Planck 2014

26 May 2014, 08:00 → 30 May 2014, 19:00 Europe/Paris

Institut des Cordeliers - Paris

Planck 2014

17th International Conference From the Planck Scale to the Electroweak Scale

Institut des Cordeliers, Paris, France
26 - 30 May 2014

 

The conference was organized by CPhT Polytechnique, IPhT Saclay and LPTHE Jussieu for a network consisting of several European research groups: Bonn, CERN, Trieste, Madrid, Oxford, Padua, Paris and Warsaw, as well as the ERC Grant 'MassTeV'.

Monday, 26 May

08:30 → 09:30 Registration

09:30 → 10:30 Plenary

Conveners: Emilian Adoni Dudas (Ecole Polytechnique (FR)), Hervé Partouche (Ecole Polytechnique), Marco Cirelli (IPhT CNRS/CEA Saclay), Stephane Lavignac (CEA/IRFU,Centre d'etude de Saclay Gif-sur-Yvette (FR)), karim benakli (LPTHE)

09:30 The Stability of the Electroweak Vacuum

TBA

Speaker: Jose Espinosa (Departm.of Physics & Astronomy)

Slides 1.Planck14Espinosa.pdf intro_slides.pdf

10:00 Agravity

Speaker: Alessandro Strumia (Nat. Inst. of Chem.Phys. & Biophys. (EE))

Slides 2014-agravity.pdf

10:30 → 11:00 Coffee Break

11:00 → 12:30 Plenary

Conveners: Emilian Adoni Dudas (Ecole Polytechnique (FR)), Hervé Partouche (Ecole Polytechnique), Marco Cirelli (IPhT CNRS/CEA Saclay), Stephane Lavignac (CEA/IRFU,Centre d'etude de Saclay Gif-sur-Yvette (FR)), karim benakli (LPTHE)

11:00 Testing the Higgs boson through pair production

TBA

Speaker: Roberto Contino (Ecole Polytechnique Federale de Lausanne (CH))

Slides contino_Planck2014-short.pdf

11:30 Exotic Higgs Decays

Speaker: Adam Falkowski (Universite de Paris-Sud 11 (FR))

Slides 3.Falkowski.pdf

12:00 Implications of the Higgs signal for BSM physics

Speaker: Georg Ralf Weiglein (Deutsches Elektronen-Synchrotron (DE))

Slides Weiglein.pdf

14:30 → 16:00 Plenary

Convener: Mr Fabio Zwirner (Universita e INFN (IT))

14:30 Pre -- Inflationary Clues from String Theory ?

Speaker: Augusto Sagnotti (Sezione di Pisa (IT))

Slides PLANCK_2014_Sagnotti.pptx

15:00 Theory and Cosmology of Massive Gravity and Beyond

TBA

Speaker: Gregory Gabadadze (Unknown)

Slides 2.Gabadadadze.pdf

15:30 Global F-theory models with U(1) symmetries

Speaker: Sakura Schafer-Nameki (K)

Slides 3.Schaefer-Nameki.pdf

16:00 → 16:30 Coffee Break

16:30 → 17:30 Plenary

Convener: Mr Fabio Zwirner (Universita e INFN (IT))

16:30 Aligned Natural Inflation

Speaker: Hans Peter Nilles (Univ. Bonn)

Slides Nilles.pdf

17:00 Mimetic Cosmology

TBA

Speaker: Slava Mukhanov

Slides 5.MukhanovPlanck2014.pdf

17:30 → 19:30 Social Event: Welcome Reception

Tuesday, 27 May

09:00 → 10:30 Plenary

Convener: Wilfried Buchmuller (DESY)

09:00 Scalar dark matter

Speaker: Genevieve Belanger (LAPP Annecy)

Slides Bélanger.pdf

09:30 Indirect Dark Matter detection: Tales of scales

Speaker: Pasquale Serpico (Unite Reseaux du CNRS (FR))

Slides 1405PlanckSerpico.pdf

10:00 Baryogenesis from strong CP violation and the QCD axion

Speaker: Geraldine Servant (ICREA - Institucio catalana de recerca estudis avancats (ES))

Slides Servant_Planck_2014.pdf

10:30 → 11:00 Coffee Break

11:00 → 12:30 Plenary

Convener: Wilfried Buchmuller (DESY)

11:00 Neutrinos, Dark Matter and the Planck satellite

Speaker: Julien Lesgourgues (Ecole Polytechnique Federale de Lausanne (CH))

Slides Lesgourgues.pdf

11:30 Hunting Down the Origin of Neutrino Masses: from Sterile Neutrinos to Baryon Number Violation

Speaker: Andre De Gouvea (Northwestern University)

Slides de_Gouvea.pdf

12:00 New Physics Effects in Anomalous Gauge Boson Couplings

Speaker: Gero Freiherr Von Gersdorff

Slides 6.Gersdorff.pdf

14:30 → 16:10 Composite higgs

Convener: Adam Falkowski (Universite de Paris-Sud 11 (FR))

14:30 UV descriptions of composite Higgs models without elementary scalars

I will discuss four-dimensional UV descriptions of composite Higgs models without elementary scalars, in which four-fermion interactions are introduced to an underlying gauge theory like the gauged NJL model. When the anomalous dimension of the fermion bilinear is large, these interactions drive the spontaneous global symmetry breaking in the model, with the Higgs identified as a Nambu-Goldstone boson. The UV descriptions support composite top partner operators, also with large anomalous dimensions, thereby providing an explicit realisation of the idea of partial compositeness. As an example I will discuss the UV completion of the composite SO(6)/SO(5) model. Possibility of generalizing to other cosets will be discussed.

Speaker: Dr Tirtha Sankar Ray (University of Melbourne)

Slides planck_14_tsray.pdf

14:50 Top FCNC in composite Higgs models.

I will discuss the top flavour violation in composite Higgs models. The talk will be focused on the $t\rightarrow z c$ decay. We will show that even in the models with custodial protection for the $Z\bar b b$ coupling the arguments of the naturalness of the electroweak symmetry breaking scale lead to the observable branching ratio for this decay mode. At last I will discuss the current constraints and the future prospects on the top flavor violating decay mode from LHC.

Speaker: Mr Aleksandr Azatov (CERN)

Slides planck14_aa.pdf

15:10 Flavour of 4D Composite Higgs

We discuss the flavour physics constraints on the Composite Higgs models formulated in the purely four-dimensional framework, together with the constraints coming from the electroweak precision tests. Our approach aims at the full exploration of the implications of the Goldstone nature of the Higgs boson, using concrete calculable models and a more general effective field theory description. Resulting bounds differ significantly from the ones obtained for a non-Goldstone composite Higgs boson.

Speaker: Oleksii Matsedonskyi (I)

Slides planck_2014_2.pdf

15:30 Dipole operator constraints on composite Higgs models

Flavour- and CP-violating electromagnetic or chromomagnetic dipole operators in the quark sector are generated in a large class of new physics models and are strongly constrained by measurements of the neutron electric dipole moment and observables sensitive to flavour-changing neutral currents, such as the $B\to X_s\gamma$ branching ratio and $\epsilon'/\epsilon$. We analyze these effects in models with partial compositeness, where the quarks get their masses by mixing with vector-like composite fermions. These scenarios can be seen as the low-energy limit of composite Higgs or warped extra dimensional models. We study different choices for the electroweak representations of the composite fermions motivated by electroweak precision tests as well as different flavour structures, including flavour anarchy and $U(3)^3$ or $U(2)^3$ flavour symmetries in the strong sector. In models with "wrong-chirality" Yukawa couplings, we find a strong bound from the neutron electric dipole moment, irrespective of the flavour structure. In the case of flavour anarchy, we also find strong bounds from flavour-violating dipoles, while these constraints are mild in the flavour-symmetric models.

