin^2\theta_W^0 = 3/8. We obtain three families of SO(10) spinor-like chiral matter states, and Higgs doublets. All exotic states are exactly vector-like under the standard model gauge symmetry. There are numerous neutral singlets, many of which get VEVs such that only the standard model gauge symmetry survives and desired Yukawa couplings can be generated at lower energies . In particular, all vector-like exotic states achieve superheavy masses and the R-parity can be preserved.

Speaker: Dr Bumseok Kyae (Korea Institute for Advanced Study (KIAS))

Paper http://arxiv.org/PS_cache/arxiv/pdf/0710/0710.4868v1.pdf KYAE.pdf

Slides SUSYKyae.pdf

19:30 → 20:00 Picture of all participants

Picture of all participants in front of the castle

20:00 → 23:00 Welcome Banquet

Click here
for further information.

Friday, 27 July

09:00 → 10:30 Plenary Session

09:00 Status of the LHC

Speaker: Lyn Evans

Slides SUSYJuly2007.pdf SUSYJuly2007.ppt

09:30 SUSY at the LHC (theory)

Speaker: Bhaskar Dutta

Paper dutta_susy07.pdf

Slides susylhc.pdf susylhc.ppt

10:00 Higgs at the LHC (theory)

Speaker: Abdelhak Djouadi

Slides DJOUADI-susy07.pdf

10:30 → 11:00 coffee break

11:00 → 12:30 Plenary Session

11:00 SUSY at the LHC (experimental)

Speaker: Maria Spiropulu

Slides susy07.pdf

11:30 Higgs at the LHC (experimental)

Speaker: Karl Jakobs

Slides SUSY_07_Karlsruhe.ppt

12:00 SM backgrounds to SUSY searches

Speaker: Michelangelo Mangano

Slides Mangano-SUSY07.pdf

14:00 → 16:00 Alternatives 3

14:00 Discovery Potential of LHC for Extended Gauge Symmetries

Many models of physics beyond the standard model are based on extended gauge symmetries and predict the existence of new heavy particles, often at the TeV scale. Such particles include heavy W and Z bosons, doubly charged higgses, heavy majorana neutrinos, leptoquarks and heavy fermions. The discovery potential of the ATLAS experiment, which will start taking data at the LHC in 2007, will be presented.

Speaker: Gernot Krobath (Unknown)

Paper GernotKrobath_Extended_Gauge_Theories.pdf

Slides GernotKrobath_Extended_Gauge_Theoris.pdf

14:20 Little Higgs Model Discrimination at the LHC and ILC

We propose a means to discriminate between the two basic variants of Little Higgs models, the Product Group and Simple Group models, at the next generation of colliders. It relies on a special coupling of light pseudoscalar particles present in Little Higgs models, the pseudo-axions, to the Z and the Higgs boson, which is present only in Simple Group models. We discuss the collider phenomenology of the pseudo-axion in the presence of such a coupling at the LHC, where resonant production and decay of either the Higgs or the pseudo-axion induced by that coupling can be observed for much of parameter space. The full allowed range of parameters, including regions where the observability is limited at the LHC, is covered by a future ILC, where double scalar production would be a golden channel to look for.

Speaker: Prof. Juergen Reuter (University of Freiburg)

Paper http://arxiv.org/pdf/0709.3816

Slides reuter_lhm.pdf.pdf

14:40 LFV in the Littlest Higgs Model with T-Parity: a Clear Distinction from SUSY

Little Higgs models offer an alternative way to the solution of the little hierarchy problem. Particularly interesting is the Littlest Higgs model with T-parity (LHT). We first briefly review earlier LHT calculations of flavour violation in the quark sector. The talk's main attention is paid to the analysis of the impact of the additional particles introduced in the framework of the LHT on a wide array of lepton flavour violating (LFV) decays. These include the decays $\ell_i\rightarrow\ell_j\gamma$, $\tau\rightarrow\ell\pi,\eta,\eta^\prime$, $\mu^-\rightarrow e^-e^+e^-$, the six three body leptonic decays $\tau^-\rightarrow\ell_i^-\ell_j^+\ell_k^-$ and the rate for $\mu-e$ conversion in nuclei. Upper bounds for the LFV decays in question are given. Finally, we point out how parameter independent ratios of branching ratios of LFV decays can be used to distinguish the LHT from SUSY at low energy experiments.

Speaker: Mr Bjoern Duling (Technische Universität München, Physikdepartment)

Paper 0709.4413v2-1.pdf

Slides LFVLHT.pdf

15:00 Topological physics of little higgs bosons

Topological interactions will generally occur in composite Higgs or Little Higgs theories, extra-dimensional gauge theories in which A_5 plays the role of a Higgs boson, and amongst the pNGB's of technicolor. This phenomena arises from the chiral and anomaly structure of the underlying UV completion theory, and/or through chiral delocalization in higher dimensions. These effects are described by a full Wess-Zumino-Witten term involving gauge fields and pNGB's. We give a general discussion of these interactions, some of which may have novel signatures at future colliders, such as the LHC and ILC.

Speaker: Hill Richard (Fermilab)

Paper http://arxiv.org/pdf/0710.5791

Slides susy07.pdf

15:20 One-loop Radiative Corrections to the $\rho$ Parameter

We implement a one-loop analysis of the $\rho$ parameter in the Left Right Twin Higgs model, including the logarithmically enhanced contributions from both fermion and scalar loops. Numerical results show that the one-loop contributions are dominant over the tree level corrections in most regions of parameter space. The experimentally allowed values of $\rho$-parameter divide the allowed parameter space into two regions; less than $670~{\rm GeV}$ and larger than $1100~{\rm GeV}$ roughly, for symmetry breaking scale $f$. Our numerical analysis significantly reduces the parameter space which are favorably accessible to the LHC.

Speaker: Dr Dong-Won Jung (Korea Institute of Advanced Study ( KIAS))

Paper 0710.2589

Slides dwjung-susy07.pdf dwjung-susy07.ppt

15:40 Physics of the pseudo-Goldstone higgs from five dimensions

I will discuss models of electroweak symmetry breaking with the higgs field embedded in a 5D gauge field. I will concentrate on the relation between the 5D geometry and various phenomenological aspects of the model: 1) Electroweak precision observables, 2) Strong WW scattering, 3) Fine-tuning of electroweak breaking.

Speaker: Adam Falkowski (CERN)

Paper http://arxiv.org/pdf/0710.4050

14:00 → 16:00 Colliders - Higgs Phenomenology 3 (Experiment)

14:00 Search for supersymmetric charged Higgs bosons at the Tevatron

Speaker: Gerald Grenier (Institut de Physique Nucleaire de Lyon (IPNL))

Paper 0710.0853v1.pdf

Slides chargedHiggs_susy2007.odp

14:20 Search for single top production at CDF

In proton-antiproton collisions at the Tevatron top quarks are predominantly pair-produced via the strong interaction. However, the standard model of particle physics also predicts the production of single top-quarks via electroweak processes where an off-mass-shell W boson is exchanged either in the s-channel or the t-channel. Once a signal is established the single-top cross section will serve as an input to tests of the unitarity of the CKM mixing matrix. It is a major challenge to distinguish the single top signal from significant backgrounds, mainly W production in association with heavy flavour jets. The CDF collaboration has analyzed a Tevatron Run II dataset corresponding to 1 fb^{-1} of integrated luminosity. Advanced analysis techniques including neural networks, matrix elements and likelihood discriminants are employed to search for the tiny single-top signal. The results of these multivariate searches will be presented. Single-Top analyses are an improtant stepping stone for the Higgs boson search in the WH channel, since the two processes have the same experimental signature. Understanding the background rates and background composition in the W+jets sample using single-top techniques will be a prerequiste for a successful WH analysis. The talk will summarize the lessons learned by the single-top analyses and point to their application in the WH search.

Speaker: Dominic Hirschbuehl (KIT)

Paper susy07_proceed.pdf

Slides talk.pdf

14:40 Discovery potential for the SM Higgs boson in exclusive final states

ATLAS and CMS results.

Speaker: Sandra Horvat (Max-Planck-Institut fur Physik)

Slides SHorvat_SUSY07_270707.pdf

15:10 Discovery potential for the SM Higgs boson in the inclusive search channels

ATLAS and CMS results

Speaker: Mr Alexander Schmidt (Universitaet Karlsruhe, EKP)

Paper http://arxiv.org/pdf/0710.4878

Slides schmidt.pdf

15:40 Search for Neutral Higgs Bosons in MSSM-like topologies

ATLAS and CMS results.

Speaker: Klute Markus (MIT)

Slides susy07-klute-27jul2007.pdf.pdf

14:00 → 16:00 Colliders - Susy Phenomenology 3 (Theory)

Chairperson: Werner POROD

14:00 Electroweak Contributions to Squark Pair Production

We study pair production of first and second generation squarks in pp collisions at the LHC. In addition to the well-known SUSY QCD diagrams, we compute the contributions from the exchange of an electroweak gauge boson or gaugino. The dominant effect is due to the interference between electroweak gaugino and gluino exchange diagrams, and leads to an enhancement of the total cross section that can be larger than that due to NLO QCD corrections.

Speaker: Sascha Bornhauser (University of Bonn)

Paper http://de.arxiv.org/PS_cache/arxiv/pdf/0710/0710.2035v1.pdf

Slides sbornhauser.pdf

14:20 EW Corrections to Pair Production of Top-squarks at the LHC

At hadron colliders, supersymmetric particles are expected to be produced abundantly in pairs via strong interactions. In this context, top-squark is of particular interest as a candidate on the lightest squark within many supersymmetric models. Given the expected experimental precision, detailed theoretical predictions are essential. We present the complete electroweak (EW) corrections to the top-squark pair production cross section within MSSM at LHC energies. We show that even though EW contributions are small for total cross sections, they become sizeable for differential cross section distributions with respect to transverse momentum, $p_T$, and invariant mass, $\sqrt{\hat{s}}$, of the top-squarks for high $p_T$ and high $\sqrt{\hat{s}}$ ranges.

Speaker: Monika Kollar (MPI for physics, Munich)

Paper 0710.2472

Slides mkollar_susy2007.pdf

14:40 One-loop corrections in chargino sector with CPV phases

We present analysis of production and decay of charginos in MSSM at the one-loop level. Radiative corrections in this sector can be of the order of 20%, so they should be taken into account in future experiments. Moreover, there are several effects that can be observed in chargino sector which are only present beyond the leading order. Particular emphasis will be put on the contributions due to CP violating phases of the MSSM.

Speaker: Mr Krzysztof Rolbiecki (Institute of Theoretical Physics, Warsaw University)

Paper 0710.1748v2.pdf

Slides Rolbiecki.pdf

15:00 Transverse-momentum, threshold and joint resummations for slepton-pair production at hadron colliders

We present a first and extensive study of resummation effects for supersymmetric particle production at hadron colliders, focusing on Drell-Yan like slepton-pair and slepton-sneutrino associated production. We jointly treat the recoil corrections at small transverse-momentum and the threshold-enhanced contributions near the partonic threshold, allowing a complete understanding of the soft-gluon effects in differential distributions for slepton-pair production at hadron colliders. We show resummed transverse-momentum and invariant-mass distributions and compare them with the traditional transverse-momentum and threshold resummation formalisms as well as with fixed-order perturbative calculations.

Speaker: Benjamin Fuks (LPSC Grenoble)

Paper 0710.2002v1.pdf

Slides fuks.pdf

15:20 Multiparticle SUSY simulations at LHC & ILC: Off-Shell effects, interferences and radiative corrections

The interesting but difficult phenomenology of supersymmetric models at the LHC & ILC demands a corresponding complexity and maturity from simulation tools. This includes multi-particle final states, reducible and irreducible backgrounds, spin correlations, real emission of photons and gluons, virtual corrections etc. Most of these topics are included in the multi-particle Monte Carlo (MC) Event generators Madgraph, Whizard and Sherpa. A comparison of these codes is shown, with a special focus on the new release of Whizard/O'Mega. I show examples for the necessity of considering full matrix elements with all off-shell effects and interferences for multi-particle final states in supersymmetric models and give a status report on ongoing projects for simulations of SUSY processes at the LHC with these codes, including all of the abovementioned corrections.

Speaker: Prof. Juergen Reuter (University of Freiburg)

Paper http://arxiv.org/pdf/0709.4638

Slides reuter_susyoffshell.pdf.pdf

14:00 → 16:00 Cosmology 3

14:00 A Dark Matter Tool on the Web

Evidences for Dark Matter existence have been increasingly compeling. Current and future direct and indirect searches and results from LHC will provide a wealth of new constraints on the nature of Dark Matter. A web page initiated by the ILIAS network has been set-up to provide the community with a developping tool to evaluate the sensitivities and complementarities of different experiments under different assumptions, theoretical and experimental. The status of this tool will be presented and examples of analysis shown.

Speaker: Dr Rachid LEMRANI (CEA/DAPNIA/SPP)

Slides lemrani_susy07.pdf

14:20 Determining the WIMP Mass from Direct Dark Matter Detection Data

Weakly interacting massive particles (WIMPs) are one of the leading candidates for Dark Matter. Currently, the most promising method to detect many different WIMP candidates is the direct detection of the recoil energy deposited in a low- background laboratory detector due to elastic WIMP-nucleus scattering. So far the usual procedure has been to predict the event rate of direct detection of WIMPs based on some model(s) of the Galactic halo from cosmology and of WIMPs from the elementary particle physics. This can be used to e.g. estimate the mass of halo WIMPs only by fitting the predicted recoil spectra to future experimental data. Now we develop a model-independent method to determine the WIMP mass by directly using experimental data (i.e., the recoil energies) of direct detection. This method is independent of the as yet known WIMP density near the Earth as well as of the WIMP-nuclear cross section. Moreover, according to our simulations, we can already get meaningful information about the WIMP mass from less than one hundred events.

Speaker: Mr Chung-Lin Shan (Physikalisches Inst. der Univ. Bonn)

Paper http://de.arxiv.org/pdf/0710.4296

Slides DM-DD-mchi-SUSY07.pdf

14:40 Status of the EDELWEISS-2 Dark Matter Search

The Edelweiss programme is dedicated to the direct search for Dark Matter as massive weakly interacting particles (WIMPs) with Germanium cryogenic detectors operated in the Laboratoire Souterrain de Modane in the French Alps at a depth of 4800 mwe. After the initial phase Edelweiss I, which involved a total mass of 1 kg, the second step of the programme, Edelweiss II, currently involves 9 kg of detectors and an active shielding of 100m2 muon veto detectors and is now in its commissioning phase. The current status and performance of the Edelweiss II set-up in terms of backgrounds will be given, the underground muon flux measured with the muon veto system will be presented.

Speaker: Ms Astrid Chantelauze (Institut für Kernphysik - Forschungszentrum Karlsruhe)

Paper Chantelauze_susy07.pdf

Slides AChantelauze_EDW2_Status.ppt.ppt

15:00 New results from the XENON10 direct dark matter search

The XENON10 experiment is a search for Weakly Interacting Massive Particles (WIMPs), a leading candidate for the dark matter content of the Universe. The XENON10 detector uses the simultaneous measurement of ionization and scintillation in liquid xenon to distinguish between nuclear recoils and background electronic interactions. Ionization electrons are extracted into the xenon vapor where they produce a large proportional scintillation signal in a grid assembly. Both prompt and proportional scintillation light are detected by PMT arrays on the top and bottom of the active liquid xenon volume. The distribution of proportional scintillation light in the top PMT array can be used to achieve xy position resolution, while the ionization drift time gives position resolution in the z direction. This allows the definition of a low-background fiducial volume. XENON10 was installed in the underground Gran Sasso National Laboratory in Italy in March 2006, and a blind analysis was performed on low-background data acquired between November 2006 and February 2007. I will present the results of that analysis, which has the allowed the most sensitive limit to date on the spin-independent WIMP-nucleon scattering cross-section. I will also describe the current plans for XENON10, as well as future dark matter experiments using the same technology.

Speaker: Prof. Daniel McKinsey (Yale University)

Slides SUSY2007_XENON10.pdf

15:20 LUX: A Large Two-phase Liquid Xenon Detector for WIMP Search

LUX is a new collaboration which has proposed a 100 Kg (fiducial) Liquid Xenon two-phase TPC detector for WIMP search. I will describe the detector, present simulations and comment on the sensitivity that can be achieved. Critical pieces of the detector are under construction and we will have an engineering run (above ground) in the Fall of 2007. The full detector, expected to be the most sensitive at that time, should start operations in an underground lab in mid 2009.

Speaker: Prof. Mani Tripathi (UC Davis)

Slides Tripathi_LUX_SUSY07.pdf

15:40 Systematics and background suppression in the KATRIN experiment

Despite the results of neutrino oscillation experiments providing compelling evidence for non-zero neutrino masses, the absolute mass scale still remains undetermined. This question, which has a strong impact on both particle physics and cosmology, can be addressed in several, complementary ways, either via astrophysical observations or by laboratory experiments. The direct neutrino mass determination relies on a precise measurement of the $\beta$ spectrum (tritium, $^{187}\textrm{Re}$) near its endpoint region. Recent experiments at Mainz and Troitsk using tritium $\beta$ decay have reached their sensitivity potential, yielding upper limits of about $\unit[2]{eV/c^2}$ for $m(\overline{\nu}_e)$. The {\bf KA}rlsruhe {\bf TRI}tium {\bf N}eutrino ex\-peri\-ment (KATRIN), designed to reach a sensitivity of $m(\overline{\nu}_e) = \unit[0.2]{eV/c^2}$ (90\% C.L.), will improve the signal rate by a factor of $> 100$ with respect to previous experiments while maintaining the same low background level at an enhanced energy resolution of 0.93~eV of the spectrometer which is scaled up by a factor of 10 in linear dimensions. This low background rate can only be achieved by active and passive reduction of the background components induced by the spectrometer itself and in the detector region. Furthermore, sources of systematic errors such as energy losses inside the tritium source or fluctuations of the energy scale of the spectrometer need to be carefully controlled and analyzed. An overview of KATRIN`s method to reduce the background rate and to determine the systematics as well as the sensitivity on the neutrino mass will be presented.

Speaker: Kathrin Valerius (Institut für Kernphysik, WWU Münster)

Paper kvalerius-proceeding-susy07.pdf.pdf

Slides kv-susy07-small-v6.pdf

14:00 → 16:00 Flavor Physics 1

14:00 Tau decays at the B-Factories

We present recent results on tau decays using data collected by the BaBar detector at the PEP-II asymmetric-energy e+e- collider at the Stanford Linear Accelerator Center. We report measurements of rates for several hadronic decays and searches for lepton flavor violation.

Speaker: Sanjay Swain

Slides swain.ppt.pdf swain.ppt.ppt

14:20 The muon magnetic moment and supersymmetry

Very impressive recent developments have led to an unprecedented precision in the experimental value and the Standard Model prediction of the muon magnetic moment (g-2). A discrepancy of more than 3 sigma between SM and experiment has now been definitely established! This discrepancy constitutes a strong hint for supersymmetry at the weak scale, and it leads to significant bounds on the supersymmetry parameter space. In the talk the developments leading to the 3 sigma discrepancy are reviewed, and it is shown that this discrepancy can be easily explained by supersymmetry effects but not by virtually any other model of physics beyond the SM. Furthermore, it is shown that the bounds on supersymmetry parameters derived from (g-2) are complementary to information that can be obtained at the LHC.

Speaker: Dr Dominik Stockinger (University Glasgow)

Paper http://arxiv.org/pdf/0710.2429 http://arxiv.org/pdf/0710.2429

14:40 Lepton Universality breaking as a Probe of New Physics

Deviations from the Standard Model (SM) expectations of the Lepton Universality (LU) breaking represent a powerful tool to test the SM and, hence, to probe New Physics (NP) effects. Kaon and pion physics are obvious grounds where to perform such tests, for instance in the pi->l nu and K-> l nu decays, where l= e,mu. Supersymmetric (SUSY) extensions of the SM can exhibit mu-e non-universal contributions at an experimental visible level. We also discuss the LU breaking in B-physics sistems as well as in leptonic tau decays.

Speaker: Paride Paradisi (Universitat of Valencia and IFIC)

Slides paride.pdf

15:00 Lepton Flavour Violation in the SUSY-SeeSaw, an update

We study several Lepton Flavour Violating processes in the context of the SUSY seesaw model with three right handed neutrinos. We estimate rates for l_j-->l_i\gamma, l_j-->3l_i, tau--> mu+hadrons and mu-e conversion in nuclei. We compare these estimates with the present and future experimental bounds.

Speaker: Herrero Maria J. (Universidad Autonoma de Madrid)

Paper http://www.arxiv.org/pdf/0710.4091

Slides SUSY07_herrero.pdf

15:20 Lepton Flavor Violation at the LHC

We study lepton flavor violating processes at the LHC in context of the seesaw mechanism in mSUGRA. The present knowledge in the neutrino sector as well as improved future measurements are taken into account. We investigate the correlations of these processes with the corresponding lepton flavor violating rare decays such as mu->egamma. It is shown that these correlations are relatively weakly affected by uncertainties in the neutrino data, but very sensitive to the mSUGRA parameters.

Speaker: Dr Frank Deppisch (DESY-Hamburg)

Paper http://arxiv.org/PS_cache/arxiv/pdf/0710/0710.2525v1.pdf

Slides frank_deppisch.pdf

15:40 Bounds on R-parity violating supersymmetric couplings from leptonic and semi-leptonic meson decays

We present a comprehensive update of the bounds on $R$--Parity violating supersymmetric couplings from lepton--flavor-- and lepton--number--violating decay processes. We consider ${\tau}$ and ${\mu}$ decays as well as leptonic and semi--leptonic decays of mesons. We present several new bounds resulting from ${\tau}$, ${\eta}$ and Kaon decays and correct some results in the literature concerning $B$ meson decays.