Speaker: Matthias König

Paper http://arxiv.org/pdf/1403.2756v2

Slides Slides for my talk "Dipole operator constraints on composite Higgs model".

15:50 Light Non-degenerate Composite Partners at the LHC

We study the implications of a large degree of compositeness for the light generation quarks in composite pseudo-Nambu-Goldstone-boson Higgs models. We focus in particular on viable scenarios where the right-handed up-type quarks have a sizable mixing with the strong dynamics. For concreteness we assume the latter to be characterized by an SO(5)/SO(4) symmetry with fermionic resonances in the SO(4) singlet and fourplet representations. Singlet partners dominantly decay to a Higgs boson and jets. As no dedicated searches are currently looking for these final states, singlet partners can still be rather light. Conversely, some fourplet partners dominantly decay to an electroweak gauge boson and a jet, a signature which has been analyzed at the LHC. To constrain the parameter space of this scenario we have reinterpreted various LHC analyses. In the limit of first two generation degeneracy, as in minimal flavor violation or U(2)-symmetric flavor models, fourplet partners need to be relatively heavy, with masses above 1.8 TeV, or the level of compositeness needs to be rather small. The situation is rather different in models that deviate from the first two generation degeneracy paradigm, as the charm parton distribution functions are suppressed relative to the up quark ones. The right-handed charm quark can be composite and its partners being as light as 600 GeV, while the right-handed up quark needs either to be mostly elementary or to have its partners as heavy as 2 TeV. Models with fully composite singlet fermions are also analyzed, leading to similar conclusions. Finally, we consider the case where both the fourplet and the singlet states are present. In this case the bounds could be significantly weaken due to a combination of smaller production rates and the opening of new channels including cascade processes.

Speaker: Thomas Flacke (KAIST)

Slides FlackePlanck2014.pdf

14:30 → 16:10 Dark Matter

Convener: Celine Boehm

14:30 The Cluster Soft X-ray Excess from a Cosmic Axion Background

Observations have revealed diffuse excess emission in a large number of galaxy clusters in the ~200 eV soft X-ray band: the Cluster Soft X-ray Excess. In this talk I will discuss how a primordially generated background of relativistic axion-like particles can explain this puzzling feature of galaxy cluster observations. Such a background is generically predicted to be produced from the decays of string moduli fields in the early universe, and can form the Dark Radiation component of the universe, of which there a tentative hints. The conversion of these cosmic axions in the magnetic fields of galaxy clusters can give rise to the Cluster Soft Excess. Here I will discuss how simulations of cluster magnetic fields can be used to compare the predicted and observed morphology of soft X-rays across several clusters. The simulations can also be used to constrain the axion-photon coupling and the energy of the Cosmic Axion Background spectrum.

Speaker: Mr Andrew J Powell (University of Oxford)

Slides 1.Powell.pdf

14:50 A 3.55 keV Photon Line and its Morphology from a 3.55 keV ALP Line

Galaxy clusters can efficiently convert axion-like particles (ALPs) to photons. We propose that the recently claimed detection of a 3.55--3.57 keV line in the stacked spectra of a large number of galaxy clusters and the Andromeda galaxy may originate from the decay of either a scalar or fermionic $7.1$ keV dark matter species into an axion-like particle (ALP) of mass $m_{a} < 6\cdot 10^{-11}~{\rm eV}$, which subsequently converts to a photon in the cluster magnetic field. In contrast to models in which the photon line arises directly from dark matter decay or annihilation, this can explain the anomalous line strength in the Perseus cluster. As axion-photon conversion scales as $B^2$ and cool core clusters have high central magnetic fields, this model can also explain the observed peaking of the line emission in the cool cores of the Perseus, Ophiuchus and Centaurus clusters, as opposed to the much larger dark matter halos. We describe distinctive predictions of this scenario for future observations.

Speaker: Markus Rummel

Slides Planck_May2014.pdf

15:10 Predictions for a 3.55 keV photon line from dark matter decay to axions in the Milky Way

I describe predictions for Milky Way halo dark matter decay to 3.55 keV axion like particles (ALPs) followed by ALP to photon conversion in the Milky Way's magnetic field. A scenario in which the 3.55 keV line observed in galaxy clusters and Andromeda is caused by dark matter decay to ALPs, which then mix with the photon in astrophysical magnetic fields is particularly well-motivated by the observed morphology of the 3.55 keV flux. The Milky Way's magnetic field is highly asymmetric about the galactic centre, and so the 3.55 keV flux morphology in the ALP scenario differes significantly from that expected if the dark matter decays directly to photons. I also examine this phenomenon in Andromeda, and give predictions for the 3.55 keV line flux from the Milky Way and Andromeda in the ALP scenario.

Speaker: Francesca Day (University of Oxford)

Slides Planck_FDay.pdf

15:30 The 3.5 keV X-ray line from decaying gravitino dark matter

In supersymmetric models with R-parity violation, the gravitino is a natural dark matter candidate. The gravitino can also naturally be very light, opening for the possibility of being warm dark matter as well as explaining the recently claimed 3.5 keV X-ray line from the XMM-Newton telescope. We show that loops induced by trilinear lepton number violating couplings can indeed give a good explanation for this X-ray signature, while still remain compatible with early universe cosmology as well as constraints on R-parity violating couplings. Furthermore, the above scenario indicates a rich LHC phenomenology, with multi-jet and/or multi-lepton final states from neutralinos or gluinos decaying through aforementioned lepton number violating couplings.

Speaker: Dr Nils-Erik Bomark (NCBJ, Warsaw)

Slides pres.pdf

15:50 Generating X-ray lines from annihilating dark matter

In this talk, I will present new results about the recently observed X-ray line in different galaxy clusters. I will expose different scenarios where a keV dark matter annihilates to produce a monochromatic signal. The process is generated through the exchange of a light scalar of mass of order 300 keV - 50 MeV coupling to photon through loops or higher dimensional operators. For natural values of the couplings and scales, the model can generate a gamma-ray line which can fit with the recently identified 3.5 keV X-ray line.

Speaker: Lucien Heurtier (C)

Slides Heurtier-Planck2014.pdf

14:30 → 16:10 Flavor: and Neutrinos

Convener: Andre De Gouvea (Northwestern University)

14:30 Large Leptonic Mixing and Quasi-degenerate Neutrinos

TBA

Speaker: Daniel Wegman (IST, Lisboa)

Slides Planck_2014.odp Planck_2014.ppt

14:50 The Majorana nature of massive neutrinos as a possible hint for new physics

Determining the nature - Dirac or Majorana - of massive neutrinos, possibly related to a New Physics scale beyond that predicted by the Standard Model is a fundamental problem under study. Significant experimental efforts have been made to unveil the possible Majorana nature of massive neutrinos by searching for neutrinoless double beta decay with increasing sensitivity. These constraints, together with the results from beta-decay experiments and in light of the recent (and future) cosmological observations can be combined in order to extract information on new possible couplings in the Lagrangian of particle interactions, changing the total lepton charge $L=L_e + L_\mu + L_\tau$ by two units. Further if it will be experimentally established the Majorana nature of massive neutrinos, via the observation of the neutrinoless double beta-decay, it will be possible to test the compatibility of the usual 3-neutrino scenario with the possible existence of 1 or 2 additional sterile neutrino states with masses at the eV scale (the so called 3+1 and 3+2 schemes) and to study the implications of all this on the general properties of the neutrino mass matrix. Works: JHEP 1302 (2013) 025, JHEP 1311 (2013) 146, Phys. Rev. D 89, 053009 (2014)

Speaker: Aurora Meroni (U)

Slides talk.pdf

15:10 Effect of sterile states on lepton dipole moments

We investigate the contribution of sterile states to the anomalous magnetic and electric dipole moments of charged leptons. Furthermore, as a specific example, we study this effect in a low-scale seesaw model. We perform a complete numerical study scanning the relevant parameter space of the models.

Speaker: Valentina De Romeri (C)

Slides PLANCK14_DeRomeri.pdf

15:30 Dark $\theta_{13}$, Leptogenesis and Inflation

In the context of the type-I seesaw mechanism, when there is an underlying discrete flavor symmetry, such as $\mu-\tau$ symmetry at work, $\theta_{13}$ in the active neutrino mixing matrix is zero and leptogenesis can not work since there are no complex phases in the heavy-light neutrino mixing. In this work, we demonstrate that the existence of dark matter, which violates the flavor symmetry, renders $\theta_{13}$ non-zero via radiative corrections and provides the complex phase(s) needed for leptogenesis. We also briefly comment on possibilities of explaining BICEP$2$ results based on inflation.

Speaker: Wei-Chih Huang (University College London)

Slides dark_13_lep_inf.pdf

15:50 CP Violation from Discrete (Flavor) Symmetries

This talk aims to give a comprehensive introduction to the topic of CP in theories with discrete (flavor) symmeries. I will argue that consistent physical CP transformations are precisely those transformations, which map group representations to their complex conjugate. In this context, generalizing CP symmetries is not some additional feature but a mere necessity. I will present mathematical tools, new to this context, to decide whether groups allow for consistent CP transformations and comment on the close relation to real Clebsch-Gordan coefficients. I will show examples for groups which, in general, are incompatible with CP transformations. In generic settings based on such groups CP violation is a consequence of the flavor symmetry and its magnitude is predictable.

Speaker: Andreas Trautner (TU Muenchen)

Slides PLANCK_Talk_trautner.pdf

14:30 → 16:10 Higgs stability and SuSy

Convener: Thomas Gregoire (Carleton University)

14:30 BSM physics seen trough higher order terms in the SM scalar potential

based on arXiv:1402.3826 [hep-ph] by Z. Lalak, M. Lewicki and P. Olszewski plus follow-up research to appear. abstract of published work: Investigation of the structure of the Standard Model effective potential at very large field strengths opens a window towards new phenomena and can reveal properties of the UV completion of the SM. The map of the lifetimes of the vacua of the SM enhanced by nonrenormalizable scalar couplings has been compiled to show how new interactions modify stability of the electroweak vacuum. Whereas it is possible to stabilize the SM by adding Planck scale suppressed interactions and taking into account running of the new couplings, the generic effect is shortening the lifetime and hence further destabilisation of the SM electroweak vacuum. These findings have been illustrated with phase diagrams of modified SM-like models. It has been demonstrated that stabilisation can be achieved by lowering the suppression scale of higher order operators while picking up such combinations of new couplings, which do not deepen the new minima of the potential. Our results show the dependence of the lifetime of the electroweak minimum on the magnitude of the new couplings, including cases with very small couplings (which means very large effective suppression scale) and couplings vastly different in magnitude (which corresponds to two different suppression scales).

Speaker: Prof. Zygmunt Lalak (University of Warsaw)

Slides LalakPlanck2014.pdf

14:50 Anomalous Higgs couplings in gluon-fusion double Higgs production

We will present the recent progress on a model-independent estimate of the LHC potential to detect anomalous Higgs couplings in gluon-fusion double Higgs production. Our estimate of the sensitivity at 100 TeV collider will be presented as well if time is allowed.

Speaker: Minho Son (EPFL)

Slides 2.Son.pdf

15:10 A Fake Split-Supersymmetry Model for the 126 GeV Higgs

We consider a scenario where supersymmetry is broken at a high energy scale, out of reach of the LHC, but leaves a few fermionic states at the TeV scale. The particle content of the low-energy effective theory is similar to that of Split Supersymmetry. However, the gauginos and higgsinos are replaced by fermions carrying the same quantum numbers but having different couplings, which we call fake gauginos and fake higgsinos. We study the prediction for the light-Higgs mass in this Fake Split-SUSY Model (FSSM). We find that, in contrast to Split or High-Scale Supersymmetry, a 126 GeV Higgs boson is easily obtained even for arbitrarily high values of the supersymmetry scale $M_S$. For $M_S > 10^8$ GeV, the Higgs mass is almost independent of the supersymmetry scale and the stop mixing parameter, while the observed value is achieved for tan $\beta$ between $1.3$ and $1.8$ depending on the gluino mass.

Speaker: Luc Darmé (UPMC Paris 6)

Slides Darme_Planck2014.pdf

15:30 Natural Supersymmetry Breaking with Meta-stable Vacua

We construct a natural supersymmetry breaking model, with light third generation squarks and small radiative corrections to the Higgs up soft mass, by identifying flavour gauge messengers with magnetic quark superfields of $\mathcal{N}=1$ Supersymmetric QCD. Although these models of flavour and supersymmetry breaking are strongly coupled, through Seiberg duality we have a calculable and predictive scenario of natural supersymmetry. In this identification, the flavour breaking scale is identified with the magnetic quark vev. Supersymmetry breaking in a gauged $SU(3)_F$ flavour sector arises dynamically and in combination with the NMSSM and usual gauge mediation can generate light third generations squarks whilst keeping first and second generations above exclusions. We show that dynamical supersymmetry breaking in a long-lived meta-stable vacuum is not only phenomenologically viable but also \emph{natural} when extended to include flavour gauge mediation, and may help to explain the flavour structure of the MSSM. The Yukawa and CKM matrices arise from piece-wise Higgsing of the magnetic quarks. This setup implies that the flavour hierarchies may emerge dynamically from the various scales of magnetic SQCD. Their simplicity suggests that \emph{natural} supersymmetry (breaking) may be more generic in the landscape of string vacua than previously thought.

Speaker: Dr Moritz McGarrie (DESY)

Slides Planck.pdf

15:50 Peccei-Quinn symmetry from anomalous U(1) gauge symmetry

Axion, a very light pseudo-Goldstone boson is motivated by resolving the strong CP problem and has been a subject of phenomenological interest. For it to exist, we need a global symmetry, Peccei-Quinn symmetry. In this talk, we consider a case where this global symmetry is a remnant of an anomalous U(1) gauge symmetry and its breaking is related to the supersymmetry breaking. It explains intermediate breaking scale natulally, and also has deep imlications in the generalized NMSSM and inflationalry cosmology. We discuss these two in light of recent observations from collider and satellite.

Speaker: Dr Min-Seok Seo (Institute for Basic Science)

Slides msseoPlanck2014.pdf msseoPlanck2014.pptx

16:10 → 16:40 Coffee Break

16:40 → 18:00 Composite higgs

Convener: Adam Falkowski (Universite de Paris-Sud 11 (FR))

16:40 Disentangling a dynamical Higgs

One of the most compelling questions following the Higgs discovery is whether this new particle is an elementary or a composite one. We present a promising way to shed light on this issue, adopting a model-independent, effective approach. Comparing, at first order in the expansions, a non-linear effective Lagrangian for a light dynamical Higgs with a linear effective Lagrangian, we identify the main low-energy signals that differentiate the two scenarios. The study is restricted to the bosonic sector (gauge and gauge-Higgs couplings) and focuses on CP even effects. The results are based on arXiv: hep-ph/1311.1823 .