Speaker: Ben O'Leary (RWTH-Aachen)

Slides BOL_SUSY07_Bounds_on_RPV_from_rare_decay_data.pdf

16:00 → 16:30 coffee break

16:30 → 18:30 Alternatives 4

16:30 Is the Higgs boson elementary or composite?

As a way to extend the naturalness domain of the Standard Model, we enlarge the symmetry of the top-Higgs sector to a softly broken SO(5). Depending on its parameters, the model can either be viewed as describing a perturbatively coupled Higgs boson or as the low energy description of a strongly coupled theory at the naturalness cutoff. We perform the ElectroWeak Precision Test (EWPT) analysis, taking into account the important contribution of new fermionic states to the T parameter. To estimate the contribution to the S parameter from the cutoff, and to appreciate the dual role of the model, we also consider the properties of its "holographic" and "deconstructed holographic" extensions. It is unlikely that these attempts at UV completion fare significantly better than the minimal setup with respect to the EWPT and naturalness.

Speaker: Vyacheslav Rychkov (Scuola Normale Superiore)

Slides Rychkov.pdf

16:50 The S-parameter in Holographic Technicolor Models

We study the S parameter, considering especially its sign, in models of electroweak symmetry breaking (EWSB) in extra dimensions, with fermions localized near the UV brane. Such models are conjectured to be dual to 4D strong dynamics triggering EWSB. The motivation for such a study is that a negative value of S can significantly ameliorate the constraints from electroweak precision data on these models, allowing lower mass scales (TeV or below) for the new particles and leading to easier discovery at the LHC. We first extend an earlier proof of S>0 for EWSB by boundary conditions in arbitrary metric to the case of general kinetic functions for the gauge fields or arbitrary kinetic mixing. We then consider EWSB in the bulk by a Higgs VEV showing that S is positive for arbitrary metric and Higgs profile, assuming that the effects from higher-dimensional operators in the 5D theory are sub-leading and can therefore be neglected. For the specific case of AdS_5 with a power law Higgs profile, we also show that S ~ + O(1), including effects of possible kinetic mixing from higher-dimensional operator (of NDA size) in the 5D theory. Therefore, our work strongly suggests that S is positive in calculable models in extra dimensions.

Speaker: Mr Matthew Reece (Cornell University, Laboratory for Elementary Particle Physics)

Slides ReeceSUSY07.pdf

17:10 Minimal Walking Technicolor for Colliders

I will present recent models of dynamical breaking of the electroweak theory, i.e. Minimal Walking Technicolor. I will focus on relevant collider phenomenology.

Speaker: Mads Toudal Frandsen (University of Kopenhagen)

Paper 0710.4333.pdf

Slides mwt_susy07.pdf

17:30 Collider Phenomenology of Higgsless models

We study the LHC signatures of new gauge bosons in the minimal deconstruction Higgsless model with 3 lattice sites (TSM). It predicts an extra pair of W' and Z' bosons which can be as light as 400 GeV while consistent with all existing precision data. We analyze the W' and Z' signals at the LHC including the complete electroweak and QCD backgrounds and that LHC can essentially cover the complete parameter space of the three site model.

Speaker: Dr Alexander Belyaev (Southampton University - Rutherford Lab)

Paper http://arxiv.org/abs/0711.1919 http://arxiv.org/pdf/0711.1919

Slides susy07-3site.pdf

17:50 Electroweak Symmetry Breaking without Higgs Bosons at LHC

While the Brout-Englert-Higgs model of electroweak symmetry breaking is the best studied scenario, a number of alternative models exist, predicting new signatures. The ATLAS experiment will start data taking at the LHC in 2007 and will search for evidence for such models. This includes studies of vector boson scattering and searches for the production of particles predicted in technicolor models. Studies of the sensitivity of the experiment to such models will be presented.

Speaker: Pierre-Antoine Delsart (Physique experimentale des particules)

Slides DelsartSusy07.odp DelsartSusy07.pdf

18:10 Black Holes and ADD gravitons at the LHC

One of the consequences of large extra dimensions is the production of microscopic black holes at LHC energies. If the effective Planck sclae is at the TeV scale the black hole production cross section is in the picobarn range. We present results of a multiobject BH analysis at CMS: for effective Planck scale up to 3 TeV a 5-sigma reach can be obtained with up to 100 pb-1. We also present results for direct graviton emission in the MET+photon final state. summary

Speaker: Sezen Sekmen (Physics Department - Middle East Technical University (METU))

Slides SekmenSUSY07ADDGrBH.pdf SekmenSUSY07ADDGrBH.ppt

16:30 → 18:30 Colliders - Higgs Phenomenology 4 (Theory)

16:30 Higgs boson decays in the Complex MSSM

The analysis of the LEP results showed that, in parts of the MSSM parameter space with non-zero complex phases, it's possible that a Higgs boson could have been as light as 40 GeV and yet still have escaped detection. This region is dominated by the Higgs cascade decay (h2 -> h1 + h1, where h1 is the lightest and h2 is the second lightest neutral Higgs boson respectively). Full 1-loop results for this vertex are presented and combined with 2-loop Higgs propagator corrections from the program FeynHiggs. It is shown that, in this region of parameter space, these new vertex corrections can increase the decay width by a factor of 50.

Speaker: Ms Karina Williams (IPPP, Physics Department, University of Durham)

Paper 0710.5331_KWilliams.pdf.5331

Slides Karina_Williams.pdf

16:50 Higgs production and decay in SUSY with CP violation

In SUSY models with CP violation the production cross sections and decay branching ratios of Higgs bosons may strongly depend on the new CP-violating phases which has to be taken into account in the Higgs search at LHC. In the MSSM with explicit CP violation we analyze the phase dependence of the di-photon decay channel of neutral Higgs bosons, which is an important detection channel for light Higgs bosons at the LHC, at lowest order of the Higgs-sparticle couplings. Complementary to previous studies we focus on SUSY scenarios with low mass sparticle spectrum where the contributions of the sparticles in the loops can have a significant impact on the branching ratio (BR). In some regions of the MSSM parameter space the BR can vary by more than one order of magnitude with the SUSY CP phases. Also in the NMSSM with an additional singlet/singlino superfield, where CP violation results in the mixing of all five neutral Higgs eigenstates, the new CP violating phases can have strong implications on the Higgs phenomenology.

Speaker: Dr Stefan Hesselbach (University of Southampton)

Paper 0710.4923v1.pdf

Slides Hesselbach_CPV_Higgs.pdf

17:10 The Higgs sector in the MSSM with CP-phases at higher orders

Higher order corrections in the MSSM with non-vanishing CP-phases can induce mixing between the CP-even and the CP-odd states. In particular, the lightest Higgs boson is not purely CP-even but receives a CP-odd component. Results are presented for the leading two-loop contributions of O(alpha_t alpha_s) to the masses and mixing effects in the Higgs sector of the MSSM with non-vanishing CP-phases. They are derived in the Feynman-diagrammatic approach using on-shell renormalization.

Speaker: Dr Heidi Rzehak (Paul-Scherrer-Institut, Villigen PSI, Switzerland)

Paper http://arxiv.org/pdf/0710.4891

Slides SUSY07pur.pdf

17:30 Higgs Masses in the Complex MSSM with FeynHiggs

FeynHiggs is a program for the computation of Higgs-boson masses and mixings in the complex MSSM. It also supplies derived information such as Higgs branching ratios and production cross-sections. This talk will review the latest version 2.6 and focus in particular on the implementation of the Higgs mixing in the presence of complex phases.

Speaker: Dr Thomas Hahn (MPI Munich)

Paper http://arxiv.org/pdf/0710.4891

Slides talk.pdf

17:50 Higgs-Boson Phenomenology in the NUHM

We investigate the Higgs phenomenology in the non-universal Higgs model (NUHM). Assuming that the lightest supersymmetric particle (LSP) provides the cold dark matter density preferred by WMAP and other cosmological data, we define MA-tan_beta planes that are also in agreement with electroweak precision observables and B physics observables. Within these planes we analyze the bounds obtained at LEP, the reach of the Tevatron and the LHC, as well as the precisions for various Higgs related observables that can be achieved at the LHC. The compatibility of the model with recent Tevatron measurements is briefly discussed.

Speakers: Dr Georg Weiglein (IPPP, Durham), Dr Sven Heinemeyer (IFCA, Santander)

Paper sven_heinemeyer_EHHOW_susy07.pdf

Slides SvenNUHM.pdf.pdf

18:10 Light MSSM Higgs boson scenario and its test at hadron colliders

In the Minimal Supersymmetric Standard Model, the possibility for the lightest CP-even Higgs boson to be lighter than Z-boson (as low as about 60 GeV) is, contrary to the usual belief, is not yet excluded by LEP2 data or any other existing experimental data. This Light Higgs boson scenario (LHS) is characterized by suppressed ZZh coupling and the decay branching ratio Br(h/A-> bb) as a result of generic supersymmetric loop corrections. Consequently, the (W+ H- h) coupling has to be large due to the sum rule of Higgs couplings to weak gauge bosons. We demonstrate that the associate neutral and charged Higgs boson production process, pp -> H+ h (A), can completely probe LHS at the CERN Large Hadron Collider and discuss additional reactions and potential o B-factories for complementary probe of the Light Higgs Scenario.

Speaker: Dr Alexander Belyaev (Southampton University - Rutherford Lab)

Paper http://arxiv.org/abs/0711.1921 http://arxiv.org/pdf/0711.1921

Slides belyaev_lh_susy07.pdf

16:30 → 18:30 Colliders - Susy Phenomenology 4 (Experiment)

Chairperson: Darin ACOSTA

16:30 Results of searches for Leptoquarks, Isolated Leptons and Multileptons at HERA

Results of searches for Leptoquarks, Isolated Leptons and Multileptons with the H1 and ZEUS experiments in ep collisions at HERA are presented. The analyses use the full statistics of HERA high energy running which ended in March 2007. Combined results of both experiments based on a total integrated luminosity of about 1 fb-1 are also shown.

Speaker: Dr Judith Katzy (DESY, HAMBURG)

Slides

• susy07_katzy.pdf
• susy07_official.pdf
• susy07_official.ppt

17:10 Search for scalar top admixture in the $t\bar{t}\rightarrow\ell+$jets channel with the D0 detector

We report on a search for scalar top quark pair production in the lepton+jets channel. Just like Standard Model top quarks, scalar top quarks are produced in pairs in proton-antiproton collisions. One of the preferred scenarios is for the scalar top to decay to a b-quark and a chargino, with the chargino subsequently decaying into a real or virtual W boson and a neutralino. The neutralino escapes without being detected. Thus, the final state signature can be a lepton, two b-jets, two light quark jets and missing transverse energy, which is identical to the signature of Standard Model $t\bar{t}$ production. We use the kinematic differences between the exotic and the Standard Model scenarios to separate the two.

Speaker: Su-Jung Park (University of Rochester)

Paper 0710.1016.pdf

Slides susy072707.pdf

17:30 Search for the Associated Production of Charginos and Neutralinos with the D0 detector

A search for associated production of charginos and neutralinos is performed using data recorded with the D0 detector at a p-pbar center-of-mass energy of 1.96 TeV at the Fermilab Tevatron Collider. This analysis considers final states with missing transverse energy and three leptons, including hadronic decays of tau leptons. With more than 2fb-1 of data recorded by the D0 experiment, the expected sensitivity reaches well beyond existing limits on the chargino mass, in particular in regions of parameter space with enhanced leptonic branching fractions.

Speaker: Olav Mundal (Bonn University)

Paper mundal_susy07_proceedings.pdf

Slides talk_susy07_MUNDAL.pdf

17:50 Search for Chargino-Neutralino Pairs at CDF

We present the results of a search for associated production of the lightest chargino and next-to-lightest neutralino using 1fb-1 of sqrt s = 1.96 TeV ppbar data collected with the CDF detector at the Tevatron. We combine the results of several multi-lepton final states to set upper limits on the cross section times branching ratio for chargino-neutralino production as a function of the chargino mass.

Speaker: Else Lytken (Conseil Europeen Recherche Nucl. (CERN))

Paper 0710.pdf

Slides lytken_susy07.ppt.pdf lytken_susy07.ppt.ppt

18:10 SUSY searches in trilepton final states at the LHC

he direct production of neutralino-chargino pairs in the mSUGRA scenario with decays to a pure trilepton final state has a significant cross section at low neutralino masses and is a viable SUSY discovery channel at the LHC. The main Standard Model background are from Z/gamma + jets, WZ/gamma and ttbar channels where dileptons appear from Z decays and a third lepton is coming either from W decay or jets. The large total and missing transverse energy of the event used for other SUSY channels is not efficient for the direct production of low mass gauginos thus making isolation and identification of fake leptons a major task for the trilepton signature. We evaluate signal selection criteria using the CMS detector simulation. A 5 sigma signal can be observed in the opposite sign same flavor dilepton invariant mass at an integrated luminosity above 10 fb-1 for m(1/2) < 170 GeV.

Speaker: Martin Niegel (Institut fuer Experimentelle Kernphysik)

Slides TrileptonSUSY07.pdf TrileptonSUSY07.ppt

16:30 → 18:30 Cosmology 4

16:30 Constraints on the very early universe from WIMP dark matter

We investigate the relic density n_\chi of non-relativistic long-lived or stable particles \chi in non-standard cosmological scenarios. We calculate the relic abundance starting from arbitrary initial temperatures of the radiation- dominated epoch, and derive the lower bound on the initial temperature T_0 \geq m_\chi/23, assuming that thermally produced \chi particles account for the dark matter energy density in the universe; this bound holds for all \chi annihilation cross sections. We also investigate cosmological scenarios with modified expansion rate. Even in this case an approximate formula similar to the standard one is capable of predicting the final relic abundance correctly. Choosing the \chi annihilation cross section such that the observed cold dark matter abundance is reproduced in standard cosmology, we constrain possible modifications of the expansion rate at T \sim m_\chi/20, well before Big Bang nucleosynthesis.

Speaker: Dr Mitsuru Kakizaki (Physics Institute, Bonn University)

Slides kakizaki.pdf

16:50 Phenomenology of sub-GUT Supersymmetry Breaking

We study models in which supersymmetry breaking appears at an intermediate scale, M_{in}, below the GUT scale. We assume that the soft supersymmetry-breaking parameters of the MSSM are universal at M_{in}, and study the morphology of the constraints from cosmology and collider experiments on the allowed regions of parameter space as M_{in} is reduced from the GUT scale. We present separate analyses of the (m_{1/2},m_0) planes for tan(beta)=10 and tan(beta)=50, as well as a discussion of non-zero trilinear couplings, A_0. We demand that the lightest neutralino be the LSP, and that the relic neutralino density not conflict with measurements by WMAP and other observations. At moderate values of M_{in}, we find that the allowed regions of the (m_{1/2},m_0) plane are squeezed by the requirements of electroweak symmetry breaking and that the lightest neutralino be the LSP, whereas the constraint on the relic density is less severe. At very low M_{in}, the electroweak vacuum conditions become the dominant constraint, and a secondary source of astrophysical cold dark matter would be necessary to explain the measured relic density for nearly all values of the soft SUSY-breaking parameters and tan(beta).

Speaker: Pearl Sandick (University of Minnesota)

Paper http://arxiv.org/pdf/0710.1843

Slides Sandick.pdf Sandick.ppt

17:10 The Lightest Higgs Boson and Relic Neutralino in the MSSM with CP Violation

We discuss the lower bound to the lightest Higgs boson H_1 in the minimal supersymmetric extension of the standard model with explicit CP violation, and the phenomenology of the lightest relic neutralino in the same scenario. We find that the combination of present experimental constraints favours a region of the parameter space where the mass of H_1 is in the range 7 GeV < M_{H_1} < 10 GeV, while 3 < tan(beta) < 5. Assuming a departure from the usual GUT relation among gaugino masses (|M_1| << |M_2|), we find that through resonant annihilation to H_1 a neutralino as light as 2.9 GeV can be a viable dark matter candidate. We call this the CPX light neutralino scenario, and discuss its prospect of detection both from direct and indirect dark matter searches.

Speaker: Dr Stefano Scopel (Korea Institute of Advanced Study, Seoul)

Paper scopel_susy07_contribution.pdf

Slides scopel.pdf

17:30 SUSY-GUTs, SUSY-Seesaw and the Neutralino Dark Matter

We will consider a SUSY-$SU(5)$ with one right-handed neutrino with a large top like Yukawa coupling. Assuming universal soft masses at high scale we compute the low-energy spectrum and subsequently the neutralino LSP relic density taking also into consideration $SU(5)$ as well as the see-saw running effects above the gauge coupling unification scale. We found that there exists no viable region in parameter space for $\tan\beta~\ler ~35$. The $\tilde{\tau}$ coannihilation process starts becoming efficient for $\tan\beta~\ger~35-40$. However, unlike in mSUGRA, this process is significantly constrained by the limited range in which the stau is lighter than the neutralino. In fact, for a given $\tan\beta$ we find that there exists an upper bound on the lightest neutralino mass ($M_{\chi_1^0}$) in this region. The A-pole funnel region appears at very large $\tan\beta~\sim 45-50$, while the focus-point region does not make an appearance till large ($m_0,M_{1/2})\sim$ a few TeV. Large $A_0$ terms at high scale can lead to extended regions consistent with WMAP constraints and remove the upper bounds in the stau coannihilation regions.

Speaker: Lorenzo Calibbi (Universitat de Valencia)

Paper 0710.1759v1.pdf

Slides lorenzo_calibbi.pdf

17:50 Effect of radiative corrections at order alpha_s to neutralino annihilation processes on the cold dark matter relic density

Supersymmetry (SUSY) is the most economical and best studied possible extension of the Standard Model of particle physics. In particular, the lightest of the four neutralinos is a good candidate for the cold dark matter, which accounts for about 25% of our universe and whose nature remains at present unknown. The possibility to compute the neutralino relic density within a given model and to compare to cosmological data provides an interesting possibility to constrain the SUSY parameter space and to obtain complementary information with respect to collider experiments. As new experiments will deliver more precise cosmological data in a near future, radiative corrections to the neutralino pair annihilation cross section become important within this context. We compute the (SUSY-)QCD corrections contributing to the annihilation cross section and we evaluate their effect on the cross section itself as well as on the neutralino relic density with respect to cosmological constraints. We present an extensive analysis of the (SUSY-)QCD corrections to neutralino pair annihilation processes in different cosmological regions of the mSUGRA parameter space. In a first step, we study the annihilation into a pair b\bar{b} through pseudoscalar Higgs exchange, which dominates in the cosmological "A-funnel" region caracterized by large tan(beta). Our study confirms the importance of radiative corrections, which decrease the annihilation cross section by about 50% for the QCD part, and by up to another 10% for the SUSY-QCD part. In consequence, the neutralino relic density increases, and the "A-funnel" slope agreeing with cosmological data is shifted to smaller SUSY masses. The second step of our project consists of a similar study for neutralino pair annihilation into a quark-antiquark pair through Z-boson or squark exchange, which are the dominant processes in the cosmological "bulk" region. We compute all relevant (SUSY-)QCD corrections and we evaluate their effect on the annihilation cross section and the cosmologically favoured regions of the SUSY parameter space.

Speaker: Mr Björn Herrmann (LPSC Grenoble)

Paper http://arxiv.org/pdf/0709.2232

Slides herrmann_dm.pdf.pdf

18:10 Constraining the mSUGRA parameter space through entropy and abundance criteria

We derive an expression for the entropy of a present dark matter halo described by the Navarro-Frenk-White model and a core. The comparison of this entropy with the one of the halo at the freeze-out era allows us to constrain the parameter space in mSUGRA models, when used with the WMAP observations. Moreover, by joning these results with the ones obtained from the usual abundance criteria, we are able to clearly descriminate validity regions among the tan beta values of the mSUGRA model, by demanding both criteria to be consistent with the 2 sigma bounds of the WMAP observations for the relic density: 0.0945<Omega_CDM h^2<0.1287. As a first result, we found that for A_0=0, and sgn mu=+, small values of tan beta are not favored; only for tan beta ~ 50 are both criteria significantly consistent. We go further and derive the spectra for the rest of the mSUGRA parameters consistent with the cosmological considerations.

Speaker: Prof. Myriam Mondragon (Instituto de Fisica, UNAM, Mexico)

Paper 0710.2336.pdf

Slides mondragon_sugra.pdf.pdf

16:30 → 18:30 Flavor Physics 2

16:30 Radiative and Electroweak penguin decays at the B-Factories

We present recent results on radiative B decays using data collected by the BaBar detector at the PEP-II asymmetric-energy e+e- collider at the Stanford Linear Accelerator Center. We report several measurements among which the inclusive b -> s gamma rate and CP asymmetry and results on b->d gamma decays.

Speaker: Karsten Köneke (MIT)

Paper 0710.4855v2.pdf

Slides Koeneke-SUSY07.pdf Koeneke-SUSY07.ppt

16:50 Leptonic decays at BaBar

We present recent results on leptonic B decays using data collected by the BaBar detector at the PEP-II asymmetric-energy e+e- collider at the Stanford Linear Accelerator Center. We report several measurements among which searches for the B -> tau nu and other B-> ll final states.

Speaker: Guglielmo De Nardo (INFN Sezione di Napoli)

Paper denardo_0710_5332.pdf.5332

Slides denardo.pdf denardo.pdf

17:10 Studies of B decays with missing energy at Belle

We report the results of studies of $B$ decays with misiing energy due to > two or more neutrinos such as $B\to \tau \nu$, $B\to D^{(*)}\tau\nu$ and > $B \to h^(*) \nu \bar\nu$. The analysis uses a large data sample collected > at the $\Upsilon(4S)$~resonance with the Belle detector at the KEKB > asymmetric energy $e^+e^-$~collider.

Speaker: Maria Rozanska (Krakow)

Slides susy07_rozanska.pdf

17:30 CP violation in b->s penguin decays at BaBar

We present recent measurements of CP violation in b->s penguin decays using data collected by the BaBar detector at the PEP-II asymmetric-energy e+e- collider at the Stanford Linear Accelerator Center. We present several measurements among which sin2beta from B->Kspi0, B->pi0pi0Ks and B->KsKsK0 decays.

Speaker: NITESH SONI (University of Birmingham (UK))

Paper nitesh-susy07.pdf

Slides soni.pdf

17:50 Studies of penguin dominated B decays at Belle

We present measurements on penguin dominated $B$ decays which are sensitive to new physics, such as $CP$-violation parameters and branching fractions in $b \to s q\bar{q}$ and $b \to d q\bar{q}$ gluonic and radiative decays using a large sample of $B\bar{B}$ pairs recorded at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider.

Speaker: Yosuke Yusa (Virginia Polytechnic Inst. and State Univ.)

Paper http://arxiv.org/pdf/0710.4380

Slides SUSY07Belleb2s.pdf

18:10 Branching Fractions and Direct CP Asymmetries of Charmless B Decay Modes at the Tevatron

We present new CDF results on the branching fractions and time-integrated direct CP asymmetries for B0 and B0(s) decay modes into pairs of charmless charged hadrons (pions or kaons). The data-set for this update amounts to fb-1 of p anti-p collisions at a center of mass energy 1.96 TeV. We report the first observation of the B0(s) --> K- pi++ mode and a measurement of its branching fraction an direct CP asymmetry. We also observe for the first time two charmless decays of the Lambda_b-baryon: Lambda0(b) --> p pi+- and Lambda0(b) --> pK-.

Speaker: Dr Michal Kreps (Karlsruhe)

Paper 0709.4555.pdf

Slides kreps_susy2007.pdf.pdf

20:00 → 22:00 Public Lecture: The Qantum and the Cosmos - Edward KOLB

Long before the emergence of planets, stars, or
galaxies, the universe consisted of an exploding
quantum soup of "elementary" particles.
Encoded in this formless, shapeless soup were
seeds of cosmic structure, which over billions
of years grew into the beautiful and complex
universe we observe today.
The lecture will explore the connection between
the "inner space" of the quantum and the
"outer space" of the cosmos. The inner
space/outer space connection may hold the
key to the nature of the dark matter holding
together our galaxy and the mysterious dark
energy pulling apart our universe

Saturday, 28 July

09:00 → 10:30 Plenary Session

09:00 Direct searches for Higgs and Beyond the SM at the Tevatron

Speaker: Arnaud Duperrin

Paper 0710.4265v1.pdf

Slides SUSY07_A-Duperrin_talk.pdf SUSY07_A-Duperrin_talk.pdf

09:30 Electroweak and top physics at the Tevatron and indirect Higgs limits

Speaker: Sandra Leone

Paper 0710.4983_v3.pdf

Slides Tevatron_ewk_final.pdf Tevatron_ewk_final.ppt

10:00 Search for TeV scale physics in heavy flavour decays

Speaker: George Hou

Paper GeorgeHou_susy07.pdf

Slides FlavorTeV.pdf FlavorTeV.ppt

10:30 → 11:00 coffee break

11:00 → 12:30 Plenary Session

11:00 SUSY beyond minimal flavour violation

Speaker: Sebastian Jäger

Paper 0710.5206.pdf

Slides susy07_jaeger.pdf

11:30 SM predictions for Heavy Flavour Physics

Speaker: Andrzej Czarnecki

Slides CzarneckiSUSY.pdf

12:00 Large tanbeta Effects in Flavour Physics

Speaker: Gino Isidori

Paper isidori_susy07.pdf

Slides IsidoriSUSY07.pdf

14:00 → 16:00 Colliders - Higgs Phenomenology 5 (Experiment)

14:00 Search for Charged Higgs bosons at the LHC

ATLAS and CMS results.

Speaker: Martin Flechl (IKP, Uppsala Universitet)

Paper MartinFlechl_SearchForChargedHiggsBosons_SUSY07Paper.pdf

Slides MartinFlechl_ChargedHiggs_SUSY07.pdf

14:20 Search for Higgs Bosons in Non-Minimal models

ATLAS and CMS results.

Speaker: Nancy Marinelli (Univ. of Notre Dame)

Paper http://arxiv.org/PS_cache/arxiv/pdf/0709/0709.2335v1.pdf

Slides

• NancyMarinelli.pdf
• NancyMarinelli.ppt
• NancyMarinelli.ppt.pdf

14:40 Determination of the discovery potential for Higgs bosons in the MSSM

ATLAS and CMS results

Speaker: Dorian Kcira (Universite Catholique de Louvain)

Paper 0710.1957v1.pdf

Slides 2007_07_28_SUSY07_MSSMHiggs.pdf

15:00 Determination of Higgs bosons properties at LHC

ATLAS and CMS results.

Speaker: Christoph Ruwiedel (Rheinische Friedrich-Wilhelms Universitaet Bonn)

Paper susy07_higgs_properties.pdf

Slides Ruwiedel_susy07_higgs_properties.pdf

15:20 Double Parton Scattering in Associate Higgs Boson Production with Bottom Quarks at Hadron Colliders

Higgs boson production in association with bottom quarks, is one of the most important channels for Higgs particles in the Standard Model (SM) and its supersymmetric extension at the LHC pp collider . The theoretical prediction of the corresponding cross section has been improved by including the complete next-to-leading order QCD corrections. We review the status results for the leading order to the partonic process and present calculations for the integrated cross-section in both single and double parton scattering collisions. At very high energies both single and the double parton scatterings contribute to the process, the later mechanisms, although power suppressed, giving the sizable contribution to the integrated cross section.

Speaker: Dr Mohammad Hussein (Dept. of Physics, University of Bahrain)

Paper http://arxiv.org/pdf/0710.0203

Slides

• hussein_higgs.pdf
• hussein_higgs.ppt
• hussein_higgs.ppt.pdf

15:40 Distributions for Higgs + jet at hadron colliders: MSSM versus SM

We present pseudorapidity and transverse momentum distributions for the cross section for the production of the lightest neutral Higgs boson in association with a high-p_T hadronic jet, calculated in the framework of the minimal supersymmetric standard model. We discuss the theoretical predictions for the differential cross sections at the Large Hadron Collider and the Tevatron for the most common benchmark scenarios. In particular, we investigate the differences in the distributions

Speaker: Dr Oliver Brein (IPPP, Durham)

Paper http://arxiv.org/abs/0710.4781

Slides Brein.pdf

14:00 → 16:00 Colliders - Susy Phenomenology 5 (Theory)

Chairperson: Dirk ZERWAS

14:00 NLO Event Generation for Chargino Production at the ILC

In the Chargino-/ Neutralinosector of the MSSM, the electroweak SUSY parameters can be determined by a small number of measurements of masses and cross sections. NLO corrections to these observables are in the percent regime, thereby matching the size of experimental fitting accuracies for joint LHC/ ILC analyses. We therefore include the NLO result for Chargino at the ILC production in the Monte Carlo Event Generator Whizard. In a fixed NLO approach, the event generation suffers from negatve event weights in certain points of parameter space. Therefore, we in addition present an alternative way to include photonic corrections which avoids negative weights by resumming leading logarithmic contributions from photon emission to all orders and automatically accounts for additional higher order contributions. This method is process-indepenent can be applied to the inclusion of any other 2->2 process at NLO. For Chargino pair-production, we present cross sections as well as differential event distributions for both methods.

Speaker: Dr Tania Robens (RWTH Aachen, Institut fuer Theoretische Physik E)

Paper 0710.2010.pdf

Slides trobens_susy07.pdf

14:20 Two-photon exclusive production of supersymmetric pairs at the LHC

At the LHC, the two-photon production of charged supersymmetric pairs has a unique signature and, for masses below 200-250 GeV, significative cross- sections. In comparison to the nominal supersymmetric studies at the LHC it offers an interesting and very complementary potential. Using the adopted CalcHEP program, interfaced to the Pythia generator, first analysis has been performed of the two-photon chargino, slepton and charged higgs boson pairs in MSSM. The signal selection and suppression of the principal backgrounds due to W boson and lepton pair production have been studied at the generator level, resulting in first sensitivity estimates. Finally, the technical issues of the two-photon event selection in the harsh LHC environment are also discussed, and prospects for further developments are given.

Speaker: Krzysztof Piotrzkowski (Universite Catholique de Louvain)

Slides susy07.pdf

14:40 Probing the SUSY-QCD coupling identity at LHC

Due to supersymmetry, the quark-squark-gluino Yukawa coupling is constrained to be equal to the corresponding quark-quark-gluon QCD gauge coupling. Based on earlier investigations of like-sign dilepton final states, it is shown how information about this coupling can be extracted from an analysis of squark and gluino production processes at LHC. The method is refined to be maximally independent of model assumptions and of data ouside of LHC. Using simulations of the relevant processes, estimates for the expected precision are given.

Speaker: Dr Ayres Freitas (University of Zurich)

Slides freitas_susy.pdf

15:00 Tau polarization in SUSY cascade decays at LHC

Tau leptons emitted in cascade decays of supersymmetric particles are polarized. The polarization may be exploited to determine spin and mixing properties of the neutralinos and stau particles involved. Details of the analysis including experimental effects such as transverse momentum cuts are presented for LHC.

Speaker: Dr Kentarou Mawatari (Korea Institute for Advanced Study)

Paper mawatari_susy07.pdf.pdf

Slides susy07_mawatari.pdf susy07_mawatari.ppt

15:20 Reconstructing Sparticle Mass Spectra using Hadronic Decays

Most sparticle decay cascades envisaged at the Large Hadron Collider (LHC) involve hadronic decays of intermediate particles. We use state-of-the art techniques based on the \kt jet algorithm to reconstruct the resulting hadronic final states for simulated LHC events in a number of benchmark supersymmetric scenarios. In particular, we show that a general method of selecting preferentially boosted massive particles such as W, Z or Higgs bosons decaying to jets, using sub-jets found by the \kt algorithm, suppresses QCD backgrounds and thereby enhances the observability of signals that would otherwise be indistinct. Consequently, measurements of the supersymmetric mass spectrum at the per-cent level can be obtained from cascades including the hadronic decays of such massive intermediate bosons.

Speaker: Mr Are Raklev (University of Bergen)

Slides raklev_are.pdf raklev_are.ppt

15:40 Mass Determination in SUSY-like Events with Missing Energy

We demonstrate that sparticle masses in a susy decay chain can be determined to within about 1 GeV using full kinematic information about the production events. A typical decay chain that we consider is gluino pair production followed by both gluinos decaying to the 2nd lightest neutralino, each of which decays to a slepton and a lepton, followed by each of the sleptons decaying to a lepton and the lightest neutralino (LSP). In short, we are able to determine the absolute mass scale with accuracy similar to that known to be achievable for mass differences in such a decay chain. A description of the technique will be given and several examples provided. The quoted precision is that obtained after including detector resolution and backgrounds.

Speaker: John Gunion (University of California at Davis)

Slides gunion_susy2007.pdf.pdf

14:00 → 16:00 Cosmology 5

14:00 Connections between colliders and cosmology in the nMSSM

In a minimal singlet extension of the MSSM, the nMSSM, both the problem of baryogenesis and dark matter can be elegantly solved without large fine-tuning. As a result of these cosmological constraints, the parameter space of the nMSSM is strongly reduced, and the model predicts that a number of new Higgs and supersymmetric particles are within reach of the LHC and ILC. Here the collider phenomenology at the LHC and ILC is analyzed in detail. It is shown that the LHC could make discoveries of sereval new particles, while precision measurements at the ILC would allow to test the role of the nMSSM for the origin of baryonic matter and dark matter. Also prospects for dark matter direct detection and searches for the electron electric dipole moment are presented.

Speaker: Dr Ayres Freitas (University of Zurich)

Slides freitas_cosm.pdf

14:20 Phenomenology of Models with Mirage Unification

We examine the phenomenology of recently constructed models where moduli-mediated contributions to soft SUSY breaking (SSB) parameters are comparable to those from the Weyl anomaly. This structure of the soft terms arises in models of string compactification with fluxes, where the addition of an anti-brane leads to an uplifting potential which yields a de Sitter Universe and supersymmetry breaking. The apparent (mirage) unification of SSB parameters at a scale not associated with any physical threshold is the hallmark of this scenario. The phenomenology mainly depends on the relative strengths of moduli- and anomaly-mediated contributions to these soft parameters. We delineate the regions of parameter space consistent with the measured relic density of dark matter and other constraints, and display the reach of the LHC and the proposed linear collider. We discuss prospects for detection of dark matter via direct and indirect searches, and show that most of these models should be accessible at a ton-sized noble gas detector. Time permitting, we will also discuss direct tests for mirage unification and how these may lead to a determination of the so-called modular weights.

Speaker: Prof. Xerxes Tata (University of Hawaii)

Slides susy07.pdf

14:40 Non-Universal gaugino masses and implications on the Dark Matter and Higgs searches

Non-universal boundary conditions in grand unified theories can lead to non-universal gaugino masses at the unification scale. In R-parity preserving theories the lightest supersymmetric particle is a natural candidate for the dark matter. We have studied the composition of the lightest neutralino in non-universal gaugino mass cases from the SU(5), and implications on the dark matter. In the 24 dimensional representation areas of proper thermal relic density are found. The possibility to observe the neutral MSSM Higgs bosons (h/H/A) at the LHC via neutralino cascades when the lightest neutralino is dark matter, is discussed, and the connection to neutralino dark matter is established. The talk is based on: K. Huitu, J. Laamanen, P.N. Pandita, S. Roy, Phys.Rev. D72 (2005) 055013 K. Huitu, R. Kinnunen, J. Laamanen, S. Lehti, S. Roy, T. Salminen, (in preparation)

Speaker: Dr Jari Laamanen (Helsinki Institute of Physics)

Paper http://arxiv.org/pdf/0710.2058

Slides susy07-laamanen-relic.pdf

15:00 Lightest neutralino in the MNSSM

In the minimal supersymmetric standard model (MSSM) and Minimal Non--minimal Supersymmetric Standard Model (MNSSM) the lightest neutralino can be absolutely stable providing a good candidate for the cold dark matter component of the Universe. At the same time the \mu problem of the MSSM is solved within MNSSM without accompanying problems related with the appearance of domain walls. In contrast with the MSSM the allowed range of the mass of the lightest neutralino in the MNSSM is limited. We establish the theoretical upper bound on the lightest neutralino mass in the framework of this model. We also obtain an approximate solution for the mass of the corresponding particle. The lightest neutralino is predominantly a singlino so that its couplings to Z boson and other observed particles are suppressed in the considered model.

Speaker: Dr Roman Nevzorov (University of Glasgow)

Paper http://arxiv.org/abs/0710.2550 nevzorov_cosmo_susy07.2550

Slides nevzorov-neutralino.pdf

15:20 Mixed-sneutrino dark matter at the LHC

In supersymmetric theories with right-handed neutrinos, new possibilities open up for dark matter. I will discuss a scenario in which right-handed sneutrinos with weak-scale masses mix with left-handed sneutrinos through weak-scale A terms. In this case the lightest sneutrino mass eigenstate is a viable dark matter candidate. After discussing the constraints on this model from requiring the correct relic abundance and from direct-detection experiments, I will present an analysis of signatures of this scenario at the LHC. The NLSP typically decays promptly, so the phenomenology is distinct from the recently studied case where the LSP sneutrino is almost entirely right-handed. Possible signatures include dileptons with a rather unusual invariant mass distribution, from cascades involving the decay of the lightest neutralino, and Higgs or Z bosons from the decays of the heavier sneutrinos to the lighter ones, produced in association with leptons.

Speaker: David Tucker-Smith (Williams College)

Slides susy2007_dts.pdf

15:40 Dark matter in SUGRA models and the LHC

The minimal supergravity (mSUGRA) model explains the observed dark matter content of the universe and requires the stau-neutralino co-annihilation mechanism in the early universe for a region of supersymmetry parameter space. This co-annihilation region is characterized by a small mass difference (~5-15 GeV) between the lightest stau and the lightest neutralino. An accurate measurement of the small mass difference at a collider is crutial to confirm the co-annihilation mechanism. In this talk, I will discuss the possible signals in the co-annihilation region and the accuracy of measuring this small mass difference at the LHC. I will use these accurately measured parameters to calculate the relic density and show that the accuracy of measuring the dark matter content can be comparable to those obtained from WMAP. I will also show that the gaugino universality condition at the GUT scale can be checked in this coannihilation region at the LHC. This talk is based on the following papers: Phys. Lett. B649 (2007) 73; Phys. Lett. B639 (2006) 46; paper in preparation

Speaker: Prof. David Toback (Texas A&M University)

Slides

• SUSY07_V2.pdf
• SUSY07_V3.pdf
• SUSY07_V3.ppt

14:00 → 16:00 Flavor Physics 3

14:00 Leptogenesis and LFV in the left-right symmetric seesaw mechanism

Studies of leptogenesis and of lepton flavour violation are usually done in the framework of the type I seesaw mechanism, or assume dominance of one of the two (type I or type II) seesaw mechanisms. In this talk, we discuss the generic situation where both contributions to light neutrino masses can be comparable in size and are related by a left-right symmetry. We find qualitatively different results from the type I seesaw mechanism; in particular, we show that the left-right symmetric seesaw mechanism provides new opportunities for successful leptogenesis in SO (10) models.

Speaker: Dr Stephane Lavignac (SPhT Saclay)

Paper 0710.5802.pdf

Slides Lavignac.pdf

14:20 Predictive Model of Inverted Neutrino Mass Hierarchies and Resonant Leptogenesis

I'll discuss the scenario of inverted neutrino mass hierarchies. Due to symmetry arguments, the model has several predictions. The solar mixing angle is correlated to the third leptonic mixing angle such that we get $\theta_{13}>0.13$ and CP violating phase $\delta <45^o$. Moreover, the atmospheric mixing angle is close to the maximal value $45^o$. The neutrino less double beta decay parameter is predicted in a narrow range $0.01 eV< m_{ee}<0.022 eV$. All this can be tested by future experiments. The construction has all ingredients for realizing the resonant leptogenesis, avoiding supersymmetric gravitino problem.

Speaker: Dr zurab tavartkiladze (Oklahoma State University)

Slides Tavartkiladze-SUSY_-07.pdf

14:40 Impact of non-standard neutrino interactions on future oscillation experiments

We discuss impact of non-standard interactions with neutrinos (NSIs) on future oscillation experiments. In order to study the sensitivity to NSIs, we perform the numerical simulations which take into account uncertainties in neutrino oscillation parameters, realistic experimental setups, and their systematic errors. We show that a neutrino factory experiment has excellent prospects of detecting NSIs originating from new physics at the O(1) TeV scale. We also examine the near future experiments, reactor and accelerator experiments, and illustrate the effect of NSIs within the current experimental bounds to the determination of the oscillation parameters such as theta13 and deltaCP.

Speaker: Dr Toshihiko Ota (Max-Planck-Institut fuer Kernphysik)

Paper 0710.1867.pdf.1867

Slides ota.pdf.pdf

15:00 MiniBooNE and shortcuts in the extra dimension

Theories with large extra dimensions have provided new perspectives on a plethora of old problems in particle physics and cosmology. Interesting applications include the amelioration of the large hierarchy between the weak and the Planck scale, the generation of small neutrino masses and the prediction of quatum gravity effects at energy scales around a TeV. Also a non-inflationary solution to the cosmological horizon problem has been advocated, due to graviton shortcuts in the extra-dimensional bulk. The talk introduces a new consequence of extra dimensions, namely neutrino oscillations due to sterile neutrino shortcuts in the extra dimension. This scenario abolishes the contradiction of the LSND neutrino oscillation experiment with other short-baseline experiments and/or solar and atmospheric neutrino oscillation results. It also provides a unique solution to the anomalous events at low energies in the MiniBooNE experiment.

Speaker: Heinrich Paes (University of Alabama)

Paper heinrich_paes_susy07.ps

Slides Shortcuts7.pdf

15:20 Detecting atmospheric neutrino oscillations in ATLAS

We discuss the possibility to study oscillations of atmospheric neutrinos in the ATLAS experiment at CERN. Due to the large detector mass, a significant number of events is expected, and during the shutdown phases of the LHC, reconstruction of these events will be possible with very good energy and angular resolutions. We argue that 500 live days of neutrino running should be achievable, and that a total of about 160 contained nu_mu events and about 750 upward going muons could be collected during this time. Despite the low statistics, the excellent detector resolution will allow for an unambiguous confirmation of atmospheric neutrino oscillations and for a measurements of the leading oscillation parameters. Though our simulations show that the sensitivity of ATLAS is worse than that of dedicated neutrino experiments, we demonstrate that more sophisticated detectors, e.g. at the ILC, could be highly competitive with upcoming superbeam experiments, and might even give indications for the mass hierarchy and for the value of theta_13.

Speaker: Mr Joachim Kopp (Max-Planck Institut fuer Kernphysik, Heidelberg)

Paper http://arxiv.org/pdf/0710.1867

Slides atlas.pdf

15:40 Search for neutrinoless double beta decay with NEMO-3 and SuperNEMO

The NEMO-3 experiment located in the Modane Underground Laboratory (LSM) is searching for neutrinoless double beta decay. The experiment has been taking data since 2003 with a range of isotopes. The main isotopes are ~ 7 kg of 100Mo and ~ 1 kg of 82Se. Since no evidence for neutrinoless double beta decay has been found, a 90% Confidence Level lower limit on the half-life of this process is derived. From this we determine an upper limit on the effective Majorana neutrino mass using nuclear matrix elements. The data are also interpreted in terms of alternative models, such as weak right-handed currents or Majoron emission. In addition, NEMO-3 has performed precision measurements of the double beta decay process with two neutrinos emitted in the final state. Measurements of this process are important for reducing the uncertainties on the nuclear matrix elements. The most recent experimental results will be presented.