Speaker: Ilaria Brivio (Universidad Autónoma de Madrid)

Slides Brivio_DisentanglingADynamicalHiggs.pdf

17:00 Fine Tuning in the Holographic Minimal Composite Higgs Model

In the minimal composite Higgs model (MCHM), the size of the Higgs mass and vacuum expectation value is determined, via the Higgs potential, by the size of operators that violate the global SO(5) symmetry. In 5D holographic realisations of this model, this translates into the inclusion of brane localised operators. However, the inclusion of all such operators results in a large and under-constrained parameter space. In this talk I will discuss the level of fine-tuning involved in such a parameter space, focusing on the MCHM${}_5$. It is demonstrated that the gauge contribution to the Higgs potential can be suppressed by brane localised kinetic terms, but this is correlated with an enhancement to the S parameter. While the fermion contribution can be enhanced or suppressed. However this does not significantly improve the level of fine tunings, since the Higgs squared term, in the potential, requires a cancellation between the fermion and gauge contributions.

Speaker: Paul Archer (M)

Slides Archer_Planck2014.pdf

17:20 Fine-Tuning in Non-Custodial Composite Higgs Models

Recently it has been shown that in composite Higgs models where, in the 5D framework, the metric significantly deviates from AdS in the IR, it is possible to obtain viable electroweak oblique parameters without imposing custodial symmetry. We construct a gauge-Higgs model that mimics the essential features of these modified AdS models—enabling full calculational control—and examine the full-tuning in this scenario.

Speaker: Dr Nicholas Setzer (Universidad de Granada)

Slides Fine Tuning in Non-Custodial Composite Higgs

17:40 Supersymmetry with a pNGB Higgs and Partial Compositeness

We study the consequences of combining SUSY with a pseudo Nambu-Goldstone boson Higgs coming from an $\mbox{SO}(5)/\mbox{SO}(4)$ coset and “partial compositeness”. In particular, we focus on how electroweak symmetry breaking and the Higgs mass are reproduced in models where the symmetry $\mbox{SO}(5)$ is linearly realized. While the stops are generally heavy, light fermion top partners below $1$ TeV are predicted. In contrast to what happens in non-SUSY composite Higgs models, they are necessary to reproduce the correct top, rather than Higgs, mass. En passant, we point out that, independently of SUSY, models where $t_R$ is fully composite and embedded in the $5$ of $\mbox{SO}(5)$ generally predict a too light Higgs.

Speaker: Alberto Parolini (S)

Slides Parolini_Planck_2014.pdf

16:40 → 18:00 Dark Matter

Convener: Celine Boehm

16:40 Direct dark matter search with DarkSide at Gran Sasso

DarkSide-50 (DS-50) at Gran Sasso underground laboratory, Italy, is a direct dark matter detector based on a TPC with underground liquid argon. DS-50 is in data taking since Nov 2013, collecting more than 2e7 events with atmospheric argon. Based on the present exposure DS-50 has shown to be a "background-free" experiment for direct dark matter search. DS-50 TPC is installed inside an active neutron veto based on a boron-loaded organic scintillator. The neutron veto is built inside a water cherenkov muon veto. The detector design and performance will be presented as well as results obtained with collected data in terms of figure- of-merit for background rejection. We will show the WIMPs sensitivity with the present statistics and with projected exposure. The production of underground argon and detector design will be reported. DS-50 aims to take data for three years and reach a sensitivity at the level of 1e-45 cm2 in the WIMP-nucleon cross section by using underground argon and about 45kg fiducial volume. DS-50 could be turned into a ton-scale detector within the same neutron veto vessel. Long term planning will be presented.

Speaker: Davide Franco (C)

Slides 6.Franco.pdf

17:00 Isospin-violating dark matter from a double portal

I will discuss a simple model that can give rise to isospin-violating interactions of Dirac fermion asymmetric dark matter to protons and neutrons through the interference of a scalar and U(1)′ gauge boson contribution. The model can yield a large suppression of the elastic scattering cross section off certain elements relative to others thus highlighting the need for the construction of different direct detection experiments utilizing different detector materials and experimental techniques.

Speaker: Dr Andreas Goudelis (LAPTh (CNRS))

Slides 7.Goudelis.pdf

17:20 The Cosmic Ray Antiproton Background for AMS

The AMS-02 experiment is currently performing a high precision measurement of the cosmic ray antiproton flux. The identification of a possible signal from dark matter requires a thorough understanding of the secondary background arising cosmic ray spallations on the interstellar matter. In this light, we perform a reevaluation of the secondary source term using newly available experimental data from scattering experiments. We systematically account for isospin effects as well as the production of antiprotons via strange hyperon decay. After propagation, we obtain an updated prediction for the secondary antiproton flux which includes a realistic assessment of the particle physics uncertainties down to lowest energies.

Speaker: Dr Martin Winkler (DESY)

Slides talk.pdf

17:40 Warm and cold fermionic dark matter via freeze-in

The freeze-in mechanism of dark matter production provides a simple and intriguing alternative to the WIMP paradigm. In this talk, I show that freeze-in can be used to account for the dark matter in the so-called singlet fermionic model. In it, the SM is extended with only two additional fields, a singlet scalar that mixes with the Higgs boson, and the dark matter particle, a fermion assumed to be odd under a Z_2 symmetry. After numerically studying the generation of dark matter, I analyze the dependence of the relic density with respect to all the free parameters of the model. These results are then used to obtain the regions of the parameter space that are compatible with the dark matter constraint. We demonstrate that the observed dark matter abundance can be explained via freeze-in over a wide range of masses extending down to the keV range. As a result, warm and cold dark matter can be obtained in this model. It is also possible to have dark matter masses well above the unitarity bound for WIMPs.

Speaker: carlos yaguna (Muenster University)

Slides planck.pdf

16:40 → 18:00 Flavor: and Neutrinos

Convener: Andre De Gouvea (Northwestern University)

16:40 Origin of Radiative Neutrino Masses and Its Collider Phenomenology

To unravel the mystery of neutrino masses and mixing angles, we adopt a bottom-up approach based on effective operators which violates the lepton number by 2 units. By opening the effective operators, we can find the corresponding minimal UV completion. An example based on dimension-9 operator is presented and its flavor physics is studied in detail. We also discuss the collider phenomenology of these radiative neutrino mass models.

Speaker: Yi Cai

Slides cai.pdf

17:00 Neutrino Masses and Conformal Symmetry

In order to explain the large scale separation between the scale of electro weak symmetry breaking (EWSB) and the Planck scale we argue for a class of models where the EWSB scale is generated purely radiatively. This means we deal with single scale theories where the spontaneous symmetry breaking scale is set entirely by the particle content. We argue that purely from hard facts of particle physics, namely the existence of neutrino masses extensions of the standard model (SM) are unavoidable. We classify and study which models can lead to the observed neutrino mass phenomenology and at the same time provide a radiatively generated Higgs mass of the correct magnitude.