Speaker: Vladimir Vasiliev (University College London)

Paper 0710.5090.pdf

Slides

• nemo-susy07.pdf
• nemo-susy07.ppt
• nemo-susy.pdf

14:00 → 16:00 Theoretical Models (String Theory and Formal Aspects of SUSY) 3

14:00 Flux Stabilization in 6 Dimensions: D-terms and Loop Corrections

The D-terms induced by gauge theory fluxes in the context of 6-dimensional supergravity models are discussed. On the one hand, this is arguably the simplest concrete setting in which the controversial idea of `D-term uplifts' can be investigated. On the other hand, it is a very plausible intermediate step on the way from a 10d string theory model to 4d phenomenology. Our specific results include the flux-induced one-loop correction to the scalar potential coming from charged hypermultiplets. Furthermore, we comment on the interplay of gauge theory fluxes and gaugino condensation in the present context, demonstrate explicitly how the D-term arises from the gauging of one of the compactification moduli, and briefly discuss further ingredients that may be required for the construction of a phenomenologically viable model. In particular, we show how the 6d dilaton and volume moduli can be simultaneously stabilized, in the spirit of KKLT, by the combination of an R symmetry twist, a gaugino condensate, and a flux-induced D-term. (Based on hep-th/0611102, by A. P. Braun, A. Hebecker, M. Trapletti)

Speaker: Dr Michele Trapletti (ITP - Heidelberg University)

Paper http://xxx.sissa.it/pdf/0710.4877

Slides trapletti-michele.pdf.pdf

14:20 Smooth heterotic compactifications and anomalous U(1)s

As recently shown, heterotic string compactifications on Calabi-Yau manifolds admit multiple anomalous U(1)s if the gauge background consists of several unitary bundles. Constructions of this type (including 5-branes also) considerably amplify the (standard) model building options on the one hand, and U(1) bundles reproduce (blow-ups of) heterotic Abelian orbifold models on the other hand.

Speaker: Dr Gabriele Honecker (CERN)

Paper 0709.2037.pdf

Slides Honecker_SUSY07.pdf

14:40 F-term uplifting via consistent D-terms

The issue of fine-tuning necessary to achieve satisfactory degree of hierarchy between moduli masses, the gravitino mass and the scale of the cosmological constant has been revisited in the context of supergravities with consistent D-terms. We have studied (extended) racetrack models where supersymmetry breaking and moduli stabilisation cannot be separated from each other. We show that even in such cases the realistic hierarchy can be achieved on the expense of a single fine-tuning. The presence of two condensates changes the role of the constant term in the superpotential, W_0, and solutions with small vacuum energy and large gravitino mass can be found even for very small values of W_0. Models where D-terms are allowed to vanish at finite vevs of moduli fields - denoted `cancellable' D-terms - and the ones where D-terms may vanish only at infinite vevs of some moduli - denoted `non-cancellable' - differ markedly in their properties. It turns out that the tuning with respect to the Planck scale required in the case of cancellable D-terms is much weaker than in the case of non-cancellable ones. We have shown that, against intuition, a vanishing D-term can trigger F-term uplifting of the vacuum energy due to the stringent constraint it imposes on vacuum expectation values of charged fields. Finally we note that our models only rely on two dimensionful parameters: M_P and W_0.

Speaker: Dr Oliver Eyton-Williams (Institute of Theoretical Physics, University of Warsaw, 00-681 Warsaw, Poland)

Slides Oliver_Eyton-Williams.pdf

15:00 Moduli Stabilization in Heterotic-Inspired Supergravity

We discuss moduli stabilization and supersymmetry breaking in the context of the 4d supergravity arising from the heterotic orbifold compactifications. We show that non-perturbative effects alone can lead to a racetrack superpotential which stabilizes the moduli in a supersymmetric minimum and generating a mass hierarchy between the dilaton and the Kahler moduli similar to the KKLT proposal in type IIB. We then study the possibility of realizing within the heterotic string constraints an additional sector which realizes the Intriligator-Seiberg-Shih (ISS) model of meta-stable supersymmetry breaking. In combination this gives a scenario for moduli stabilization in a dS vacuum in the heterotic string with the AdS cosmological constant cancelled by meta-stable supersymmetry breaking along the lines of ISS.

Speaker: Alexander Westphal (SISSA)

Slides Westphal_SUSY_07.pdf

15:20 Low energy SUSY from the heterotic string

I will describe how the MSSM can be constructed from the heterotic string and discuss consequences of this construction, in particular, in relation to the scale of SUSY breaking.

Speaker: Dr Oleg Lebedev (CERN)

Slides lebedev.pdf

15:40 Measuring Fine tuning in Supersymmetry

The solution to fine tuning is one of the principal motivations for supersymmetry. However constraints on the parameter space of the Minimal Supersymmetric Standard Model (MSSM) suggest it may also require fine tuning (although to a much lesser extent). To compare this tuning with different extensions of the Standard Model (including other supersymmetric models) it is essential that we have a reliable, quantitative measure of tuning. We review the measures of tuning used in the literature and propose an alternative measure. We apply this measure to several toy models and the MSSM with some intriguing results.

Speaker: Mr Peter Athron (Glasgow University)

Paper 0710.2486v1.pdf

Slides MeasuringFineTuningInSupersymmetry.ppt

16:00 → 16:30 coffee break

16:30 → 18:30 Colliders - Higgs Phenomenology 6 (Theory)

16:30 Higgs and Sparticle Spectroscopy

We propose using the lightens CP-even Higgs boson mass bound in the minimal supersymmetric standard model (MSSM) to predict the low mass bound for the stop sector. Considering minimal supergravity (mSUGRA) frame and assuming neutralino is dark matter. We can predict in this frame the low bound for all MSSM sparticle spectrum.

Speaker: Dr Ilia Gogoladze (University of Delaware)

Slides susy07.pdf

16:50 Higgs boson production at the LHC: transverse-momentum and rapidity dependence

We consider Higgs boson production by gluon fusion in hadron collisions. We study the doubly-differential transverse-momentum (qT ) and rapidity (y ) distribution of the Higgs boson in perturbative QCD. In the region of small qT (qT << M_H , M_H being the mass of the Higgs boson), we include the effect of logarithmically-enhanced contributions due to multiparton radiation to all perturbative orders. We use the impact parameter and double Mellin moments to implement and factorize the multiparton kinematics constraint of transverse- and longitudinal-momentum conservation. The logarithmic terms are then systematically resummed in exponential form. At small qT , we perform the all-order resummation of large logarithms up to next-to-next-to-leading logarithmic accuracy, while at large qT (qT ∼ M ), we apply a matching procedure that recovers the fixed-order perturbation theory up to next-to-leading order. We present quantitative results for the differential cross section in qT and y at the LHC, and we comment on the comparison with the qT cross section integrated over y .

Speaker: Dr Giuseppe Bozzi (ITP Karlsruhe)

Paper 0710.2422v1.pdf

Slides bozzi.pdf

17:10 Higgs Boson Production via Gluon Fusion: SUSY-QCD Corrections

The loop-induced processes $gg\to h,H,A$ provide the dominant Higgs boson production mechanisms at the Tevatron and LHC in a large range of the minimal supersymmetric extension of the Standard Model. For squark masses below $\sim 400$ GeV squark loop contributions become important in addition to the top and bottom quark loops. The next-to-leading order QCD corrections to the squark contributions of these processes are determined including the full squark and Higgs mass dependences. They turn out to be large and thus important for the Tevatron and LHC experiments. Squark mass effects of the $K$ factors can be of ${\cal O}(20\%)$. In addition we derive the QCD corrections to the squark contributions of the rare photonic Higgs decays $h,H\to \gamma\gamma$, which play a role for the Higgs searches at the LHC.

Speaker: Dr Michael Spira (PSI)

17:30 Susy QCD corrections to Higgs production in gluon fusion

I will present a calculation of the full SUSY QCD radiative corrections in gluon fusion. The required two-loop amplitudes are computed with a new caclculational method for loop diagrams with both infrared and threshold singularities. This computation is a prototype for many similar computations in other than SUSY BSM scenaria.

Speaker: Charalampos Anastasiou (CERN)

Slides anastasiou_susy07.pdf

16:30 → 18:30 Colliders - Susy Phenomenology 6 (Experiment)

Chairperson: Darin ACOSTA

16:30 Searches for Heavy, Long-Lived Particles at CDF

In this talk we present searches for the long lived massive particles and discuss ideas and plans for the future. Exotic stable massive particles often appear in the models beyond the Standard Model such as supersymmetry or extra- dimensions with WIMP or super-WIMP dark matter candidates. We show two completed analysis: the search for the stable massive charged particles (CHAMPs), and the search for displaced vertices with a photon or an electron as a decay product. We also discuss our future plans to look for previously unexplored signatures.

Speaker: Vyacheslav Krutelyov

Slides Llx-susy07-0728.pdf

16:50 R-hadron and long lived particle searches at LHC

We summarise the strategy for searching heavy charged quasi-stable SUSY particles and R-hadrons with the ATLAS detector at the LHC. We review models where R-Hadrons decay in flight within the detector discussing the reconstruction and triggering techniques to be employed to detect such particles.

Speaker: Shikma Bressler (Technion - Israel Institute of Technology)

Paper 0710.2111v3.pdf

Slides longLived.pdf longLived.ppt

17:10 Search for Supersymmetry with Gauge-Mediated Breaking with the D0 Detector

We report the results of a search for supersymmetry (SUSY) with gauge- mediated breaking in the missing transverse energy distribution of inclusive diphoton events using approximately 1.2 fb-1 of data colleced by the D0 experiment at the Fermilab Tevatron Collider in 2002-2006. This analysis is the most sensitive probe for the gauge-mediated SUSY models up to date with a short-lived neutralino as the next-lightest SUSY particle.

Speaker: Yuri Gershtein (Florida State University)

Slides susy07.pdf

17:30 CDF Searches for New Physics with Photons

We present searches for new physics in events containing high--$E_{\rm T}$ photons in CDF Run II data collected at the Fermilab Tevatron. Photons are triggered and reconstructed efficiently and appear in many models such as SUSY, Technicolor, Large Extra Dimensions and compositness. We present results of a search for Randall--Sundrum Gravitons decaying to two photons. We also present searches in signatures including one or two photons with other objects such as leptons, jets and missing $E_{\rm T}$.

Speaker: Dr Andrey Loginov (Yale University, Physics Department)

Paper http://arxiv.org/pdf/0710.1964

Slides loginov_photons_susy2007.pdf loginov_photons_susy2007.ps

17:50 Search for GMSB NLSPs at LHC

Within Gauge-Mediated Supersymmetry Breaking (GMSB) models gravitino is the Lightest Supersymmetry Partner (LSP) whereas neutralino or slepton plays the role of the Next to Lightest Supersymmetry Partner (NLSP). NLSP decays to its Standard Model partner and gravitino with a lifetime depending on the scale of the SUSY breaking. Detection of the NLSP and determination of its properties, in particular lifetime can be of crucial importance for the physics program at LHC. We concentrate on two scenarios specific from the detection point of view. In the first, neutralino decaying in flight is the NLSP. We use not-pointing to the interaction point photons identified by the CMS electromagnetic calorimeter as the signature of decaying in flight neutralinos. We show that it is possible to estimate the ctau of neutralinos for a range from centimeters to meters with a precision of the order of 20%, if the number of produced signal events is not less than about 5000. In the second case a long-lived stau is the NLSP. We show that CMS muon system is able to detect it as a particle traveling with velocity lower than the speed of light, and determine its mass.

Speaker: Piotr Zalewski (Division of High Energy Physics)

Paper piotr_zalewski_susy0710.2647.pdf

Slides zalewski-GMSB-NLSPs-ATLAS-CMS.pdf.pdf

18:10 SUSY parameters determination with ATLAS

We present how parameters such as mass and spin of SUSY particles can be measured at the LHC. The measurements of kinematical distributions, such as edges in the invariant mass of leptons and jets, are used to constrain the model of supersymmetry that we may discover at the LHC. We provide examples from a few points in the mSUGRA scenario and give emphasis to measurements that can be conducted within the first few years of data taking.

Speaker: Nurcan Ozturk (Unknown)

Paper 0710.4546.pdf

Slides NurcanOzturk_SUSY07.pdf NurcanOzturk_SUSY07.ppt

16:30 → 18:30 Cosmology 6

16:30 RH Sneutrino Condensate CDM and the Baryon-to-Dark Matter Ratio

The similarity of the observed densities of baryons and CDM suggest that they have a common or related origin. This can be understood in the context of the MSSM with RH sneutrinos if CDM is due to a d=4 flat direction condensate of very weakly coupled RH sneutrino LSPs and the baryon asymmetry is generated by d = 4 (H_{u}L)^2 Affleck-Dine leptogenesis. An observable CDM isocurvature perturbation is possible in the case of inflation driven by a D-term or by an F-term with suppressed H-corrections to A-terms. Combined with distinctive NLSP collider phenomenology, this would provide a clear signature for RH sneutrino condensate CDM.

Speaker: Dr John McDonald (Lancaster University)

Paper 0710.2360v1.pdf http://arxiv.org/pdf/0710.2360

Slides BDMS07a.pdf

16:50 Unification and Dark Matter in a Minimal Scalar Extension of the Standard Model

The six Higgs doublet model is a minimal extension of the Standard Model (SM) that addresses dark matter and gauge coupling unification. Another Higgs doublet in the 5 representation of a discrete symmetry group, such as S_6, is added to the SM. The lightest components of the 5-Higgs are neutral, stable and serve as dark matter so long as the discrete symmetry is not broken. Direct and indirect detection signals, as well as collider signatures are discussed. The five-fold multiplicity of the dark matter decreases its mass and typically helps make the dark matter more visible in upcoming experiments.

Speaker: Ms Mariangela Lisanti (SLAC, Stanford University)

Slides susy07_6higgs.pdf susy07_6higgs.ppt

17:10 Stability and Leptogenesis in the left-right symmetric SeeSaw mechanism

It has previously been shown that in left-right symmetric type I+II seesaw mechanism, an eight-fold degeneracy among the mass matrices of the heavy right handedneutrinos M_R exist. We discriminate among the degenerate solutions, using stability properties of the solutions and their ability to lead to successful baryogenesis via leptogenesis as criteria. Thus, we can partially lift the eight-fold degeracy. We find in particular that viable leptogenesis is generically possible for four out of the eight solutions.

Speaker: Mr Tomas Hällgren (Royal Institute of Technology (KTH), Department of theoretical physics)

Paper tomas_hallgren_susy07.pdf

Slides SUS07TH.pdf

17:30 Dark matter from brane oscillations

If the Standard Model is confined to a brane that spontaneously breaks some of the space-time symmetries of the embedding space, then additional massive vector fields must be included. According to the low energy, four dimensional effective theory describing this scenario, these vector fields couple to the energy momentum tensor of the Standard Model. As the additional vector fields can be stable, they are potential dark matter candidates. The parameter space of the model is constrained by collider llimits from LEPII and the Tevatron, and the results of current direct and indirect dark matter detection experiments. The reach of the LHC and ILC and next generation of dark matter detection experiments to further probe the parameter space is considered.

Speaker: Prof. Tonnis ter Veldhuis (Macalester College)

Slides terveldhuis.ppt.pdf terveldhuis.ppt.ppt

16:30 → 18:30 Flavor Physics 4

16:30 Renormalization Group Evolution of Neutrino Masses in Type I and Type II Seesaw Scenarios

Analytical formulae of the renormalization group equations are presented in terms of mixing parameters for type I and type II seesaw models. The evolution of neutrino mass parameters are discussed in the SM extended by right-handed neutrinos and a Higgs triplet as well as the extended MSSM. Implications for testing predictions of mass models with future precision experiments are analyzed.

Speaker: Mr Michael Schmidt (Max-Planck Institut für Kernphysik)

Slides SUSY07_mschmidt.pdf.pdf

16:50 Constructing Seesaw Textures in Quark-Lepton Complementarity

We systematically construct the seesaw textures compatible with current data from generic assumptions. We use the context of extended quark-lepton complementarity, i.e., we assume that all contributing mixing angles and mass hierarchies can be described by a small quantity of the order the Cabibbo angle as a single remnant of a Grand Unified Theory. We do not impose special assumptions, such as M_R diagonal, U_l diagonal (no mixings from the lepton sector), or M_D symmetric, but discuss the most general (real) case within the type-I framework. We demonstrate that these special cases only contribute a very small fraction of all constructed seesaw realizations. In addition, we show that often used assumptions for the hierarchies in M_D and M_R are not necessarily our most typical results. In particular, a charged lepton or quark hierarchy in M_D does not appear at all, and both strongly hierarchical or degenerate M_R's, as often used in leptogenesis models, are untypical for the normal neutrino mass hierarchy. Since the allowed set of textures is very large, we show a subjective selection of textures only which could resists increased experimental pressure in the coming ten years. In addition, we mainly focus on the normal neutrino mass hierarchy, since renormalization group effects are small in this case, and hardly affect our procedure.

Speaker: Mr Florian Plentinger (Universität Würzburg)

Paper

• Florian_Plentinger_susy07.pdf
• http://arxiv.org/pdf/0707.2379
• http://arxiv.org/pdf/hep-ph/0612169

Slides Florian_Plentinger_SUSY07.pdf

17:10 Can LHC Test the See-Saw Mechanism?

We consider the prospects for detecting right-handed (Standard Model singlet) neutrinos introduced in the see-saw mechanism at future accelerators. This requires sufficiently large mixing of these neutrinos with the left-handed neutrinos, which is only possible if contributions from different right-handed neutrinos to the light neutrino mass matrix cancel at a level of $10^{-8}$. We search for possible symmetries behind this cancellation. Light neutrino masses can be generated as a result of small perturbations related to violation of these symmetries. The impact of these perturbations on LHC physics is however negligible so that the mechanism of neutrino mass generation and LHC physics are essentially decoupled in general. Under additional assumptions about symmetry breaking some correlation can appear between the collider observables and features of the neutrino mass matrix.

Speaker: Dr Joern Kersten (Abdus Salam ICTP)

Paper Kersten_susy07.pdf

Slides TestSeeSaw.pdf

17:30 Neutrino Masses and Mixings from Quark Mass Hierarchies

Motivated by SO(10) models with a vectorial fourth generation of down quarks and leptons, we consider the scenario where the neutrino Majorana and Dirac mass matrices conincide with those of up- and down-quarks, respectively. Then the small neutrino mass hierarchy follows from the mismatch of the quark mass hierarchies. Together with the observed leptonic mixing angles, we arrive at a tightly constrained scenario and we investigate the consequences for CP- and lepton-number violating processes.

Speaker: Dr Sören Wiesenfeldt (UIUC)

Paper 0710.2186.pdf wiesenfeldt_susy07.tex

Slides wiesenfeldt_soren.pdf

17:50 SO(10) SUSY GUTs with family symmetries: the test of FCNCs

Flavor changing neutral current (FCNC) processes, being forbidden in the Standard Model at the tree level, play an important role in the test of extensions of this model. One popular class of new physics models are Grand Unified Theories (GUTs). Such models, when supplemented by flavor symmetries allow for concrete predictions for various observables - including FCNC processes - in terms of a relatively small number of parameters. We report on a detailed analysis of a supersymmetric SO(10) GUT, recently studied in the literature. We focus on its predictions for FCNCs in the quark sector and confront them with the existing experimental data.

Speaker: Mr Wolfgang Altmannshofer (Technische Universität München)

Paper altmannshofer_susy07.pdf

Slides altmannshofer_SUSY07.pdf.pdf

18:10 Flavor violation in a SUSY GUT

Leptonic and hadronic flavor violations are studied in a general SU(5)-type supersymmetric grand unification model. Due to a GUT symmetry relating quarks and leptons, flavor violating processes in both sectors can be used to constrain a given single source of flavor non-universality at the GUT scale. Without assuming a very specific boundary condition on the soft supersymmetry breaking terms at the scale where they are given, sfermion mass matrices of 10 and 5 bar representations are examined, using recent B physics data and present and future lepton flavor violation bounds.

Speaker: Dr Jae-hyeon Park (Tohoku University)

Paper http://arxiv.org/pdf/0710.4529

Slides jhpark_susy07.pdf

16:30 → 18:30 Theoretical Models (String Theory and Formal Aspects of SUSY) 4

16:30 Confronting Finite Unified Theories with low-energy phenomenology

Finite Unified Theories (FUTs) are N=1 supersymmetric Grand Unified Theories that can be made all-loop finite. The requirement of all-loop finiteness leads to a severe reduction of the free parameters of the theory and, in turn, to a vast number of predictions. Here SU(5) FUTs are investigated in the context of low-energy phenomenology observables. We present a detailed scanning of these FUTs, including theoretical uncertainties at the unification scale and applying all phenomenological constraints. Taking into account all low-energy restrictions, such as the anomalous magnetic moment of the muon, b physics observables, bound on the lightest Higgs boson mass and the constraints from cold dark matter density, we can discriminate between different interesting models. We present the predictions of the allowed parameter space for the Higgs boson sector and the supersymmetric particle spectrum of the model that survives the imposed constraints.

Speaker: Prof. Myriam Mondragon (Instituto de Fisica, UNAM)

Paper 0710.2257.pdf

Slides mondragon-FUT.pdf

16:50 Bulk-brane supergravity

Randall-Sundrum and Horava-Witten scenarios require understanding of bulk-brane interactions in supergravity. Whereas globally supersymmetric models with branes can be easily and consistently constructed, there are still unresolved problems for the locally supersymmetric cases. I will attempt to clarify the problems and report on the progress in their resolution.

Speaker: Dr Dmitry Belyaev (DESY)

Paper BBS.pdf

Slides Belyaev.pdf.pdf

17:10 Energy Transfer and Kaluza-Klein Mode Decay between Throats

Strongly warped regions, also known as throats, are a common feature of the type IIB string theory landscape. If one of the throats is heated during cosmological evolution, the energy is subsequently transferred to other throats or to massless fields in the unwarped bulk of the Calabi-Yau orientifold. This energy transfer proceeds either by Hawking radiation from the black hole horizon in the heated throat or, at later times, by the decay of throat-localized Kaluza-Klein states. In both cases, we calculate in a 10d setup the energy transfer rate (respectively decay rate) as a function of the AdS scales of the throats and of their relative distance . Compared to existing results based on 5d models, we find a significant suppression of the energy transfer rates if the size of the embedding Calabi-Yau orientifold is larger than the AdS radii of the throats. In particular, this is relevant for the analysis of reheating after brane-antibrane inflation. Our calculation employs the dual gauge theory picture in which each throat is described by a strongly coupled 4d gauge theory, the degrees of freedom of which are localized at a certain position in the compact space.

Speaker: Mr Benedict Harling (Institute for Theoretical Physics, Heidelberg)

Slides Harling_Benedict.pdf

17:30 Radius stabilization in 5D SUGRA models on orbifold

We discuss the stabilization of the size of the extra dimension in the 5 dimensional supergravity models compactified on an S^1/Z_2 orbifold. We consider models with boundary superpotentials and analyze the potential for the radion field from the viewpoint of the 4D effective theory.

Speaker: Dr Yutaka Sakamura (Osaka University)

Paper http://arxiv.org/PS_cache/arxiv/pdf/0710/0710.1996v1.pdf

Slides sakamura.pdf sakamura.ppt

21:00 → 22:00 Organ Concert

Organ Concert with Christian-Markus Raiser.

Place: Ev. Stadtkirche at Marktplatz Karlsruhe (next to the pyramid).

Click here for further information.

Sunday, 29 July

09:00 → 18:00 Excursions

There will be organized day trips to Heidelberg and Speyer,
Strasbourg and Northern Alsace, Rhineland-Palatinate and
Suedliche Weinstrasse as well as Baden-Baden and Black Forrest (links
will open a new window).

09:00 Baden-Baden and Black Forrest

Please click here for further information (link will open an new window).

09:00 Heidelberg and Speyer

Please click here for further information (link will open an new window).

09:00 Rhineland-Palatinate and Suedliche Weinstrasse

Please click here for further information (link will open an new window).

09:00 Strasbourg and Northern Alsace

Please click here for further information (link will open an new window).

Monday, 30 July

09:00 → 10:30 Plenary Session

09:00 Little Higgs, non-standard Higgs, no Higgs and all that

Speaker: Hsin-Chia Cheng

Paper http://arxiv.org/pdf/0710.3407

Slides susy07-cheng.pdf.pdf

09:30 Complementarity of LHC and ILC

Speaker: Seong Youl Choi

Paper sychoi_paper.pdf.pdf

Slides sychoi_plenary.pdf sychoi_plenary.ppt

10:00 SUSY predictions and SUSY Tools at the LHC

Speaker: Ben Allanach

Slides allanach.pdf

10:30 → 11:00 coffee break

11:00 → 12:30 Plenary Session

11:00 CP violation in SUSY

Speaker: Sabine Kraml

Paper 0710.5117.pdf

Slides CPV.pdf CPV.ppt

11:30 SUSY Model Building

Speaker: Stuart Raby

Paper raby0710.pdf

Slides Raby.SUSY.2007.portable.ppt

12:00 Theoretical Developments in SUSY

Speaker: Mikhail Shifman

Paper shifman0708.pdf

Slides Shifman-Karlsruhe.pdf

14:00 → 16:00 Alternatives 5

14:00 Hidden Valley Phenomenology

We describe a class of models called ``hidden valleys'', which consist of low mass hidden sector quarks charged under a new confining gauge group. Such sectors arise often in string theories and elsewhere. The phenomenology of these sectors is often qualitatively different from other beyond the standard model physics, giving rise to long lived hidden sector hadrons, high invariant mass jets, and multiple isolated leptons in the final state. We discuss search methods for hidden valleys at hadron colliders.

Speaker: Kathryn Zurek (University of Wisconsin, Madison)

Slides ZurekSUSY07.pdf ZurekSUSY07.ppt

14:20 Search new physics in top quark events with the D0 Detector

The large mass of the top quark, close to the electroweak symmetry-breaking scale, makes it a good candidate for probing physics beyond the Standard Model. Single top quarks may be produced in the decay of a new heavy gauge boson W' and we present limits on the production cross section and the mass of such a W' assuming standard model like couplings. We also search for single top productions through flavor changing neutral currents involving gluon, Z boson, or photon exchange. We also search for non standard model signatures in top pair events. Models for new physics beyond the standard model are probed by looking at possible different event kinematics or deviations in the measured total or differential cross section.

Speaker: Isabelle Ripp (Institut Pluridisciplinaire Hubert Curien (IPHC) - Inst. Nat. Ph)

Paper http://fr.arxiv.org/pdf/0709.2625

Slides susy07_ripp.pdf susy07_ripp.ppt

14:40 Searches for Leptoquark production in $p\bar{p}$ collisions at the D0 experiment

We report on searches for the production of scalar and vector leptoquarks in $p\bar{p}$ collisions at the Tevatron collider, which are based on integrated luminosities of up to 1\,fb$^{-1}$ collected with the D\O{} detector. Leptoquarks, which are predicted by several extensions of the Standard Model, are hypothetical particles carrying both lepton and quark flavors. At hadron colliders they can either be pair-produced via the strong interaction or a single leptoquark can be produced in association with a lepton via the hypothesized leptoquark-lepton-quark coupling. Searches for the pair-production of leptoquarks of all three generations have been performed using the $LQ\overline{LQ}\rightarrow l^+l^-q\bar{q}$, $\rightarrow l^\pm \nu q\bar{q}$, and $\rightarrow \nu\bar{\nu}q\bar{q}$ final states. A search for the single production of leptoquarks coupling to muons is based on the decay channel $LQ\mu\rightarrow\mu q \mu$. Upper limits on the production cross sections are given and are used to derive lower limits on the leptoquark masses.

Speaker: Thomas Nunnemann (Munich)

Paper 0710.0255.pdf

Slides nunnemann_susy07.pdf

15:00 (Non) SUSY Adjoint SU(5)

We propose a renormalizable (susy) grand unified theory where the neutrino masses are generated through type III and type I seesaw mechanisms. Several phenomenological and cosmological aspects of this proposal are discussed.

Speaker: Dr Pavel Fileviez Perez (CFTP, Departamento de Fisica. Instituto Superior Tecnico. Lisbon.)

Paper Pavel_Fileviez_Perez-SUSY07.pdf

Slides Pavel-Fileviez-Perez-SUSY07.pdf

15:20 Vista@CDF: Results of a Model-Independent Search for New Physics in 1fb-1 at CDF

We present the results of a model-independent search for new physics, conducted on 1fb-1 of data collected by the CDF experiment at the Fermilab Tevatron. A novel technique (Vista) is used to analyse the bulk features of the high-pT data. Event populations and approximately 17,000 kinematic distributions from 340 distinct final states are searched for signs of physics beyond the Standard Model.

Speaker: Mr Georgios Choudalakis (MIT)

Paper vistaProceedings.pdf.pdf

Slides vista_choudalakis-susy07.pdf

15:40 Sleuth@CDF: A quasi-model-independent search for new electroweak scale physics

Lacking precise theoretical direction for where to look for the first sign of physics beyond the Standard Model, it seems prudent to look in as many places as possible. Sleuth is a quasi-model-independent search strategy for new electroweak scale physics, appropriate for frontier energy hadron colliders. Assuming the new physics appears in the form of structure with characteristic energy scale at or above the masses of the electroweak gauge bosons, and assuming these new produced resonances decay back to Standard Model objects, it holds generically that the signal will appear as an excess of data in a particular exclusive final state at large summed scalar transverse momentum relative to Standard Model and instrumental backgrounds. Using a background estimate obtained from Vista@CDF, the first global quasi-model-independent search at a frontier energy hadron-hadron collider has been obtained on 1 fb^-1 of Tevatron Run II data with Sleuth@CDF. This quasi-model-independent search represents one of the most encompassing tests of the Standard Model at the energy frontier to date.

Speaker: Mr Georgios Choudalakis (MIT)

Paper sleuthProceedings.pdf.pdf

Slides sleuth_choudalakis_susy07.pdf

14:00 → 16:00 Colliders - Susy Phenomenology 7 (Theory)

Chairperson: Werner POROD

14:00 Sneutrino-antisneutrino mixing at future colliders

Sneutrino-antisneutrino mixing occurs in a supersymmetric model where neutrinos have nonzero Majorana masses. This can lead to the sneutrino decaying into a final state with a ``wrong-sign charged lepton''. In an $e^- \gamma$ collider, the signal of the associated production of an electron-sneutrino and the lighter chargino and the subsequent decays can be $e^- \gamma \rightarrow e^+{\tilde \tau}_1^-{\tilde\tau}_1^- + {p_T \hspace{-.9em}/\;\:}$ where the ${\tilde \tau}_1$s are long-lived and can produce heavily ionizing charged tracks. This signal is free of any Standard Model background and the supersymmetric backgrounds are small. Such a signal can be experimentally observable under certain conditions which are possible to obtain in an anomaly-mediated supersymmetry breaking (AMSB) scenario [1]. At the LHC, sneutrino-antisneutrino mixing can result in a like-sign dilepton signal either through direct sneutrino production or through squark and gluino production. The mixing can also be probed through sneutrino-slepton production. However, in an AMSB scenario, the number of like-sign dilepton signals through sneutrino oscillation is quite small, and backgrounds present a problem for the detectability [2]. [1] T. Honkavaara, K. Huitu, S. Roy, Phys. Rev. D73, 055011 (2006). [2] D.K. Ghosh, T. Honkavaara, K. Huitu, S. Roy, in preparation.

Speaker: Mr Tuomas Honkavaara (Helsinki Institute of Physics)

Paper 0710.2207v2-1.pdf

Slides susy07_honkavaara_id223.ppt

14:20 Effects of Lepton Flavour Violation on Chargino Production at the Linear Collider

We study the effects of lepton flavour violation (LFV) on the production processes $e^+e^-\to\tilde\chi^+_i\tilde\chi^-_j$ at a linear collider with longitudinal $e^+$ and $e^-$ beam polarizations. In the case of LFV the sneutrino mass eigenstates have no definite flavour, therefore, in the $t-$channel more than one sneutrino mass eigenstate can contribute to the chargino production cross sections. Our framework is the Minimal Supersymmetric Standard Model (MSSM) including LFV terms. We show that in spite of the restrictions on the LFV parameters due to the current limits on rare lepton decays, the cross section $\sigma(e^+e^-\to\tilde\chi^+_1\tilde\chi^-_1)$ can change up to one order of magnitude by the influence of LFV. We point out that this can be the case even if the present bound on BR($\tau^-\to e^-\gamma$) improves by a factor of thousand. Our results could have an important impact on the strategies for determining the underlying model parameters at the linear collider.

Speaker: Dr Thomas Kernreiter (University of Vienna)

Paper 0710.1489.pdf

Slides Kernreiter.pdf

14:40 Impact of slepton generation mixing on the search for sneutrinos

We perform systematic study of decays of sneutrinos including bosonic decays such as decays into slepton + (W^+ or H^+) as well as fermionic ones in the Minimal Supersymmetric Standard Model (MSSM) with slepton generation mixings and real parameters. We show that the effect of the slepton generation mixings on the branching ratios of the sneutrino decays (both fermionic and bosonic ones) can be quite strong in a significant part of the MSSM parameter space despite the recent very strong experimental limits on lepton flavour violating processes. This could have an important impact on the search for sneutrinos and the determination of the MSSM parameters at future colliders, such as LHC, ILC, CLIC and muon collider.

Speaker: Prof. Keisho Hidaka (Tokyo Gakugei University)

Paper Hidaka_arXiv_0710.2087v2.pdf

Slides Hidaka@SUSY2007.pdf Hidaka@SUSY2007.PPT

15:00 R-Parity violating minimal supergravity at the LHC

We consider the case where supersymmetry with broken R-parity is embedded in the minimal supergravity model (mSUGRA). This alters the standard mSUGRA spectrum and opens a wide range in parameter space, where the scalar tau is the lightest supersymmetric particle, instead of the lightest neutralino. We study the resulting LHC phenomenology. Promising signatures would be detached vertices from long-lived staus, multilepton final states and multi-tau final states. We investigate the corresponding cross sections and decay rates in detail.

Speaker: Mr Sebastian Grab (Physikalisches Institut Bonn)

Paper http://de.arxiv.org/PS_cache/arxiv/pdf/0710/0710.2034v1.pdf

Slides SebastianGrab.pdf

15:20 Long-lived superpartners in the MSSM

Specific regions in the MSSM parameter space are analysed. It is shown that in the narrow band near the co-annihilation region charged sleptons (staus) may be long-lived particles. This region is consistent with the WMAP restrictions on the Dark matter and depends on the value of \tan\beta. Due to a relatively small mass stau production cross-section at LHC may reach a few % pb. In the other region top squarks become light and even may be the LSP. This happens when the triple scalar coupling A becomes very big compared to m0 and negative. We show that in this case the requirement that the LSP is neutral imposes noticeable constraint on the parameter space similar to constraint from the Higgs mass limit. In some cases these constraints overlap. This picture takes place in a wide region of \tan\beta. In a narrow band close to the border line stops are long-lived particles and decay into quarks and neutralino (chargino). The cross-section of their production at LHC via gluon fusion mechanism in this region may reach a few pb.

Speaker: Dr Alexey Gladyshev (Joint Institute for Nuclear Research)

Paper gladyshev_susy07.pdf

Slides susy07_gladyshev.pdf susy07_gladyshev.ppt

15:40 Sweet Spot Supersymmetry

We explain that there is a sweet spot in between the gauge and gravity mediated supersymmetry breaking scenario where the theory is perfectly consistent with various requirements. At the sweet spot, all the classic problems, such as the supersymmetric flavor/CP problem and the mu-problem are solved. The observed dark matter can be explained by the gravitino (with mass O(1) GeV) produced by the decay of the singlet field which is inevitable for supersymmetry breaking. We also explain that this "sweet spot" predicts a characteristic spectrum of supersymmetric particles, that is light scalar tau lepton and light higgs fermion. We also discuss in characteristic signatures and a strategy for confirmation of this class of theories at the LHC experiments.

Speaker: Dr Masahiro Ibe (Stanford Linear Accelerator center)

Slides IBE_SUSY07.pdf

14:00 → 16:00 Cosmology 7

14:00 Gravitino Dark Matter with Stop as the NLSP

Gravitino has been shown as another viable candidate for dark matter from supergravity models. Gravitino interacting very weakly with other particles, being suppressed by the Planck mass, and as a consequence the Next Lightest Supersymmetric Particle (NLSP) could have a very long lifetime, i.e. becomes a metastable particle. Also because of this very weak interaction , gravitino would be very difficult to detect. The phenomenology of this scenario would depend on the signatures from the NLSP. In this talk I would like to discuss about the feasibility and phenomenology of the stop as the NLSP in a scenario with gravitino LSP as the dark matter.

Speaker: Dr Yudi Santoso (University of Victoria)

Paper http://arxiv.org/pdf/0709.3952

Slides susy07.pdf

14:20 Gravitino dark matter with broken R-parity

We show that in the case of small R-parity and lepton number breaking couplings, primordial nucleosynthesis, thermal leptogenesis and gravitino dark matter are naturally consistent for gravitino masses m_{3/2} \gsim 5 GeV. The metastable next-to-lightest superparticle has a decay length that is typically larger than a few centimeters, with characteristic signatures at the LHC. The photon flux produced by relic gravitino decays may be part of the apparent excess in the extragalactic diffuse gamma-ray flux obtained from the EGRET data for a gravitino mass m_{3/2} \sim 10 GeV. In this case, a clear signal can be expected from GLAST in the near future.

Speaker: Dr Alejandro Ibarra (DESY)

Paper 0710.2287.pdf

Slides ibarra.pdf

14:40 Gravitino Dark Matter and Constraints on the Reheating Temperature

Considering gravitino dark matter scenarios, we study constraints on the reheating temperature of inflation. Within the framework of the constrained minimal supersymmetric Standard Model (CMSSM), we find a maximum reheating temperature of about 10^7 GeV taking into account bound-state effects on the primordial 6Li abundance. We show that late-time entropy production can relax this constraint significantly. With a substantial entropy release after the decoupling of the lightest Standard Model superpartner, thermal leptogenesis remains a viable explanation of the cosmic baryon asymmetry within the CMSSM.

Speaker: Mr Josef Pradler (Max-Planck-Institut für Physik)

Paper 0710.4548.pdf http://arxiv.org/abs/0710.4548

Slides pradler.pdf

15:00 The dark matter as a light gravitino

In gauge mediated supersymmetry breaking models the relatively light messenger and/or secluded sectors can be partly present in the early universe, depending on the value of the reheat temperature. In particular, a relic stable lightest messenger scalar field with a mass greater than a few tens of TeV would typically lead to an overcloser problem. Relying on a recently studied scenario in the context of a (supergravity coupled) unifying $SO(10)$ gauge group, where a solution to this problem can yield cold dark matter light gravitinos even for a very high reheat temperature, we calculate the full one-loop induced lightest messenger annihilation into a pair of gluons, which is the leading process in the determination of the relic abundance of this MSSM singlet messenger. We also analyze, in terms of the messenger and spurion parameters, the ensuing gravitino abundance due to entropy dilution, assuming Planck scale reduced messenger decay into MSSM particles as well as thermal and non-thermal gravitino production. [based on Phys.Lett.B645:222-227,2007, Phys.Rev.D73:043514,2006, JCAP 0607:010,2006]

Speaker: Dr Gilbert Moultaka (LPTA-Montpellier, UMR5207-UM2/IN2P3/CNRS)

Paper 0710.5121

Slides moultaka_SUSY07_cosmology.pdf

15:20 Cosmology of Gravitino LSP Scenario with Right-Handed Sneutrino NLSP

We consider supersymmetric model with right-handed (s)neutrinos where the neutrino masses are purely Dirac type. We discuss cosmology based on such a scenario, paying particular attention to the case that the gravitino is the LSP while the right-handed sneutrino is the next-LSP. It will be shown that the cosmological constraints on the gravitino-LSP scenario (in particular, those from the big-bang nucleosynthesis) are drastically relaxed in such a case. We will also consider the implication of such scenario to the structure formation.

Speaker: Mr Koji Ishiwata (Department of Physics,Tohoku University)

Paper 0710.3624v1.pdf

Slides

• ishiwataV9.pdf
• ishiwataV9.ppt
• susy07V9.pdf

15:40 Gravitino Dark Matter

We will be discussing the scenario that the gravitino is the lightest supersymmetric particle and the long-lived next-to-lightest sparticle (NSP) is either the neutralino or the stau. We calculate the dominant two- and three-body decays of both neutralino and stau NSPs, and model the electromagnetic and hadronic decay products using the PYTHIA event generator and a cascade equation. If stau is the NSP, it can form bound states with several nuclei. These bound states may affect the cosmological abundances of Li6 and Li7 by enhancing nuclear rates that would otherwise be strongly suppressed. We consider the effects of these enhanced rates on the final abundances produced in Big-Bang nucleosynthesis (BBN), including injections of both electromagnetic and hadronic energy during and after BBN. Generically, the introduction of these bound states drives light element abundances further from their observed values; however, for small regions of parameter space bound state effects can bring lithium abundances in particular in better accord with observations. We show that in regions where the stau is the NSP with a lifetime longer than 10^3-10^4 sec, the abundances of Li6 and Li7 are far in excess of those allowed by observations. For shorter lifetimes of order 1000 sec, we comment on the possibility in minimal supersymmetric and supergravity models that stau decays could reduce the \li7 abundance from standard BBN values while at the same time enhancing the \li6 abundance.

Speaker: Dr Vassilis Spanos (University of Patras)

Paper 0710.5311.pdf

Slides spanos_susy07.pdf

14:00 → 16:00 Flavor Physics 5

14:00 Squark and gaugino hadroproduction and decays in non-minimal flavour violating supersymmetry

We present an extensive analysis of squark and gaugino hadroproduction and decays in non-minimal flavour violating supersymmetry (SUSY). Within minimal flavour violation, the flavour violating entries in the squark mass matrices are believed to stem from the trilinear Yukawa couplings of the fermion and Higgs supermultiplets, resulting in different renormalizations of the quark and squark mass matrices through renormalization group running, while within non-minimal flavour violating SUSY, additional sources of flavour violation are included and the off-diagonal terms of the mass matrices cannot be simply deduced from the Yukawa couplings alone. We establish the parameter space regions allowed/favoured by low-energy, electroweak precision, and cosmological data, and define several constrained supersymmetry breaking models with non-minimal flavour violation. We present the cross sections for squark-(anti-)squark/gaugino pair and squark-gaugino associated production processes as well as their decay widths and show their dependence on the off-diagonal mass matrix elements in the experimentally allowed/favoured ranges.

Speaker: Björn Herrmann (LPSC Grenoble)

Paper http://arxiv.org/pdf/0708.3770

Slides herrmann_nmfv.pdf.pdf

14:20 CKM and Tri-bimaximal MNS Matrices in a SU(5) x (d)T Model

We propose a model based on $SU(5) \times { }^{(d)}T$ which successfully gives rise to near tri-bimaximal leptonic mixing as well as realistic CKM matrix elements for the quarks. The Georgi-Jarlskog relations for three generations are also obtained. Due to the ${ }^{(d)}T$ transformation property of the matter fields, the $b$- quark mass can be generated only when the ${ }^{(d)}T$ symmetry is broken, giving a dynamical origin for the hierarchy between $m_{b}$ and $m_{t}$. There are only nine operators allowed in the Yukawa sector up to at least mass dimension seven due to an additional $Z_{12} \times Z_{12}^{\prime}$ symmetry, which also forbids, up to some high orders, operators that lead to proton decay. The resulting model has a total of nine parameters in the charged fermion and neutrino sectors, and hence is very predictive. In addition to the prediction for $\theta_{13} \simeq \theta_{c}/2\sqrt{2}$, the model gives rise to a sum rule, $\tan^{2} \theta_{\odot} \simeq \tan^{2} \theta_{\odot, \mathrm{TBM}} - e^{i\beta} \theta_{c}/2$, which is a consequence of the Georgi-Jarlskog relations in the quark sector. This deviation accounts for the difference between the experimental best fit value for the solar mixing angle and the value predicted by the tri-bimaximal mixing matrix.