Speaker: Juri Smirnov (M)

Slides

• Mass_Talk.key
• Mass_Talk.pdf
• Mass_Talk.ppt

17:20 Precision tests of unitarity in leptonic mixing

In the light of the recent LHC data, we study precision tests sensitive to the violation of lepton universality, in particular the violation of unitarity in neutrino mixing. Keeping all data we find no satisfactory fit, even allowing for violations of unitarity in neutrino mixing. Leaving out $sin^2 \theta_{eff}$, from the hadronic forward-backward asymmetry at LEP, we find a good fit to the data with some evidence of lepton universality violation at the $O(10^{−3})$ level. An improvement by a factor two in the measurement of the W-boson mass and of $sin^2 \theta_{eff}$ would be sufficient to claim a discovery.

Speaker: Lorenzo Basso (Institut Pluridisciplinaire Hubert Curien (FR))

Slides Basso_Planck2014.pdf

17:40 Simplified models for Lepton Flavour Violation at the LHC

We study charged Lepton Flavour Violation post the 8 TeV LHC run within supersymmetric scenarios. Focusing on the simplified models employed by the LHC collaborations for interpreting the searches for electro-weak production of sleptons and gauginos, we emphasize the complementarity of collider and low-energy data to unveil or constrain new physics effects. In particular, we show that large flavour violation in SUSY particles decays is still compatible with the low-energy constraints (e.g. from the MEG experiment) and can considerably affect the interpretation of the LHC searches in terms of simplified SUSY models, relaxing the bounds on slepton and gaugino masses.

Speaker: Lorenzo Calibbi (University of Brussels, ULB)

Slides calibbi_planck14.pdf

16:40 → 18:00 Higgs stability and SuSy

Convener: Thomas Gregoire (Carleton University)

16:40 Supersymmetric Custodial Triplets

"As it has been shown in the literature, triplet extended Higgs sectors suffer from fine tuning issues not present in the usual SM. These problems were solved in the Georgi-Macachek (GM) model by introducing a custodially invariant triplet extended Higgs sector. The quadratic divergences that arise in the corrections to the rho parameter in the GM model disappear when making it supersymmetric. Since the theory is expected to be custodially invariant at the SUSY breaking scale, we discuss how the breaking induced by the top Yukawa coupling and g' will affect the features of this model at the Electroweak scale."

Speaker: Mr Mateo García Pepin (IFAE / UAB)

Slides Garcia_Pepin.pdf

17:00 Dark Matter versus h into gamma gamma and h into gamma Z with supersymmetric triplets

The Triplet extension of the MSSM (TMSSM) alleviates the little hierarchy problem and provides a significant enhancement of the loop-induced diphoton rate of the lightest CP-even Higgs h. In this paper we pursue the analysis of the TMSSM Higgs phenomenology by computing for the first time the h into Z + gamma decay. Interestingly we find that the rates of loop-induced decays are correlated and their signal strengths can rise up to 40% - 60% depending on the channel. We furthermore study the dark matter phenomenology of the TMSSM. The lightest neutralino is a good dark matter candidate in two regions. The first one is related to the Higgs and Z resonances and the LSP is mostly Bino. The second one is achieved for a mass larger than 90 GeV and the LSP behaves as the well-tempered neutralino. An advantage of the triplet contribution is that the well-tempered neutralino can be a Bino-Triplino mixture, relieving the problem of achieving M_2 ~ M_1 in unified scenarios. The dark matter constraints strongly affect the Higgs phenomenology, reducing the potential enhancements of the diphoton and of the Z + photon channels by 20% at most. These enhancements are however larger than the MSSM ones. In the near future, complementarity of dark matter direct searches and collider experiments will be crucial to probe most of the parameter space where the neutralino is the dark matter candidate. (This work is based on arXiv:1403.6434)

Speaker: Victor Martin-Lozano (IFT-UAM/CSIC)

Slides 7.MLozano.pdf

17:20 Flavour Physics with Dirac gauginos and “how to fake a gluino”

LHC8 raised doubts on using naturalness as a guide in our quest for physics beyond the Standard Model. In MSSM fine tuning enters through the Higgs mass and in non-minimal extensions through the negative superpartner searches. One non-minimal theory with a less severe missing superpartner problem, is MSSM with Dirac gauginos. Dirac gauginos are also known to lead to much milder flavour violation bounds. We quantify bounds in well motivated flavour models and find out that this is true but only for a very restricted class of flavour patterns. Also, in investigating Dirac gaugino models, we identified a new way of suppressing quark - “gluino” couplings with novel phenomenological features.

Speaker: Panteleimon Tziveloglou (VUB)

Slides Dirac_Flavour_Tziveloglou.pdf

17:40 Triplet extended MSSM: naturality vs LHC data & perturbativity constraints

In this talk, I will briefly review the triplet extended MSSM, and then show that for a sizable portion of viable parameter space, associated with a large but still perturbative triplet coupling, the model features conspicuously smaller fine-tuning than in the case of MSSM-like couplings. I will then present the results of a fit to Higgs physics data as well as to low energy observables like the $B\rightarrow X_s\gamma$ decay, which demonstrate that the couplings allowed by direct search constraints generally lie well within the experimentally viable regions. Finally, I will show that the goodness of fit of the given experimental data by the triplet extended MSSM is comparable with that of the SM.

Speaker: Stefano Di Chiara (University of Helsinki)

Slides 9.dichiara.pdf

Wednesday, 28 May

09:00 → 10:30 Plenary

Convener: Graham Garland Ross (University of Oxford (GB))

09:00 Comprehensive analysis of Higgs couplings in Randall-Sundrum models

Speaker: Matthias Neubert

Slides Neubert.pdf

09:30 Cabibbo’s dream

Speaker: Belen Gavela Legazpi (Universidad Autonoma de Madrid (ES))

Slides Gavela-Planck-2014.pdf

10:00 Recent development in supersymmetric unification

TBA

Speaker: Borut Bajc (J. Stefan Institute, Ljubljana)

Slides bajc-planck14.pdf

10:30 → 11:00 Coffee Break

11:00 → 12:30 Plenary

Convener: Graham Garland Ross (University of Oxford (GB))

11:00 The Flavor of Higgs

Speaker: Yosef Nir (Weizmann Institute of Science (IL))

Slides nir_h_flavor.pdf

11:30 On the Rare Occasions When Naturalness Meets Flavor

Speaker: Gilad Perez (CERN & Weizmann)

Slides Gilad_Perez_Planck14.pdf

12:00 Flavor Physics and Lattice QCD

Speaker: Dr cecilia tarantino (University Roma Tre)

Slides planck_latflav_2014.pdf

14:30 → 16:10 Collider

Convener: Georg Ralf Weiglein (Deutsches Elektronen-Synchrotron (DE))

14:30 New Limits on Light Supersymmetric Hidden Sectors

We investigate the discovery prospects of Abelian hidden sectors in lower-energy fixed-target and high-precision experiments. We focus on a minimal supersymmetric realization consisting of an Abelian vector multiplet, coupled to hypercharge by kinetic mixing, and a pair of chiral Higgs multiplets. This simple theory can give rise to a broad range of experimental signals, including both commonly-studied patterns of hidden vector decay as well as new and distinctive hidden sector cascades. We find limits from the production of hidden states other than the vector itself. In particular, we show that if the hidden Abelian symmetry is higgsed, and the corresponding hidden Higgs boson has visible decays, it severely restricts the ability of the hidden sector to explain the anomalous muon magnetic moment. We end by commenting on how these low energy limits affect LHC search prospects.