Speaker: Prof. Mu-Chun Chen (University of California at Irvine)

Paper 0710.2118v1.pdf

Slides SUSY07-flavor-MCChen.pdf

14:40 A_4 and its double-covering T' as flavor symmetries

In this talk we present a recently published extension of the MSSM which uses T' as flavor symmetry. The model predicts nearly tri-bi-maximal mixing in the lepton sector as well as relates some elements of the CKM matrix to the quark mass ratios. The key point of the model is the VEV alignment of the flavor symmetry breaking fields, i.e. tri-bi-maximal mixing results from different subgroups of T' which are preserved by different sets of these fields. Other phenomenological aspects of the model such as lepton flavor violating decays will be also discussed.

Speaker: Ms Claudia Hagedorn (Max-Planck-Institut fuer Kernphysik)

Slides hagedorn_susy07_v2.pdf.pdf

15:00 Supersymmetric mass spectrum of horizontal symmetries

With the increasing precision on experimental information from flavour violating processes,it is possible to constraint severely theories with horizontal symmetries. These horizontal symmetries, which explain successfully the masses and mixings of fermions, often produce off-diagonal terms in the supersymmetric soft squared mass matrices and in the trilinear terms of the corresponding super-partners, at the scale at which such symmetries are broken. Hence in some cases at electroweak scale these may in fact produce off-diagonal terms that exceed the allowed bounds on flavour changing effects. However in other cases the allowed supersymmetric mass spectrum is enhanced in comparison to that produced assuming the minimal supergravity boundary conditions at high scale. In this talk I will classify those theories which enhance the allowed range of supersymmetric mass spectrum and theories which are likely to be ruled out by upcoming precision on relevant experimental information.

Speaker: Dr Liliana Velasco-Sevilla (University of Minnesota)

Slides Tsusy07_levs.pdf

15:20 SUSY CP and Flavour in SUGRA flavour models with tri-bimaximal lepton mixing

The SUSY CP and flavour puzzle is addressed in a context of recent models of flavour based on SU(3) flavour symmetry. The leptonic tri-bimaximal mixing pattern leads to a simple effective flavour structure giving rise to correlations among the Yukawas and the soft sector that is often enough to ensure compatibility with latest experimental bounds.

Speaker: Dr Michal Malinsky (University of Southampton)

Paper malinsky-arXiv-0710.2430[hep-ph].pdf

Slides malinsky_SUSY07.pdf

15:40 Proton hexality from an anomalous flavor U(1)

We devise minimalist U(1)_X Froggatt-Nielsen models which give rise to the recently proposed low-energy discrete gauge symmetry "proton hexality". The proton is thus stable. In addition, having three generations of right-handed neutrinos we can obtain viable neutrino masses. Furthermore one can find scenarios such that no X-charged hidden sector superfields are needed, which, from a bottom-up perspective, allows the calculation of the string coupling constant g_string. The only mass scale apart from M_grav is m_soft.

Speaker: Dr Christoph Luhn (University of Florida)

Slides luhn-susy07.pdf

16:00 → 16:30 coffee break

16:30 → 18:30 Colliders - Higgs Phenomenology 7 (Theory)

16:30 Determination of the CP quantum numbers of neutral Higgs bosons in the tau decay channels at the LHC

At the LHC we consider, within the MSSM, the production of neutral Higgs bosons via gg-fusion and bb-annihilation and the subsequent decay of these bosons into tau+ tau- pairs. We analyze observables which allow to discriminate between scalar and pseudoscalar Higgs bosons and states of undefined CP parity. NLO QCD corrections are taken into account.

Speaker: Stefan Berge (RWTH Aachen)

Slides berge_susy07.pdf

16:50 Complementarity of h -> eta eta -> 4b in the search of Higgs boson at the LHC

The dominance of $h\to \eta \eta$ decay mode for the intermediate mass Higgs boson is highly motivated to solve the little hierarchy problem and to ease the tension with the precision data. However, the discovery modes for $m_h \alt 150$ GeV, $h \to \gamma\gamma$ and $W/Z h \to (\ell\nu/\ell \bar \ell) (b\bar b)$, will be substantially affected. We show that $h \to \eta \eta \to 4b$ is complementary and we can use this decay mode to detect the intermediate Higgs boson at the LHC, via $Wh$ and $Zh$ production. Requiring at least one charged lepton and 4 $B$-tags in the final state, we can identify a clean Higgs boson signal for $m_h \alt 150$ GeV with a high significance and with a full Higgs mass reconstruction. We use the next-to-minimal supersymmetric standard model and the simplest little Higgs model for illustration.

Speaker: Prof. Kingman Cheung (Natl Tsing Hua Univ)

Paper http://arxiv.org/pdf/0710.1997

Slides higgs-kingman.pdf.pdf

17:10 Hunting a light CP-odd non-standard Higgs boson at a (Super) B factory

We examine the mixing between a light CP-odd Higgs boson and eta_b states and its implications in the decay rates and masses of both physical (mixed) states in different scenarios beyond the minimal extension of the Standard Model. Special emphasis is put on the phenomenology to be observed at high luminosity B factories.

Speaker: Dr Miguel Angel Sanchis Lozano (IFIC - University of Valencia)

Paper sanchis-lozano_contribution.pdf.pdf

Slides leptonuniversality.sanchis.pdf leptonuniversality.sanchis.ppt

17:30 Light pseudoscalar and Higgs decay in the simplest little Higgs mode

The SU(3) simplest little Higgs model, with the mu term introduced by hand, accommodates light pseudo-scalar boson, eta. The eta mass can be at 10-100 GeV scale. For lighter eta, the sizable coupling of H-eta-eta leads to dominant decay of the Higgs boson into a pair of eta's especially when mH below the WW threshold. Another new decay channel of H->Z eta can be dominant or compatible with H-> WW for mH above the Z+eta threshold. We show that the LEP bound on the Higgs boson mass is loosened to some extent due to this new H->eta+eta decay channel as well as the reduced coupling of H-Z-Z. The Higgs boson mass bound falls to about 110 GeV for f=3-4 TeV. We also investigate the discovery potential of such scenarios at the LHC, using the production channels Wh and Zh followed by W-> l+nu and Z-> l+l, and h-> eta eta ->4b. We show that a significant Higgs signal can be found at the LHC for mH<160 GeV.

Speaker: Jeonghyeon Song (Konkuk University)

Paper http://arxiv.org/pdf/0710.1997

17:50 Radiative Yukawa Couplings for Supersymmetric Higgs Singlets at Large tan(beta)

Singlet Higgs bosons present in extensions of the MSSM can have sizable Yukawa couplings to the b quark and the tau lepton for large values of tan (beta) at the 1-loop level. We present an effective Lagrangian which incorporates these tan(beta)-enhanced Yukawa couplings and which enables us to study their effect on singlet Higgs-boson phenomenology within the context of both the mnSSM and the NMSSM. In particular, we find that the loop- induced coupling can be a significant effect for the singlet pseudoscalar, and may dominate its decay modes. Further implications of the tan(beta)-enhanced Yukawa couplings for the phenomenology of the singlet Higgs bosons are briefly discussed.

Speaker: Mr Robert Hodgkinson (University of Manchester)

Paper rn_hodgkinson_sus07.pdf.pdf

Slides hodgkinson-susy07.pdf

16:30 → 18:30 Colliders - Susy Phenomenology 8 (Experiment)

Chairperson: Dirk ZERWAS

16:30 Extended LHC reach of the focus point SUSY region

We have performed detailed analysis of the SUSY focus point (FP) region and work out new set of kinematical variables and cuts which significantly extend LHC reach in FP region compared to previoius results. This opens new perspectives for the SUSY searches at the LHC in FP the related fate of the ILC.

Speaker: Dr Alexander Belyaev (Southampton University - Rutherford Lab)

Slides belyaev_susy07_extending_fp.pdf

16:50 Right-Chiral Sneutrino LSP in mSUGRA: Event characteristics of NLSP at LHC

We study a supersymmetric scenario where the lighter tau-sneutrino is the lightest supersymmetric particle, while the lighter stau-state is the next lightest. Such a scenario can be motivated within the framework of minimal supergravity, with just the addition of a right-chiral neutrino superfield. Such a spectrum leads to rather unusual signals of supersymmetry, showing stable tracks of the stau in the muon chambers. We study the event characteristics of the long-lived staus and demonstrate that the stau tracks can be distinguished from the muonic ones through proper kinematic cuts which also enable one to remove all standard model backgrounds.

Speaker: Dr Santosh Kumar Rai (Helsinki Institute of Physics)

Paper 0710.2508.pdf

Slides rai-susy07.pdf rai-susy07.ppt

17:10 Precision Measurement of the Stop Quark Mass at the ILC

Many supersymmetric models predict many new particles within the reach of the next generation of colliders. For an understanding of the model structure and the mechanism(s) of symmetry breaking, it is important to know the masses of the new particles precisely. The measurement of the mass of the scalar partner of the top quark (stop) at an e+e- collider is studied. A relatively light stop is motivated by attempts to explain electroweak baryogenesis and can play an important role in dark matter annihilation. A method is presented which makes use of cross-section measurements near the pair-production threshold as well as at higher center-of-mass energies. It is shown that this method does not only increase the statistical precision, but also reduces the influence of systematic uncertainties, which can be important. Numerical results are presented, based on a realistic event simulation, for two signal selection strategies: using conventional selection cuts, and using an Iterative Discriminant Analysis (IDA). While the analysis of stops is particularly challenging due to the possibility of stop hadronization, the general procedure could be applied to any mass measurement of particles produced in pairs. Simulation results have been compared with and without the formation of stop hadron states.

Speaker: Andre Sopczak (Lancaster U)

Paper andre_sopczak_susy07.pdf

Slides susy07_andre_sopczak.pdf

17:30 Detecting metastable staus and gravitinos at the ILC

A study of various SUSY scenarios is presented in which the lightest supersymmetric particle is the gravitino $\sG$ and the next-to-lightest supersymmetric particle is a scalar tau $\stau$ with lifetimes ranging from seconds to years. Gravitinos are interesting dark matter candidates which can be produced in decays of heavier sparticles at the International Linear Collider (ILC), but remain undetected in direct searches of astrophysical experiments. We investigate the detection and measurement of metastable staus, which may be copiously produced at the ILC either directly or via cascade decays. A proper choice of the experimental conditions will allow one to stop large samples of staus in the calorimeters of the ILC detector and to study the subsequent decays $\stau\to\tau\sG$. Detailed simulations show that the properties of the stau and the gravitino, such as stau mass and lifetime and gravitino mass, can be accurately determined at a future ILC and may provide direct access to the gravitational coupling, respectively Planck scale.

Speaker: Hans-Ulrich Martyn (RWTH Aachen & DESY)

Paper arXiv_0709.1030

Slides Martyn_SUSY07.pdf Martyn_SUSY07.ppt

17:50 Spin Analysis of Supersymmetric Particles

The spin of supersymmetric particles can be determined at e+e- colliders unambiguously without any model assumptions. This will be demonstrated for sleptons and charginos/neutralinos, based on the analysis of excitation curves and angular distributions in production and decay processes. In this way supersymmetry can be discriminated from theories with isomorphic particle spectra like universal extra dimensions.

Speaker: Peter Matthias Zerwas (DESY Hamburg / RWTH Aachen)

Paper http://arxiv.org/pdf/0710.2822

Slides http://www.desy.de/~zerwas/ac/KA0725.pdf

16:30 → 18:30 Cosmology 8

16:30 Gauge Invariant MSSM Inflation

Minimal Supersymmetric Standard Model has all the ingredients to provide a successful inflation. The inflaton is a gauge invariant flat direction which carries the Standard Model charges. I will discuss how such a model predicts the CMB observations and provides hope for its detectability at LHC. I will also discuss how a thermal production of neutalino in conjunction with MSSM inflation provides interesting bench mark points for the squarks and sleptons which drive inflation.

Speaker: Dr Anupam Mazumdar (NORDITA)

16:50 Gravitino Production from Late-Decaying Scalar Field

We will discuss the gravitino production in early universe from scalar field which reheats the universe. Such production is pointed out to be rather generic and modify usual cosmological scenarios significantly. To be concrete, we will analyze several inflation models.

Speaker: Dr Motoi Endo (DESY)

Slides endo-gravitino.pdf

17:10 Gravitino Overproduction from Inflaton Decay, and its implication for SUSY breaking

I will discuss the recently discovered gravitino overproduction from inflaton decay, particualrly focusing on its implication for the SUSY breaking and inflation models. Importantly, since the inflaton generically produces the gravitinos, those constraints will turn out to be quite useful to know which models are realized in nature, especially when the upcoming collider experimental data and/or cosmological observation become available.

Speaker: Dr Fuminobu Takahashi (DESY)

Slides takahashi-susy07.pdf

17:30 Curvature and isocurvature perturbations in two-field inflation

We study cosmological perturbations in two-field inflation, allowing for non-standard kinetic terms. We calculate analytically the spectra of curvature and isocurvature modes at Hubble crossing, up to first order in the slow-roll parameters. We also compute numerically the evolution of the curvature and isocurvature modes from well within the Hubble radius until the end of inflation. We show explicitly for a few examples, including the recently proposed model of `roulette' inflation, how isocurvature perturbations affect significantly the curvature perturbation between Hubble crossing and the end of inflation.

Speaker: Dr Krzysztof Turzynski (University of Michigan)

Paper http://arxiv.org/PS_cache/arxiv/pdf/0704/0704.0212v1.pdf

Slides Turzynski.pdf Turzynski.ppt

17:50 Inhomogeneous preheating in multi-field inflationary models

We consider an inhomogeneous preheating scenario in multi-field inflationary models. There are at least two fields trapped at the ESP after preheating, one is the inflaton and the other is a ``trapped field'' that plays important role in generating the curvature perturbation. We consider several kinds of the potential for the trapped field, which mimics thermal or quintessential inflation.

Speaker: Mr Tomohiro Matsuda (Saitama Institute of Technology)

Paper Authors: Tomohiro matsuda Comments: Submitted for the SUSY07 proceedings, 4 pages, LaTeX, 8 eps figures.

Proceedings http://arxiv.org/abs/0709.0573

Slides Tmatsuda.pdf

18:10 Chaotic inflation model dominated by the D-term in supergravity

We present a chaotic inflation model dominated by the D-term in supergravity. Our model opens a new branch of model building for inflation.

Speaker: Mr Masahide Yamaguchi (Aoyama Gakuin University)

Slides SUSY07_yamaguchi.ppt

16:30 → 18:30 Flavor Physics 6

16:30 D0 Mixing at the B-Factories

We present results for D0-anti-D0 mixing using several different techniques from e+e- colliding-beam data recorded near sqrt(s) 10.6 GeV with the BaBar detector at the PEP-II storage rings at SLAC.

Speaker: Carlos Chavez (16509268522)

Slides SUSY-07-Chavez.pdf

16:50 Search for anomalous direct and indirect CP violation in b to c transitions at Dzero

We search for anomalous charge asymmetries in the b to c transitions of both neutral and charged B mesons. Indirect CP violation in Bd and Bs mixing is studied using semileptonic decays. Direct CP violation in B+ decay is studied using exclusive decays to J/psi mesons. The results are based on a large data set of proton-antiproton collisions recorded by the Dzero detector operating at the Fermilab Tevatron Collider. Dzero contains independent spectrometers based on an inner solenoid and outer toroids. The magnet polarities are reversed on a regular basis allowing for unprecedented control of the systematic uncertainties associated with charge asymmetry measurements in B meson mixing and decay. The results presented can be used to limit new physics in both Delta Bd and Delta Bs = 2 operators as well as limit recent fourth generation models.

Speaker: Pieter van den Berg

Slides CP-violation_in_b_to_c_transitions_with_backup_slides.pdf

17:10 The MFV-MSSM as a natural route to near-flavour-conservation in SUSY. Application to meson mixings

We apply the effective field theory definition of Minimal Flavour Violation (MFV) to the MSSM, requiring the squark soft terms to become functions of the SM Yukawa couplings. For the case of meson oscillations in the DB=2 sector, we show that this approach leads to a striking increase of the predictivity of the model. In particular, we find (i) SUSY corrections to be naturally small and always positive (ii) if mu is not small, an increase in importance (even for low tan beta) of scalar operators due to gluino contributions. The last point signals that (V-A) x (V-A) dominated MFV is in general inconsistent with the MSSM. In this context, we also briefly discuss the MFV-Unitarity Triangle.

Speaker: Dr Diego Guadagnoli (Technical University Munich)

Paper 0710.2038.pdf

Slides guadagnoli-susy07.odp guadagnoli-susy07.pdf

17:30 The Higgs sector of the MSSM and B-Bbar mixing for large tan(beta)

A systematic analysis of supersymmetric effects in the B_d and B_s mass differences is performed in the large tan(beta) regime. Emphasis is laid on the impact of heavy sparticles on the effective Higgs-mediated FCNC amplitudes.

Speaker: Dr Stephanie Trine (University of Karlsruhe)

Paper Trine_susy07.pdf.pdf

Slides SUSY07_Trine.pdf

17:50 Bs-Bsbar mixing and Bs-->KK decays within supersymmetry

We consider the constraint of Bs-Bsbar mass difference, Delta m_s, on an MSSM scenario with large flavor mixing. Even with this constraint, we show that a large deviation from the SM in CP asymmetries of Bs-->KK decays is still possible, making this channel promising in search for supersymmetry.

Speaker: Seungwon Baek (Korea Univ.)

Paper 0710.3255v1.pdf http://arxiv.org/PS_cache/arxiv/pdf/0710/0710.3255v1.pdf

Slides SBaek-SUSY07.pdf SBaek-SUSY07.ppt

16:30 → 18:30 Theoretical Models (String Theory and Formal Aspects of SUSY) 5

16:30 Intersecting Brane Models and Cosmology

We introduce a novel mechanism for baryogenesis, in which mixed anomalies between the hidden sector and $U(1)_{baryon}$ drive the baryon asymmetry. We demonstrate that this mechanism occurs quite naturally in intersecting- brane constructions of the Standard Model, and show that it solves some of the theoretical difficulties faced in matching baryogenesis to experimental bounds. We illustrate with a specific example model. We also discuss the possible signals at the LHC. We conclude by discussing some work currently in progress, in which we exhibit a scenario for D-term inflation which naturally fits into the structure of intersecting brane models. In this scenario, tachyonic preheating at the end on inflation can robustly drive hidden sector baryogenesis. We also briefly discuss implementations of this scenario in which Majorana neutrino masses are generated at the end of inflation.

Speaker: Jason Kumar (Texas A&M University)

Paper 0710.2141v1.pdf

Slides susy07h.pdf

16:50 Extended Higgs Models and the Transition to Exact Susy

String landscape ideas and the observation of a positive vacuum energy in the current universe suggest that there could be a future transition to an exactly supersymmetric world. Atomic and molecular binding in this susy background probably require that electroweak symmetry breaking survives the transition. Among several susy higgs models that have been discussed, one stands out in this regard. Thus, the higgs structure that is revealed at the LHC could have strong consequences for the type of bulk susy matter that may arise in a future susy universe.

Speaker: Louis Clavelli (University of Alabama)

Paper ArXiv:0710.2341 Clavelli_susy07.tar.gz.gz

Slides Clavelli07.pdf

17:10 Cycling in the Throat

I will discuss the dynamics of a probe D3-brane propagating in a warped string compactification. I will focus in the exploration of the trajectories obtained from giving the brane angular momentum in the extra dimensions. I will show that, in general, angular momentum creates a centrifugal barrier, causing bouncing as well as cyclic cosmologies from a "mirage" point of view. I will also comment on how these results get modified once the effects of coupling the brane action to gravity, are taken into account.

Speaker: Dr Ivonne Zavala (Durham University)

Slides Zavala.pdf

17:30 Very Light Cosmological Scalar Fields from a Tiny Cosmological Constant

We propose a new mechanism to generate the mass of a scalar field in an expanding universe. The mass of this field turns out to be generated by the cosmological constant and can be naturally small if protected by a conformal symmetry which is however broken in the gravitational sector. The mass is comparable today to the Hubble time. This scalar field could thus impact our universe today and for example be at the origin of a time variation of the couplings and masses of the parameters of the standard model. A time variation of the parameters of the standard model would allow to test grand unified theories.

Speaker: Dr Xavier Calmet (Université Libre de Bruxelles)

Slides SUSY07calmet1.pdf.pdf

17:50 Signals of Supercritical String Theory at the LHC

Recently, it is shown that the modifications of the Boltzmann equation describing the evolution of relic abundances due to dilaton dissipative-source and non-critical-string terms change the cosmologically allowed parameter space of SUSY model. In this talk, we will investigate the allowed parameter space in the context of minimal SUGRA boundary condition at the LHC. We will characterize the experimental final states to distinguish the new scenario from the standard scenario. We will also discuss the impact of the new scenario in dark matter detection rates. Work done in collaboration with: B. Dutta, A. Krislock and D. Nanopoulos

Speaker: Prof. Teruki Kamon (Texas A&M University)

Slides susy2007_Kamon_LHC-SSC.pdf

18:10 Large Gravitational Waves in String-Inflation

The potential detection of gravitational waves from string inflation would provide essential complementary information to measurements of the scalar spectral index. E.g.~it can tell us directly the size of the inflationary potential. It is, however, clear that warped brane inflation (in case it can be tuned to give inflation) cannot lead to measurable gravitational waves. We will discuss in this talk other realizations of string inflation which lead naturally to a tensor fraction $r=T/S$, which lies comfortably within the expected observable window of $0.3 > r > 10^{-3}$. We will also address how the problem of satisfying the Lyth bound can be solved in these realizations, at the same time.

Speaker: Dr Axel Krause (Arnold Sommerfeld Center, LMU Muenchen)

Slides SUSY07.pdf

Tuesday, 31 July

09:00 → 10:30 Plenary Session

09:00 Strings and Particle Physics

Speaker: Hans-Peter Nilles

Slides 07susy.pdf

09:30 Strings and Cosmology

Speaker: Andrei Linde

Slides LindeSUSY07.pdf

10:00 Colliders and Cosmology

Speaker: Keith Olive

Paper 0709.3303.pdf

Slides susy07final.pdf susy07.pdf

10:30 → 11:00 coffee break

11:00 → 12:30 Plenary Session

11:00 Inflation and Unification

Speaker: Quaisar Shafi

Paper 0709.3983.pdf

Slides SUSY_2007_new.pdf

11:30 Present and Future of Neutrino Masses

Speaker: Guido Drexlin

12:00 SUSY and Seesaw

Speaker: Antonio Masiero

Slides susy07_masiero.pdf

14:00 → 16:00 Alternatives 6

14:00 Renormalizable 1/N Expansion for Field Theories in Extra Dimensions

We demonstrate how one can construct renormalizable perturbative expansion in formally nonrenormalizable higher dimensional field theories. It is based on $1/N$-expansion and results in a logarithmically divergent perturbation theory in arbitrary high space-time dimension. First, we consider a simple example of $N$-component scalar filed theory and then extend this approach to Abelian and non-Abelian gauge theories with $N_f$ fermions. In the latter case, due to self-interaction of non-Abelian fields the proposed recipe requires some modification which, however, does not change the main results. The resulting effective coupling is dimensionless and is running in accordance with the usual RG equations. The corresponding beta function is calculated in the leading order and is nonpolynomial in effective coupling. It exhibits either UV asymptotically free or IR free behaviour depending on the dimension of space-time. The original dimensionful coupling plays a role of a mass and is also logarithmically renormalized. We analyze also the analytical properties of a resulting theory and demonstrate that in general it acquires several ghost states with negative and/or complex masses. In the former case, the ghost state can be removed by a proper choice of the coupling. As for the states with complex conjugated masses, their contribution to physical amplitudes cancels so that the theory appears to be unitary.

Speaker: Mr Grigory Vartanov (Joint Institute for Nuclear Research)

Paper Vartanov07.pdf

14:20 Dynamical breakdown of Abelian gauge chiral symmetry by strong Yukawa interactions

We consider a model with anomaly-free Abelian gauge axial-vector symmetry, which is intended to mimic the standard electroweak gauge chiral SU(2)_L x U(1)_Y theory. Within this model we demonstrate: (1) Strong Yukawa interactions between massless fermion fields and a massive scalar field carrying the axial charge generate dynamically the fermion and boson proper self- energies, which are ultraviolet-finite and chirally noninvariant. (2) Solutions of the underlying Schwinger-Dyson equations found numerically exhibit a huge amplification of the fermion mass ratios as a response to mild changes of the ratios of the Yukawa couplings. (3) The `would-be' Nambu-Goldstone boson is a composite of both the fermion and scalar fields, and it gives rise to the mass of the axial-vector gauge boson. (4) Spontaneous breakdown of the gauge symmetry further manifests by mass splitting of the complex scalar and by new symmetry-breaking vertices, generated at one loop. In particular, we work out in detail the cubic vertex of the Abelian gauge boson. Based on Phys.Rev. D75 (2007) 056003 (arXiv:hep-ph/0605147).

Speaker: Mr Petr Benes (Department of Theoretical Physics, Nuclear Physics Institute, Rez near Prague, Czech Republic)

Slides slideshow_new.pdf

14:40 Hidden fermion as milli-charged dark matter in Stueckelberg Z' model

The hidden Stueckelberg Z' model is augmented by a pair of Dirac fermions. We show that this hidden fermion-antifermion pair could be a milli-charged dark matter candidate with a viable relic density. Existing terrestrial and astrophysical searches on milli-charged particles do not place severe constraints on this hidden fermion. We calculate the flux of monochromatic photons coming from the Galactic center due to pair annihilation of these milli-charged particles and show that it is within reach of the next generation gamma-ray experiments. The characteristic signature of this theoretical endeavor is that the Stueckelberg Z' boson has a large invisible width decaying into the hidden fermion-antifermion pair. We show that existing Drell-Yan data do not constrain this model yet. Various channels of singly production of this Z' boson at the LHC and ILC are explored.

Speaker: Dr Tzu-Chiang Yuan (National Tsing Hua University)

Paper 0710.2005v2.pdf

Slides TCYuan-StuZprime.pdf

15:00 Novel signals in unparticle physics

Phenomenology of the notion of an unparticle $\U$, recently perceived by Georgi, to describe a scale invariant sector with a non-trivial infrared fixed point at a higher energy scale is explored in details. Behaving like a collection of $d_\U$ (the scale dimension of the unparticle operator $\cal O_U$) invisible massless particles, this unparticle can be unveiled by measurements of various energy distributions for the processes $Z \to f \bar f \U$ and $e^- e^+ \to \gamma \U$ at $e^-e^+$ colliders, as well as mono-jet production at hadron colliders. We also study the propagator effects of the unparticle through the Drell-Yan tree level process and the one-loop muon anomaly.

Speaker: Prof. kingman Cheung (Natl Tsing Hua Univ)

Paper http://arxiv.org/pdf/0710.2230

Slides Alternative-kingman.pdf.pdf

15:20 Noncommutative Higgs and/or Dark Matter Sectors

We consider gauge theories in a strong external magnetic like field. This situation can appear either in conventional four-dimensional theories, but also naturally in extra-dimensional theories and especially in brane world models. We show that in the lowest Landau level approximation, some of the coordinates become non-commutative. Our construction is applied to a minimal extension of the standard model. It is shown that the Higgs sector might be non-commutative whereas the remaining sectors of the standard model remain commutative. Signatures of this model at the LHC are discussed. We then discuss an application to a dark matter sector coupled to the Higgs sector of the standard model and show that here again, dark matter could be non-commutative, the standard model fields remaining commutative.

Speaker: Dr Xavier Calmet (Université Libre de Bruxelles)

Paper 0704.1355v2.pdf

Slides sUSY07calmet2.pdf.pdf

15:40 Conformal Symmetry and the Standard Model

We argue that radiative symmetry breaking in the Standard Model with classically unbroken conformal symmetry in the presence of right-chiral neutrinos and a minimally enlarged scalar sector naturally introduces and stabilizes a hierarchy without the need for low energy supersymmetry. The model is compatible with all available data; in particular, there exists a set of parameters for which it may remain viable even up to the Planck scale.

Speaker: Prof. Krzysztof Meissner (Institute of Theoretical Physics, University of Warsaw)

14:00 → 16:00 Colliders - Susy Phenomenology 9 (Theory)

Chairperson: Werner POROD

14:00 A Collider Signature of the Supersymmetric Golden Region

Null results of experimental searches for the Higgs boson and the superpartners imply a certain amount of fine-tuning in the electroweak sector of the Minimal Supersymmetric Standard Model (MSSM). The "golden region'' in the MSSM parameter space is the region where the experimental constraints are satisfied and the amount of fine-tuning is minimized. In this region, the stop trilinear soft term is large, leading to a significant mass splitting between the two stop mass eigenstates. As a result, the decay of the heavier stop into the lighter stop and a Z boson is kinematically allowed throughout the golden region. We propose that the experiments at the Large Hadron Collider (LHC) can search for this decay through an inclusive signature, Z+2jb+missing Et+X. We evaluate the Standard Model backgrounds for this channel, and identify a set of cuts that would allow detection of the supersymmetric contribution at the LHC for the MSSM parameters typical of the golden region. We also discuss other possible interpretations of a signal for new physics in the Z+2jb+missing Et+X channel, and suggest further measurements that could be used to distinguish among these interpretations.

Speaker: Mr Christian Spethmann (Cornell University)

Paper spethmann.pdf.pdf

Slides spethmann.pdf

14:20 LHC detection reach for lambdaSusy

Recently a non conventional scenario for low energy SUSY has been proposed (lambdaSusy). The main features of this model are an additional scalar singlet and a nearly-strong coupling in the scalar potential. This leads to a heavy higgs boson consistently with EWPT. Collider phenomenology for this model is quite different from standard Susy. In this work we address the issue of detection and discovery reach at the LHC, studying production and decay channels for the three neutral bosons. A careful analysis of SM backgrounds at partonic level suggests experimental discovery is possible with high enough integrated luminosity.

Speaker: Roberto Franceschini (Scuola Normale Superiore Pisa)

Paper Franceschini_susy07.pdf.2477

Slides lsusy07.pdf

14:40 SUSY dark matter models with a well-tempered neutralino

While most of parameter space of the mSUGRA model is excluded by the constraint on dark matter relic density, a variety of well-motivated models with non-universal soft breaking terms can easily accommodate the relic abundance. I survey various models with non-universal scalar and gauginos masses by the names of NUHM1, NUHM2, NMH, MWDM, BWCA-DM and compressed SUSY, or LM3DM. Each of these scenarios gives rise to unique predictions for collider and dark matter detection phenomenology.

Speaker: Prof. Howard Baer (Florida State University)

Slides baer_susy07.pdf

15:00 Flavour Violating Interactions of Supersymmetric Particles

In a wide class of supersymmetric models, the soft SUSY breaking parameters are determined by high scale physics. Using an appropriate high scale ansatz, weak scale SUSY couplings relevant for phenomenology can then be theoretically calculated using renormalization group (RG) methods. This procedure also allows us to obtain predictions for the flavour structure of the theory. To accurately obtain the RG prediction at the two loop level, effects of thresholds at one loop must be incorporated. These include the decoupling of heavy particles and the concomitant splitting between couplings that are equal in the SUSY limit (the gauge and gaugino couplings, for instance). The threshold effects can filter back into the overall running, and both the decoupling and the splitting must therefore be considered if true two loop level accuracy is to be obtained. We describe a method that allows the calculation of all soft supersymmetry breaking parameters. A program (to be incorporated into ISAJET) has been developed, which includes flavour violating couplings of superparticles based on an arbitrary framework for the high scale flavour structure. The weak scale flavour structure derived in this way can be applied to the study of SUSY flavour changing decays. As an illustration, we recalculate the branching ratio of the flavour-violating decay of the top squark.

Speaker: Mr Andrew Box (University of Hawaii)

Paper 0710.5055.pdf

Slides ABox_SUSYColliders.pdf

15:20 Nonlinear gauge fixing for FeynArts

Nonlinear gauge fixing is used for checking the internal consistencies of automated calculations. We implement the nonlinear gauge fixing, as proposed by Boudjema and Chopin, into FeynArts. We have to modify not only the model files, but also the Lorentz.gen file, as the nonlinear gauge fixing introduces terms that are not contained in the standard form for the vertices. We check our modifications by checking amplitudes analytically and by performing tree level and one loop calculations.

Speaker: Thomas Gajdosik (Fizikos Institutas and Vilnius University)

Paper garfield-paper.pdf.1999

Slides garfield-SUSY07.pdf garfield_SUSY_talk.pdf

15:40 ffmssmsc -- a C++ library for superpartner mass calculation and renormalization group analysis of the MSSM

the main objectives of the ffmssmsc library are 1. Given the set of SM and QCD "observables", the model of SUSY breaking, calculate the MSSM Lagrangian parameters. 2. Given the MSSM Lagrangian parameters, calculate the physical (pole) masses of the superpartners. I discuss relevant physical principles, some implementation details, and accuracy estimates. The draft is available at http://theor.jinr.ru/~varg/ffmssmsc.pdf

Speaker: Alexei Sheplyakov (JINR)

Slides ffmssmsc.pdf

14:00 → 16:00 Cosmology 9

14:00 Extremely Long Lived Charged Massive Particles as A Probe of the Early Universe

We consider the role of extremely long lived charged massive particles in the early Universe and discuss what we can learn if we discover such long lived charged massive particle particles at future collider experiment.

Speaker: Dr FUMIHIRO TAKAYAMA (CORNELL UNIVERSITY)

Slides takayama.pdf takayama.ppt

14:20 Supersymmetry, Dark Matter, and Dark Energy

Kination-dominated quintessence scenarios can provide an intriguing connection between thermal WIMP dark matter and dark energy which can be tested at forthcoming and future colliders. We present the results of our investigation of the implications of such nonstandard cosmological models for neutralino dark matter in the MSSM, focusing on the role of the ILC in determining the parameter space constraints. We also describe a procedure in which such kination-dominated quintessence scenarios can be embedded within inflationary cosmology.

Speaker: Prof. Lisa Everett Everett (University of Wisconsin)

Slides susy_everett07.pdf

14:40 Robustness of quintessence models against quantum corrections

We investigate the role of quantum corrections within the quintessence dark energy scenario in the framework of low-energy effective field theory. In this framework, the quintessence field, which can drive an accelerated cosmic expansion, is viewed as arising from a high-energy theory, which is governed by a UV-scale of the order of the GUT or Planck scales. We study the low-energy effective action, discuss suitable approximations, and extend previous studies by identifying and resumming the relevant contributions, which explicitly depend on the UV-scale. For two exemplary classes of models the resulting modified potential is used to study their robustness.

Speaker: Mr Mathias Garny (Max Planck Institute for Nuclear Physics)

Slides mgarny.pdf

15:00 A New Constraint System Applied to Modifying Gravity

A new class of constraint system applicable to continuous covariant field theories is explained. When coupled to gravity, it modifies the constraints of Einstein equations. Cosmological implications are also presented.

Speaker: Prof. Daniel Chung (University of Wisconsin)

Slides danielchung.pdf

15:20 Primordial nucleosynthesis as a probe of fundamental physics parameters

We analyze the effect of variation of fundamental couplings and mass scales on primordial nucleosynthesis in a systematic way. The first step establishes the response of primordial element abundances to the variation of a large number of nuclear physics parameters, including nuclear binding energies. We find a strong influence of the $n-p$ mass difference (for the \hefo\ abundance), of the nucleon mass (for deuterium) and of $A=3,4,7$ binding energies (for \heth, \lisi\ and \lise). A second step relates the nuclear parameters to the parameters of the Standard Model of particle physics. The deuterium, and, above all, \lise\ abundances depend strongly on the average light quark mass $\hat{m}\equiv (m_u+m_d)/2$. We calculate the behaviour of abundances when variations of fundamental parameters obey relations arising from grand unification. We also discuss the possibility of a substantial shift in the lithium abundance while the deuterium and \hefo\ abundances are only weakly affected.

Speaker: Dr Thomas Dent (Heidelberg)

Slides DentBBN.pdf

15:40 Low energy particle physics and cosmology of Nonlinear Supersymmetric General Relativity(NLSUSUGR)

MSSM and SUSY GUTs are the candidates of theoretical models beyond SM. However the naive extensions of SM allow many arbitrary parameters and many unobserved elementary (SUSY) particles, which lose simplicity of Nature and the predictive powers. In this talk, firstly we review quickly the NLSUSYGR which describes the　NLSUSY invariant coupling of (Nambu-Godldstone fermion) Volkov-Akulov model of NLSUSY with Eistein general relativity from the geometrical and algebraic viewpoints. Secondly we show that in the assymptotic flat spacetime the matter sector of NLSUSYGR is recasted as the familiar linear SUSY model and give new insights into the origin of mass, SUSY breaking scale, dark energy, neutrino mass, etc. These may suggest the only N-fundamental objects (N Nambu-Goldstone fermionｓ) as the ultimate objects for all (obsserved) particles and forces except gravity. Gravity is accomodated as elementary. [REF.} K. Shima,Phys.Lett.B501(2001)237, K. Shima, M. Tsuda and Y. Tanii, Phys.Lett.B546(2002)162. K. Shima and M. Tsuda, Phys.Lett.B645(2007)455. K. Shima and M. Tsuda, PoS HEP2005(2006)011. K. Shima and M. Tsuda, in preparation.

Speaker: Kazunari Shima

Paper http://lanl.arxiv.org/pdf/0710.2636

Slides susy07pdf.pdf

14:00 → 16:00 Flavor Physics 7

14:00 Study of annihilation and radiative decays of heavy mesons at Dzero

We search for the rare decays Bs to mu+mu- and D+ to pi+ mu+ mu- using a large data set of proton-antiproton collisions recorded by the Dzero detector operating at the Fermilab Tevatron Collider. These modes are expected to have sizeable enhancements above the Standard Model rate due to new physics. The Bs annihilation rate is expected to have orders of magnitude enhancement in many models with large tan(beta) while the radiative charm decays probe scenarios where sizeable new physics contributions are visible in the up-sector quarks but not in the down-sector quarks. We present the most stringent limits on both processes.

Speaker: Elliott Cheu (Department of Physics)

Slides susy07_echeu.pdf

14:20 Search for Rare B and D Hadron Decays at CDF

We present the current status of rare B decay searches B0(s) --> mu+ mu-, B0 --> mu+ mu-, B+ --> K+ mu+ mu-, B0 --> K*0 mu+ mu-, B0(s) --> phi mu+ mu-, and a search for D0 -> mu mu as well as other rare B and D decay modes at CDF operating at the Fermilab Tevatron Collider.

Speaker: Philipp Mack

Paper 0710.2502.pdf

Slides Rare_B_decays_CDF.pdf.pdf

14:40 Study of the decay Bs->J/psi phi at CMS and ATLAS

The Bs->J/psi phi decay allows to study many properties of the Bs system, such as the difference between the widths of the two weak eigenstates or the CP-violating phase phi_s, and these parameters can show significant deviations due to contributions from non-SM processes. The prospects of the measurement of the width difference with the CMS and the ATLAS detector at the LHC will be presented.

Speaker: Dr Stefan Koenig (Paul Scherrer Institut, 5232 Villigen PSI, Switzerland)

Slides SUSY_2007_V3.1.pdf

15:00 Rare B decays at LHCb

The LHCb experiment will search for New Physics in Bs -> mumu decays using the data collected during the very first physics run of LHC, with a 90% CL exclusion sensitivity down to the SM prediction. The latest expectations, based on MC studies with fully simulated events, will be presented. The LHCb sensitivity to other rare and radiative B decays will also be reviewed.

Speaker: Michela Lenzi (Univ. + INFN)

Paper 0710.5056v1.pdf

Slides SuSyTalk_Lenzi.ppt

15:20 Recent progress on supersymmetric effects in rare K decays

The possibility to constrain the MSSM parameter space using the rare K decays K --> pi nu nubar and KL --> pi0 l+ l- will be illustrated. Particular emphasis will be set on the information one can get from the pattern of deviation the four modes could exhibit with respect to the SM. Specific scenarios considered are, within the MSSM, large and moderate tan(beta), as well as the minimal flavor violation hypothesis. In more general susy models, these modes could also allow for studies of R-parity violating effects. Based on: -- Isidori,Mescia,Paradisi,Smith,Trine, JHEP 0608 (2006) 064 -- Mescia,Smith,Trine, JHEP 0608 (2006) 088.

Speaker: Dr Christopher Smith (University of Bern)

Paper 0710.2883v2.pdf

Proceeding 0710.2883v2.pdf

Slides Smith_SUSY07.pdf

15:40 Flavour symmetries and the SUSY soft-breaking sector: EDMs and FCNCs

The breaking of a Flavour symmetry can explain the observed hierarchy of masses and mixings of the SM fermions. In a supergravity-mediation mechanism of the SUSY breaking, we can expect the soft masses to receive non-universal contributions from the breaking of this flavour symmetry at a high scale. We analyse the effects of these non-universal soft-terms at low energies both in collider and indirect searches. We make special emphasis in FCNC and EDM observables.

Speaker: Oscar Vives (Valencia)

Paper http://arxiv.org/pdf/0710.3705

14:00 → 16:00 Theoretical Models (String Theory and Formal Aspects of SUSY) 6

14:00 Local SUSY-breaking minima in N_f=N_c SCQD?

We revisit N_f=N_c SQCD and its non-supersymmetric minima conjectured by Intriligator, Seiberg and Shih . We argue that the existence of such minima depends on the signs of three non-calculable parameters and that no evidence can be inferred by deforming the theory. We demonstrate this by studying a different deformation of the theory which involves additional gauge singlets. We show that in this case the conjectured minimum is destabilized and comment on the phenomenological consequences of this instability.

Speaker: Mr Andrey Katz (Technion- Israel Institute of Technology)

Paper 0710.0944v1[1].pdf

Slides Andrey_Katz.pdf

14:20 A natural renormalizable model of metastable SUSY breaking

A model of metastable dynamical supersymmetry breaking is presented in which all scales are generated dynamically. The construction is a simple variant of the Intriligator-Seiberg-Shih model. It contains no dimensionful parameters, and does not rely on higher-dimensional operators to generate a small quark mass scale.

Speaker: Mr Felix Bruemmer (Heidelberg University)

Slides ka07.pdf

14:40 O'Raifeartaigh models with spontaneous R-symmetry breaking

O'Raifeartaigh models with general R-charge assignments can have vacua where both supersymmetry and R-symmetry are spontaneously broken. Most of these vacua are metastable because the potential shows a runaway behaviour. We explain the relation between runaway directions and R-symmetry, and we discuss the origin of metastability in these models. Besides, we show models with global symmetries that can play the role of hidden metastable SUSY-breaking sector in theories with gauge mediation or direct mediation.