Speaker: Andrew Spray (CoEPP, University of Melbourne)

Slides 1.Spray.pdf

14:50 Compressed Electroweakinos at the LHC

Chargino and neutralino (electroweakino) searches at the LHC in the multi-lepton plus missing energy topology lose sensitivity in the case of small mass splitting between the mass eigenstates. In this talk I will discuss (arXiv: 1312.7350) how the monojet searches, in combination with the presence of soft leptons, can be used to probe the parameter space. Electroweakino masses up to 200 GeV can be excluded with 300/fb at the 14 TeV LHC, and discovery is possible with 3000/fb in some regions of parameter space.

Speaker: José Francisco Zurita (University of Zurich)

Slides Zurita_Planck_2014.pdf

15:10 Light stop decays

In supersymmetric scenarios with small mass differences between the stop and the lightest supersymmetric particle, assumed to be the lightest neutralino, the light stop can decay via a flavour-changing decay $\tilde{t}_1\to c\tilde{\chi}_1^0$ or via a four-body decay $\tilde{t}_1\to b\tilde{\chi}_0f\bar{f}'$. For the decay $\tilde{t}_1\to c \tilde{\chi}_1^0$ to occur already at tree level, flavour violation is necessary. We present our computation of this decay at one-loop order allowing for flavour violation. The four-body decay is calculated with the full mass dependence of the third generation fermions including flavour-violating couplings. We will show that the four-body decay can compete with the decay $\tilde{t}_1\to c \tilde{\chi}_1^0$ implying that the experimental exclusion limits, which assume $BR(\tilde{t}_1\to c \tilde{\chi}_1^0)=100\%$, cannot be applied in general.

Speaker: Ramona Groeber (K)

Slides planck_lightstop.pdf

15:30 NATURAL SUSY AFTER THE LHC 8 TeV RUN

We investigate the impact of direct LHC SUSY searches on the parameter space of three natural scenarios in the MSSM. In the first case the spectrum consists of light stops, sbottoms, and Higgsino-like neutralinos, while the other particles are assumed to be out of the experimental reach. In the second case we consider an additional light gluino. Finally we study a more complex spectrum comprising also light sleptons, wino-like chargino, and a bino-like neutralino. We simulate in detail three orthogonal LHC SUSY searches and we calculate the exclusion likelihood due to the individual searches as well as their statistical combination. We calculate the fine-tuning measure of the points allowed by the LHC and the implications for the Higgs mass and other phenomenological observables: Higgs signal rates, the relic density, $B_s\to \mu^+\mu^-$, $b\to s \gamma$, and the spin-independent neutralino-proton scattering cross section.

Speaker: Dr Kamila Kowalska (NCBJ, Warsaw)

Slides 2014.05.28_Planck.pdf

15:50 A Bayesian analysis of the CMSSM and NUHM in light of the first run of the LHC and LUX.

We present a Bayesian analysis of the CMSSM and NUHM using the latest experimental data and numerical tools. We map the favoured regions of posterior probability in light of the latest data from the LHC and dark matter searches. We analyse the effect of corrections to the light higgs mass beyond the 2-loop order using $\tt FeynHiggs$. The experimental impact from the direct searches for squarks and gluinos at ATLAS from the LHC run 1 data is included in the Likelihood. The measurements of the signal strength and mass of the light higgs boson by ATLAS and CMS are included using $\tt HiggsSignals$. The latest constraints on the spin independent scattering cross section of the neutralino from LUX are applied taking into account uncertainties in the nuclear form factors. We also derive the excepted sensitivity of the future CTA experiment to 1TeV higgsino dark matter for both the constrained models and the more general pMSSM. We comment on the complementarity of this search to planned direct detection experiments such as XENON 1T. We compare the prospects of future detection in both models.

Speaker: Andrew Williams

Slides awilliams_planck_2014.pdf

14:30 → 16:10 Dark Matter

Convener: Michel Tytgat (Université Libre de Bruxelles)

14:30 New results on Sommerfeld enhancements and relic abundance of neutralino dark matter in the general MSSM

We discuss the impact of Sommerfeld enhancements on the neutralino LSP relic abundance calculation for heavy neutralino dark matter including co-annihilations of nearly mass-degenerate neutralino and chargino states. Interesting regions in the MSSM parameter space are identified, focusing on heavy wino- and higgsino-like dark matter scenarios and models interpolating between the two cases. We investigate several benchmark scenarios in this part of the parameter space. Sommerfeld enhancements in all (co-)annihilation processes of (nearly) mass-degenerate neutralino and chargino states are considered, including P- and next-to-next-to-leading order S-wave annihilations. A newly developed method enables us in addition to treat effects from heavy states perturbatively in the Sommerfeld enhanced rates. Our generic analytic calculation of all (off)-diagonal potential and annihilation matrices allows for the first time a rigorous study of Sommerfeld enhancements in neutralino and chargino pair-annihilations in the general MSSM.

Speaker: Charlotte Hellmann (TU Munich)

Slides PLANCKtalk_CHellmann.pdf

14:50 Self-interacting Dark Matter with local Z3 symmetry

We construct a self-interacting scalar dark matter (DM) model with local discrete Z3 symmetry that stabilizes a weak scale scalar dark matter X. The model assumes a hidden sector with a local U(1)X dark gauge symmetry, which is broken spontaneously into Z3 subgroup by nonzero VEV of dark Higgs field ϕX (⟨ϕX⟩≠0). Compared with global Z3 DM models, the local Z3 model has two new extra fields: a dark gauge field Z′ and a dark Higgs field ϕ (a remnant of the U(1)X breaking). After imposing various constraints including the upper bounds on the spin-independent direct detection cross section and thermal relic density, we find that the scalar DM with mass less than 125 GeV is allowed in the local Z3 model, in contrary to the global Z3 model. This is due to new channels in the DM pair annihilations open into Z′ and ϕ in the local Z3 model. Most parts of the newly open DM mass region can be probed by XENON1T and other similar future experiments. Also if ϕ is light enough (a few MeV ≲mϕ≲ O(100) MeV), it can generate a right size of DM self-interaction and explain the astrophysical small scale structure anomalies. This would lead to exotic decays of Higgs boson into pair of dark Higgs, which could be tested at LHC and ILC.

Speaker: Dr Yong Tang (KIAS, Seoul)

Slides Planck_Tang.pdf

15:10 Phenomenology of Neutralino-Stop Coannihilation considering SUSY-QCD Corrections

After the discovery of a 125 GeV Higgs boson, light stop scenarios are strongly motivated. With currently having only weak constraints from the LHC for almost degenerate neutralino and stop masses, supersymmetry could still hide in this corner. In this region of the MSSM parameter space, neutralino-stop coannihilation can also play an important role in order to meet the experimentally determined value for the dark matter relic density. For this reason, we have calculated the full next-to-leading order SUSY-QCD corrections to neutralino-stop coannihilation and have studied their effect on the relic density. We will show that the impact of these corrections is larger than current experimental uncertainties and that they are important for a first uncertainty estimation. Taking into account these corrections, more precise exclusion limits on the MSSM parameter space can be set.

Speaker: Dr Julia Harz (University College London)

Slides Planck2014.pdf

15:30 Model Independent Bounds in Direct Dark Matter Searches

Direct searches for Dark Matter (DM) aim at detecting the nuclear recoils arising from a scattering between DM particles and target nuclei in underground detectors. Since the physics that describes the collision between DM particles and target nuclei is deeply non-relativistic, in this presentation I’ll review a different and more general approach to study signal in direct DM searches based on the formalism of non-relativistic operators. Then I’ll present the main observables pointing out all the uncertainties that enter in this field. Finally, since the underlying relativistic theory that describes both the DM and the standard model fields is unknown, in the last part of this presentation I’ll present a new method and a self-contained set of numerical tools to the derive the bounds from some current direct detection experiments on virtually any arbitrary model of DM elastically scattering on target nuclei.