Speaker: Mr Luca Ferretti (SISSA/ISAS)

Slides ferretti-susy.pdf

15:00 Metastable Dynamical Supersymmetry Breaking near Points of Enhanced Symmetry

We construct a model with long-lived metastable vacua in which all the relevant parameters, including the supersymmetry breaking scale, are generated dynamically by dimensional transmutation. Our model consists of two sectors coupled by a singlet and combines dynamical supersymmetry breaking with an O'Raifeartaigh mechanism in terms of confined variables. The metastable vacua appear along a pseudo-runaway direction near a point of enhanced symmetry as a result of a balance between non-perturbative and perturbative quantum effects. We show that metastable supersymmetry breaking is a rather generic feature near certain enhanced symmetry points of gauge theory moduli spaces.

Speaker: Mr Rouven Essig (Rutgers University)

Paper 0710.4311v1.pdf

Slides SUSY07_RouvenEssig.pdf SUSY07_RouvenEssig.ppt

15:20 Blowups of heterotic orbifolds using toric geometry

Heterotic orbifold models are promising candidates for models with MSSM like spectra. But orbifolds only correspond to a special place in moduli space, the bigger picture is described by the moduli space of Calabi-Yau spaces. In this talk we will make explicit connections between both pictures. To this end we study blowups of orbifold singularities, to this end we use both explicit constructions and toric geometry techniques. We show that matching of all orbifold models in blowups are possible.

Speaker: Dr Stefan Groot Nibbelink (Heidelberg University)

Paper 0708-5.1875.pdf

Slides grootnibbelink.pdf

15:40 Phenomenology of large volume models in type IIB string theory

We review the phenomenologically attractive Large Volume compactifications of Type IIB string theory. Soft terms for a general intersecting magnetised D7 brane MSSM model are computed within this class of compactifications, away from the dilute flux limit. The resulting low energy spectra are found using RG running, including effects of uncertainties due to lack of an explicit MSSM embedding. LHC signatures of the spectra are then analysed, and in favourable circumstances, the models may be discriminated from mSUGRA and mirage mediation models. We also show that aspects of the sparticle spectrum can be accurately reconstructed.

Speaker: Kerim Suruliz (Cambridge)

Slides Suruliz.pdf

16:00 → 16:30 coffee break

16:30 → 18:30 Alternatives 7

16:30 A New Extension of the Standard Model

We propose an extension of the Standard Model by extending the EW symmetry to SU(2)L×U(1)×Z2 and introducing three SU(2)×U(1) singlet right handed neutrinos and an additional Higgs doublet. While the SM gauge bosons and the quarks and charged leptons acquire masses from the spontaneous breaking of SU(2)L × U(1) symmetry at the electroweak scale, the neutrinos acquire masses from the spontaneous breaking of the discrete Z2 symmetry at a scale of 10^(-2) eV. In addition to providing a new mechanism for generating tiny masses for the neutrinos, the model has interesting implications for neutrinoless double beta decay and the Higgs signals at high energy colliders, as well as in astrophysics and cosmology.

Speaker: Prof. Satyanarayan Nandi (Oklahoma State University)

Talk nandi_susy07_talk.pdf.pdf

16:50 Supersymmetry breaking by constant boundary superpotentials in warped space

Supersymmetry breaking by constant superpotentials localized at boundaries is studied in a supersymmetric warped space model. By taking into account of the radion and the compensator supermultiplets, as well as the bulk mass for the hypermultiplet, we show that the radius is stabilized by the presence of the constant boundary superpotentials. We then give the masses of the hypermultiplet, radion, and gravitino and induced soft scalar masses.

Speaker: Dr Nobuhiro Uekusa (University of Helsinki and Helsinki Institute of Physics)

Paper Nobuhiro_UEKUSA_susy07.pdf.pdf

Slides NobuhiroUekusaSUSY07.pdf

17:10 Exotic Isosinglet Quarks and Squarks at the LHC

Extensions of the MSSM often predict the existence of new fermions and their scalar superpartners which are vectorlike with respect to the standard model gauge group but may be chiral under additional gauge factors. In this paper we explore the production and decay of an important example, i.e., a heavy isosinglet charge -1/3 quark and its scalar partner, using the charge assignments of a 27-plet of E_6 for illustration. We emphasize that, depending on the symmetries of the low energy theory, such exotic particles may decay by leptoquark or diquark couplings (which may nevertheless preserve a form of $R$-parity). Such supersymmetric decay chains will compete with -- and often obscure -- the signatures of "standard" MSSM superpartners at the LHC. We demonstrate how to recognize the presence of the exotic superpartners and how well-established SUSY search algorithms for the LHC will need to be modified. [Based on a paper with Paul Langacker of Princeton and Junhai Kang of the Univeristy of Maryland, to appear at the end of May]

Speaker: Prof. Brent Nelson (Northeastern University)

Slides bnelson.pdf

17:30 MPP inspired Two-Higgs Doublet Model

Multiple point principle (MPP) postulates the existence of as many phases with the same energy density as possible, which are allowed by a given theory. Being applied to the non--supersymmetric two-Higgs doublet extension of the Standard Model (SM) MPP leads to the invariance of the quartic part of the Higgs effective potential and Yukawa interactions between Higgs doublets and fermions under Peccei-Quinn symmetry. As a result MPP ensures the CP conservation in the Higgs sector and the absence of flavour changing neutral currents in the considered model. The existence of a large set of degenerate vacua at some high energy scale ($\Lambda$) also results in a few relations between Higgs self-coupling constants which can be examined at future colliders. The numerical analysis reveals that these MPP conditions constrain the mass of the SM--like Higgs boson to lie below 180 GeV for a wide set of the MPP scales $\Lambda$ and $\tan\beta$.

Speaker: Dr Roman Nevzorov (University of Glasgow)

Paper http://arxiv.org/abs/0710.2457 nevzorov_alter_susy07.2457

Slides nevzorov-alternatives.pdf

17:50 Contact Interactions at the LHC

Contact interactions offer a general framework for describing a new interaction with scale above the sqrt(s). These interaction can occur if the SM particles are composite or if new heavy particles are exchanged. We present results in the dimuon and dijet final states employing ratios for startup (100pb-1) and asymptotic reach.

Speaker: Dr Monica Vazquez Acosta (CERN)

Paper 0709.2518v1.pdf

Slides MVA_ContactInteractionsCMSandATLAS.pdf

18:10 Trigger Strategy for Alternative signatures at the LHC

We present trigger methodologies for alternative signatures at the LHC. They include long lived states and mutliobject particle topologies as well as express line triggers for monitoring at startup.

Speaker: Tulika Bose

Slides SUSY07_Tulika.pdf

16:30 → 18:30 Colliders - Susy Phenomenology 10 (Experiment)

Chairperson: Darin ACOSTA

16:30 MSSM precision physics at the Z resonance

LEP1 and SLC measurements provide accurate data for the process $e^+e^- \to f \bar f$ at a centre of mass energy~$s\sim M_Z^2$. This data is used to define various on resonance pseudo observables, such as effective fermionic mixing angles, pole asymmetries, partial and total $Z$~boson decay widths, peak cross sections, and ratios of partial widths. Despite the fact that the experimental errors of these quantities are already below the per mill level, the GigaZ option of a future linear collider will further reduce these error. To match current and future experimental accuracy, equally precise theoretical predictions are indispensable. As the theory predictions depend on model dependent quantum corrections, the comparison of the theory predictions with the experimental data provides a crucial test of models of new physics. In this talk we present the currently most precise and most general MSSM predictions for the observables at the $Z$~resonance. These contain all relevant contributions from Standard Model and MSSM, as well as the full dependence on the complex parameters at one-loop order. Our calculations are performed within an unconstrained MSSM, allowing for detailed studies within any constrained model of phenomenological interest. Comparing our results with the current data we impose constraints on the MSSM parameter space and analyse possible indications for the scale of supersymmetry. We furthermore comment on the prospects and potential improvements at the future LHC and ILC colliders. Arne M. Weber on behalf of S. Heinemeyer, W. Hollik, AMW and G. Weiglein.

Speaker: Mr Arne Weber (MPI for Physics - Munich)

Paper 0710.2982.pdf

Slides ArneweberSUSY07.pdf

16:50 SUSY in the Light of B Physics and Electroweak Precision Observables

Indirect information about the possible scale of SUSY breaking is provided by $B$-physics observables (BPO) as well as electroweak precision observables (EWPO). We combine the constraints imposed by recent measurements of the BR(b -> s gamma), BR(B_s -> mu mu), BR(B_u -> tau nu_tau) and Delta M_B_s BPO with those obtained from the experimental measurements of the MW, sin^2 theta_eff, Gamma_Z, (g-2)_mu and Mh EWPO, incorporating the latest theoretical calculations of these observables within the Standard Model and supersymmetric extensions. We perform a $\chi^2$~fit to the parameters of the constrained minimal supersymmetric extension of the Standard Model (CMSSM) and the non-universal Higgs model (NUHM). Assuming that the lightest supersymmetric particle (LSP) provides the cold dark matter density preferred by WMAP and other cosmological data, we scan over the remaining parameter space. Within the CMSSM, we confirm the preference found previously for a relatively low SUSY-breaking scale, though there is some tension between the EWPO and the BPO. In studies of some specific NUHM scenarios compatible with the cold dark matter constraint we investigate MA-tan_beta planes and find preferred regions that may have values of $\chi^2$ somewhat lower than in the CMSSM. The implications for phenomenology at the Tevatron, the LHC and the ILC are discussed.

Speaker: Dr Georg Weiglein (IPPP, Durham)

Paper 0711-2.0200.pdf

Slides susy07_ehoww.pdf

17:10 Preparing LHC: new constraints from isospin asymmetry in b to s gamma transitions

In preparation for the LHC, it seems essential to constrain as much as possible the new physics parameters. For this purpose, isospin asymmetry in b to s gamma transitions appears as a very restricting observable to explore the supersymmetric parameter space.

Speaker: Nazila Mahmoudi (Mount Allison University)

Paper mahmoudi_0710-4501.pdf

Slides isospin_mahmoudi.pdf.pdf

17:30 Development of a consistent framework for indirect MSSM constraints

Already today, low-energy data from flavour physics experiments, high precision electroweak observables as well as astrophysical data impose strong constraints on many new physics (NP) scenarios. In order to quantify the agreement of a particular NP model with the existing experimental measurements, a consistent set of theory predictions has to be provided. For that reason it is desirable to combine the different calculations into one common "mastercode". At the recent LHC flavour workshop, a collaboration of theorists and experimentalists has been formed to develop a first version of such a common tool. This package currently contains state-of-the-art calculations of low-energy flavour, electoweak, and astroparticle observables in the minimal supersymmetric standard model (MSSM). Using this tool as a foundation, we carry out a comprehensive \chi^2 based extraction of important MSSM parameters. The results of this study indicate that today's experimental data already place tight constraints on the MSSM parameter space. Furthermore, it demonstrates that these constraints can be utilized to significantly facilitate the interpretation of potential LHC/ILC discoveries. In this talk we present the results of this study and outline the design and usage of the developed common "mastercode".

Speakers: Frederic Ronga (CERN), Oliver Buchmuller (CERN)

Slides fronga-susy07-20070731.pdf

17:50 Inverting the LHC with the ILC

We present preliminary results from a survey of the ability of the ILC to distinguish MSSM models which produce almost identical signals at the LHC. We have included a full SM background sample and realistic detector simulation. Since the models we study are chosen essentially at random from the low-energy MSSM parameter space, this is the first such comprehensive survey unconstrained by assumptions about the SUSY breaking mechanism.

Speaker: Ben Lillie (Argonne / U. Chicago, EFI)

Slides Lillie-ILCinv-SUSY07.pdf

16:30 → 18:30 Flavor Physics 8

16:30 Unitarity Triangle analysis beyond the Standard Model: general analysis and constraints on specific models

Using the Unitarity Triangle analysis, generalized to account the presence of physics beyond the Standard Model, we discuss the current model-independent bounds on New Physics contributions to K-Kbar, D-Dbar and Bq-Bqbar (q=d,s) mixing processes. This information is then translated into a lower limit on the probed scale of New Physics. We consider several scenarios, such as a New Physics with generic flavour structure, NMFV, as well as MFV with low, moderate or large values of tanbeta.

Speaker: Dr Maurizio Pierini (CERN)

Slides nputfit_SUSY.pdf

16:50 Searching for new physics using CP conserving and CP violating Bs mixing parameters at Dzero

We present measurements of the three Bs mixing parameters: the mass and width difference between the heavy and light mass eigenstates, Delta M_s and Delta Gamma_s respectively, and the CP violating phase difference between Delta M_s and Delta Gamma_s, phi_s. The results are based on a large data set of proton-antiproton collisions recorded by the Dzero detector operating at the Fermilab Tevatron Collider. The three mixing parameters are extracted from several analyses of both time dependent and time independent samples of Bs decays to flavor specific states such as Ds mu nu and CP eigenstates such as J/psi phi or Ds(*)Ds(*). The Delta M_s measurement can be used primarily to limit the magnitude of new physics contributions from Delta Bs = 2 operators while the combination of the Delta Gamma_s and phi_s measurements can be used to limit the phase of these operators.

Speaker: Mr James Walder (Lancaster University)

Paper walder_james_proc_susy07.pdf

Slides Walder_SUSY07.pdf

17:10 Lifetime Difference and CP Asymmetry in the Bs0 -> J/Psi phi Mode

We report on the progress of the analysis of $B0_s \to J/\psi \phi$ decays to extract the parameters $\Delta \Gamma_s / \Gamma_s$ and $\sin 2 \beta_s$ with the CDF\,II detector. The use of a time-dependent angular analysis can separate the $CP$~eigenstates of the $B0_s$~meson to determine their separate lifetimes. Further tagging of the $B0_s$ meson at time $t=0$ as $B0_s$ or $\bar{B}^0_s$, allows for the analysis of the $CP$ asymmetry, which then yields the $\sin 2 \beta_s$ parameter. The $\Delta \Gamma_s$ measurement is an improved analysis using additional data, neural network selection for better signal/background, and reduced systematic errors.

Speaker: Thomas Kuhr (Institut fuer Theoretische Teilchenphysik)

Paper thomas_kuhr_susy07.pdf

Slides BsDeltaGammaCDF.pdf

17:30 Study of DiMuon Rare Beauty decays with ATLAS and CMS

The LHC experiments will perform sensitive tests of physics phenomena beyond the Standard Model (BSM). Investigation of decays of beauty hadrons represents an alternative approach in addition to direct BSM searches. The ATLAS and CMS efforts concentrate on those B decays that can be selected already at the first and second trigger levels. The most favorable trigger signature will be for B hadron decays with muons in the final state. Using this trigger, ATLAS and CMS will be able to accommodate unprecedentedly high statistics in so called Golden LHC channel Bs->J/ψφ, as well as in the rare decays sector. These are purely di-muon decays, and families of semi-muonic exclusive channels. Already with 1 fb-1 the sensitivity in the di-muon channels will be comparable to today worlds statistics. The strategy is to carry on the di-muon channel programme up to nominal LHC luminosity. In particular the Bs→μμ signal with 4.3 sigma significance can be measured combining low luminosity samples with those of one year of LHC operation at a luminosity of 10^34cm-2 s-1. This precision allows excluding or confirming the SM unambiguously.

Speaker: Antonio Policicchio (Universita degli Studi della Calabria)

Paper arXiv0710-1206.pdf

Slides policicchio_susy07.pdf

17:50 Time-dependent CP asymmetries in Bs decays at LHCb

The LHCb experiment will search for New Physics in Bs mixing, notably through the measurement of the Bs mixing phase from the time-dependent CP asymmetry in exclusive Bs decays governed by the b ->ccbar s quark-level transition. Large New Physics effects can be discovered or excluded with the data collected during the very first physics run of LHC. The latest expectations, based on MC studies with fully simulated events, will be presented. The LHCb sensitivity to other CP-violating observables in Bs decays will be reviewed.

Speaker: Johan Blouw (Max-Planck-Institut fuer Kernphysik (MPI))

Paper blouw.pdf blouw_susy07.pdf

Slides blouw.pdf

18:10 Prospects for a high-luminosity Super B Factory

Conceptual designs for very high luminosity asymmetric energy e+e- flavor factories have been advanced by a group centered at KEK (Super KEKB) and by an international collaboration sponsored by INFN Italy (SuperB). These facilities would provide up to a factor of 100 larger data samples than available from the current round of B Factories at SLAC and KEK. The primary physics motivation for Super B Factories is to use precision flavor physics measurements as a complementary tool to the LHC for exploring the quark and lepton flavor couplings of new physics at the TeV mass scale, including Supersymmetry. This talk will review existing proposals for Super B Factories, with a focus on the physics motivation of exploring Supersymmetry or other New Physics phenomena in the era of the LHC.

Speaker: Maurizio Pierini (CERN)

Slides nputfit_SUSY.pdf

16:30 → 18:30 Theoretical Models (String Theory and Formal Aspects of SUSY) 7

16:30 Effective Action of Domain Wall Networks

Domain walls have been useful to construct models of brane-world. We study composite system of domain walls forming junctions and netwroks. U(NC) gauge theory with NF fundamental scalars admits BPS junctions of domain walls. When the networks/webs of these walls contain loops, their size moduli give localized massless modes. We construct K"ahler potential of their effective action. In the large size limit K"ahler metric is well approximated by kinetic energy of walls and junctions, which is understood in terms of tropical geometry. K"ahler potential can be expressed in terms of hypergeometric functions which are useful to understand small size behavior.Even when the loop shrinks, the metric is regular with positive curvature. Moduli space of a single triangle loop has a geometry between a cone and a cigar.

Speaker: Prof. Norisuke Sakai (Tokyo Institute of Technology)

Paper 0710.0423v1.pdf

Slides 7072sus.pdf

16:50 Deformation of Dijkgraaf-Vafa Relation via Spontaneously Broken N=2 Supersymmetry

It is known that the fermionic shift symmetry of the N=1, U(N) gauge model with a superpotential of an adjoint chiral superfield is replaced by the second (spontaneously broken) supersymmetry in the N=2, U(N) gauge model with a prepotential and Fayet-Iliopoulos parameters. Based on a diagrammatic analysis, we demonstrate how the well-known form of the effective superpotential in the former model is modified in the latter. A set of two equations on the one-point functions stating the Konishi anomaly is modified accordingly.

Speaker: Mr Kazunobu Maruyoshi (Osaka City University)

Paper 0710.2154v1.pdf

Slides maruyoshiSUSY07.pdf maruyoshiSUSY07.ppt

17:10 Instantons in deformed supersymmetric gauge theories

Recently, non-perturbative effects in supersymmetric gauge theories are intensively investigated by the help of closed string backgrounds. Especially, the graviphoton background is used to calculate the instanton partition function in N=2 super Yang-Mills (SYM) theory. The deformed ADHM construction of instantons is quite efficient tool for the investigation of non-perturbative effect in SYM theories. The deformation of ADHM construction is naturally understood in terms of D3/D(-1) -brane system in the presence of Ramond-Ramond (graviphoton) background. We investigate deformed instanton equations in N=4, N=2 supersymmetric gauge theories with graviphoton background. The deformed ADHM construction is derived from the deformed SYM theories by purely field theory calculation. We will show the deformed instanton effective action of N=4 SYM theory is consistent with the one obtained in N=2 SYM theory.

Speaker: Dr Shin Sasaki (University of Helsinki)

Paper SUSY07proceeding_ssk3.pdf

Slides SUSY07ssk.pdf SUSY07ssk.ppt

17:30 Higher Derivative Corrections in M-theory via Local Supersymmetry

Higher derivative terms in M-theory are investigated by applying the Noether method. Cancellation of variations under the local supersymmetry is examined to the order linear in $F$ by a computer program. Structure of $R^4$ terms is uniquely determined and exactly matches with one-loop effective terms in type IIA superstring theory. A part of $R^3F^2$ terms is also determined.

Speaker: Dr Yoshifumi HYAKUTAKE (Department of Physics, Osaka University)

Paper 0710.2673v1.pdf

Slides SUSY07.pdf SUSY07.ppt

17:50 Counting BPS Solitons and Applications

We propose a novel and simple method to compute the partition function of statistical mechanics, or the volume of the moduli space of BPS vortices in supersymmetric gauge theory. We use a D-brane realization of the vortices and T-duality relation to domain walls. We there use a special limit where domain walls reduce to gas of hard (soft) one- dimensional rods for Abelian (non-Abelian) cases. In the simpler cases of the Abelian-Higgs model on a torus, our results agree with exact results which are geometrically derived by an explicit integration over the moduli space of vortices. In other side of the limit, we can compute the volume of the moduli space in the combinatorial way, where the problem on the random (plane) partition appears as well as the four dimensional instanton calculus. We also discuss an application of these countings to non-perturbative dynamics of supersymmetric (lattice) gauge theory.

Speaker: Dr Kazutoshi Ohta (Physics Department, Graduate School of Science, Tohoku University)

Paper http://arxiv.org/pdf/0710.4011 Kazutoshi_Ohta_susy07.pdf

Slides KazutoshiOhta-SUSY07.pdf

20:00 → 23:59 Conference Dinner

Click here for further information.

Wednesday, 1 August

09:00 → 10:25 Plenary Session

09:00 DM Candidates

Speaker: Frank Daniel Steffen

Paper 0711-4.1240.pdf

Slides steffen_f_SUSY07_310707.pdf

09:30 Direct DM Searches

Speaker: Laura Baudis

more information readme.pdf

Paper baudis_0711.3788.pdf

Slides baudis_susy07.pdf

10:00 Indirect DM Searches

Speaker: Dan Hooper

Paper 0710.2062.pdf

Slides

• danhooper.ppt.pdf
• danhooper.ppt.ppt
• slides

10:30 → 11:00 coffee break

11:00 → 13:30 Plenary Session

11:00 Extra Dimensions

Speaker: Benjamin Lillie

Slides lillie-SUSY07.pdf

11:30 Outlook

Speaker: John Ellis

Paper ellis.pdf

Slides ellisSusy07.pdf ellisSusy07.ppt

12:15 SUSY08

Slides SUSY08.pdf SUSY08.ppt