Speaker: Paolo Panci (Institute d'Astrophysique de Paris (IAP))

Slides https://www.dropbox.com/sh/6nuj8jhi9fetas9/AACxIc4wp3SKc2lb0DwiPWRYa Planck_2014.pdf

15:50 Anti-nuclei from Dark Matter

Light anti-nuclei, namely anti-deuteron and anti-helium, can be produced through the nuclear coalescence of the anti-protons and the anti-neutrons that are originated in a dark matter pair annihilation event. At low kinetic energies, the fluxes of these bound states are found to dominate over the astrophysical background and thus anti-nuclei may be considered as a very promising channel for a dark matter indirect detection, especially for WIMPs with a low or intermediate mass. In this talk, an overview on the principal issues related both to the anti-nuclei production and to their subsequent propagation through the interstellar medium and the heliosphere will be given. Then, the capability of current and future experiments to detect a light anti-nuclei flux produced by dark matter annihilation will be investigated in relation to the constraints on the dark matter annihilation cross section that can be derived from the latest measurements of the cosmic anti-proton flux.

Speaker: Andrea Vittino (Universita' di Torino and IPhT/CEA Saclay)

Slides Vittino_Planck.pdf

14:30 → 16:10 Higgs

Convener: Dr Pietro Slavich (Centre National de la Recherche Scientifique (FR))

14:30 Probing Higgs Couplings with High pT Higgs Production

Possible extensions of the Standard Model predict modifications of the Higgs couplings to gluons and to the SM top quark. The values of these two couplings can, in general, be independent. We discuss a way to measure these interactions by studying the Higgs production at high $p_T$ within an effective field theory formalism. We also propose an observable $r_\pm$ with reduced theoretical errors and suggest its experimental interpretation.

Speaker: Ayan Paul (I)

Slides Planck_Paris_2014.pdf

14:50 Charming the Higgs

Current Higgs data permit a significantly enhanced Higgs coupling to charm pairs, comparable to the Higgs to bottom pairs coupling in the Standard Model, without resorting to additional new physics sources in Higgs production. An immediate consequence of such a large charm coupling is a significant reduction of the Higgs signal strengths into the known final states as in particular into bottom pairs. This might reduce the visible vector-boson associated Higgs production rate to a level that could compromise the prospects of ever observing it. We however demonstrate that a significant fraction of this reduced signal can be recovered by jet-flavor-tagging targeted towards charm-flavored jets.

Speaker: Cedric Delaunay (Unite Reseaux du CNRS (FR))

Slides charminghiggs_planck14.pdf

15:10 Very boosted Higgs in gluon fusion

The Higgs production and decay rates offer a new way to probe new physics beyond the Standard Model. While dynamics aiming at alleviating the hierarchy problem generically predict deviations in the Higgs rates, the current experimental analyses cannot resolve the long- and short-distance contributions to the gluon fusion process and thus cannot access directly the coupling between the Higgs and the top quark. We investigate the production of a boosted Higgs in association with a high-transverse momentum jet as an alternative to the $t\bar{t}h$ channel to pin down this crucial coupling. Presented first in the context of an effective field theory, our analysis is then applied to models of partial compositeness at the TeV scale and of natural supersymmetry.

Speaker: Matthias Josef Schlaffer (Deutsches Elektronen-Synchrotron (DE))

Slides Planck14_Schlaffer.pdf

15:30 Measuring the Trilinear Higgs Coupling at the LHC

The results from the LHC indicate that the couplings of the Higgs boson to other particles are consistent with the Standard Model. However the final and ultimate test as to whether this particle is the standard Higgs boson will be the coupling of the Higgs boson to itself. We study the Higgs pair production from gluon fusion at the LHC and try to determine how accurately the trilinear Higgs coupling can be determined theoretically.

Speaker: Prof. Chung Kao (University of Oklahoma)

Slides Kao_Planck2014.pdf

15:50 Higgs mass and anomalous Higgs interactions in gauge-Higgs unification

We discuss the phenomenological implications of gauge-Higgs unification scenario on the Higgs physics. In the scenario, Higgs is a gauge field in higher dimensional space-time to start with. Thus, the Higgs potential is basically handled by the gauge principle and Higgs mass is related to the weak scale, as in MSSM. As a concrete example, we take 6-dimensional gauge-Higgs unification model, where $M_{H}= 2M_{W}$ at the tree level. It is pointed out that the quantum correction to this relation is calculable without suffering from UV-divergence, just as in MSSM. Also discussed is "anomalous Higgs interactions" in this scenario and related scenario of dimensional deconstruction. In the scenario of gauge-Higgs unification, Higgs may be regarded as a sort of Aharonov-Bohm phase. Thus all observables are expected to be periodic functions of the Higgs field. We argue that this periodicity, together with the breaking of translational invariance along the extra space, leads to Yukawa coupling for lighter quarks, which behaves as a trigonometric function of the Higgs VEV. We thus conclude that in this scenario, Higgs interactions such as Yukawa coupling deviate in general from the predictions of the standard model: ``anomalous Higgs interactions". This talk is based on my recent works published in Phys. Rev. D87(2013)016011 and arXiv:1402.6761[hep-ph].

Speaker: Prof. C.S. Lim (Tokyo Woman's Christian University)

Slides C.S.Lim_(Planck14).pdf

14:30 → 16:10 Leptogenesis

Convener: Sacha Davidson (Universite Claude Bernard-Lyon I (FR))

14:30 Strong thermal Leptogenesis in the SO(10)-inspired model: a complete picture of the low energy neutrino parameters.

Leptogenesis is an elegant scenario that explains the neutrino mass origin and the baryon asymmetry of the Universe as natural consequences of the famous seesaw mechanism. After introducing the attractive framework provided by the SO(10)-inspired model of Leptogenesis, I show a full set of testable predictions that pin down the same parameters that neutrino experiments are currently trying to measure. Such complete picture of the oscillation parameters is derived from the strong thermal solutions of the SO(10)-inspired model, which ensure the independence of our results from the state of the Universe prior to the onset of Leptogenesis.

Speaker: Luca Marzola (U)

Slides Luca_Marzola_Planck2014_pdf.pdf

14:50 Flavour Covariant Transport Equations for Resonant Leptogenesis

Flavour effects play an important role in the statistical evolution of particle number densities in several particle and astroparticle physics phenomena. A *fully* flavour-covariant formulation of transport phenomena is presented, with a Resonant Leptogenesis (RL) scenario in mind, in order to capture all flavour effects, both in the heavy-neutrino and charged-lepton sectors. For concreteness, we consider the Standard Model accompanied by quasi-degenerate heavy Majorana neutrinos, even though the formalism can be easily applied to study flavour effects in other physical situations. Flavour covariance requires one to consider generically off-diagonal number densities, as well as rank-4 rate tensors in flavour space. Particular emphasis is put on the non-trivial generalization of the discrete symmetries $C$, $P$ and $T$ in the flavour-covariant formalism. The flavour covariant transport equations provide an unified description of RL, capturing three relevant phenomena: coherent heavy-neutrino oscillations, quantum decoherence in the charged-lepton sector, and the standard, zero-temperature, resonant CP violation due to heavy-neutrino mixing. We we show quantitatively that the final asymmetry predicted by the flavour-covariant rate equations is enhanced of even an order of magnitude, as compared to that obtained from flavour-diagonal equations.

Speaker: Daniele Teresi (U)

Slides flavour_covariant_RL.pdf

15:10 Leptogenesis in runaway and crossing regimes

We study runaway and crossing regimes of resonant leptogenesis, which have not been addressed before, using non-equilibrium quantum field theory. In the runaway regime the mass difference monotonously grows with temperature, whereas in the crossing regime the mass difference initially decreases, such that the effective masses become equal at some temperature. We analytically demonstrate that vanishing of the difference of the effective masses by no means implies vanishing or suppression of CP-violation. In the vicinity of the crossing point the asymmetry calculated in the Boltzmann approximation develops a spurious peak, which signals the breakdown of the quasiparticle approximation. In the exact result the spurious enhancement is exactly compensated by coherent transitions between the two mass shells. Despite the breakdown of the quasiparticle approximation the purely off-shell contributions remain small even at the crossing point. The results of this work provide a reference point for various approximations schemes including the density matrix equations.

Speaker: Dr Alexander Kartavtsev (Max-Planck-Institute for Physics)

Slides Kartavtsev.pptx

15:30 Flavoured scalar triplet leptogenesis

I present a generic approach of leptogenesis through the decay of a scalar triplet that also contributes to nonzero neutrino masses through the type II seesaw. It is known that a single scalar triplet is insufficient to generate the baryon asymmetry of the universe, so that other particles are needed. Assuming that these supplementary particles are heavy enough, their effect can be encoded in an effective dimension-5 operator that gives another contribution to neutrino masses. I show that, contrary to the minimal leptogenesis scenario involving right-handed neutrinos, flavor effects can be relevant even in the high-temperature regime where lepton flavours are undistinguishable. In this regime, the correct treatment should involve a $3\times3$ density matrix describing the asymmetries stored in the different flavours as well as the quantum correlations. I derive the evolution equation for this density matrix and solve numerically the set of Boltzmann equations for different values of the parameters and computed the predicted baryon asymmetry of the universe.

Speaker: Benoit Schmauch (I)

Slides Flavoured Scalar Triplet Leptogenesis

15:50 Eigenvector parametrisation, reactor mixing angle and hybrid seesaw

It is useful to write the neutrino mass matrix in terms of the eigenvectors of the lepton mixing matrix. In terms of this decomposition, the neutrino mass matrix can be seen as originating from a tribimaximal dominant structure with small departures required by the reactor mixing angle. Such a structure arises very naturally in cases with more than one mechanism responsible for neutrino masses - "hybrid seesaw".

Speaker: Ivo de Medeiros Varzielas (University of Basel)

Slides Planck2014.pdf

16:10 → 16:40 Coffee Break

16:40 → 18:00 Collider

Convener: Mark Dayvon Goodsell (Ecole Polytechnique (FR))

16:40 Collider limits on light neutralino dark matter

We investigate the current status of the light neutralino dark matter scenario within the minimal supersymmetric standard model (MSSM) taking into account latest results from the LHC. A discussion of the relevant constraints, in particular from the dark matter relic abundance, leads us to manageable simplified models defined by a subset of MSSM parameters. Within these simplified model we reinterpret recent searches for electroweak supersymmetric particle production at the LHC. In this way we derive stringent constraints on the light neutralino parameter space. In combination with further experimental information from the LHC, such as constraints on invisible Higgs decays, we obtain a lower bound on the lightest neutralino mass of about 24 GeV when the lightest neutralino is accompanied by a light stau to fulfil the relic density constraint. Without additional light scalars more stringent constraints can be obtained. These limits are stronger than any current limit set by underground direct dark matter searches or indirect detection experiments.

Speaker: Jonas Lindert

Slides JL_planck14.pdf

17:00 Long-Lived stop at the LHC with or without R-parity

We consider scenarios of gravitino LSP and DM with stop NLSP both within R-parity conserving and R-parity violating supersymmetry (RPC and RPV SUSY, respectively). We discuss cosmological bounds from Big Bang Nucleosynthesis (BBN) and the gravitino abundance and then concentrate on the signals of long-lived stops at the LHC as displaced vertices or metastable particles. Finally we discuss how to distinguish R-parity conserving and R-parity breaking stop decays if they happen within the detector and suppress SM backgrounds.

Speaker: Federico Dradi (G)

Slides Planck14-Dradi.pdf

17:20 The Elusive Gluon

We study the phenomenology of new color octet vector resonances, heavy gluons, in models of strong electroweak symmetry breaking. Motivated by the Higgs discovery, realistic models of strong electroweak symmetry breaking are likely to contain relatively light new vector-like quarks, the top partners. We point out the importance of heavy gluon decays to top partner pairs that were overlooked in previous experimental searches at the LHC. These searches focused on simplified benchmark models in which the only new particle beyond the Standard Model was the heavy gluon. It turns out that, when kinematically allowed, such heavy-heavy decays make the heavy gluon elusive, and the bounds on its mass can be up to 1 TeV milder than in the simpler models considered so far. We discuss the origin of this difference and prospects for dedicated searches.

Speaker: Dr Jose Juknevich (SISSA)

Slides juknevich_planck2014.pdf

17:40 Limits on top quark compositeness

If the top quark is a composite state made out of some constituents, its interaction with the gluon will be modified. We introduce the leading effective operators that contribute to the radius and anomalous magnetic moment of the top quark and derive bounds by studying their effect on the cross section for $t \bar t$ production at the Tevatron and the LHC. In addition, we also include constraints from data on spin correlations of the top quarks at the LHC. A combined analysis of these measurements set a stringent limit on the scale of compositeness. This limit is comparable to similar limits obtained for light quarks and those from electroweak precision measurements.

Speaker: Dr alberto tonero (ICTP-SAIFR)

Slides tonero.pdf

16:40 → 18:00 Dark Matter

Convener: Michel Tytgat (Université Libre de Bruxelles)

16:40 Resonant production of dark matter at LHC and Direct Detection complementarity

In this talk I plan to discuss how different searches at the LHC concerning dark matter can complement, and in some cases substantially reduce, the still available parameter space of WIMP's direct detection, with special focus on BSM models with extra gauged U(1).

Speaker: Bryan Zaldívar (ULB, Brussels)

Slides 5.zaldivar.pdf

17:00 Systematic uncertainties in dark matter searches due to halo asphericity

We study the impact of aspherical dark matter density distribution in Milky-Way like halo on direct and indirect searches. Using data from large N-body cosmological simulation Bolshoi, we perform a complete statistical analysis and quantify the systematic uncertainties that affect the determination of local dark matter density and J factors for annihilating and decaying dark matter. We find that the systematic effects can be as large as 50% at 95% CL for a spherically averaged local density of 0.3 GeV/cm^3. Similarly, systematic uncertainties for J factors evaluated around the galactic center can be as large as 20% and 15% at 95% CL for decaying and annihilating dark matter, for typical NFW profiles.

Speaker: Nicolás Bernal

Slides triaxial.pdf

17:20 Dark matter in two Higgs doublet models with local U(1)_H gauge symmetry

In the 2HDMs, an ad hoc Z_2 symmetry is typically imposed in order to avoid the flavor problems. We propose to introduce local U(1) Higgs flavor symmetry, that distinguishes one Higgs doublet from the other. Then the U(1) gauge symmetry could be the origin of the Z_2 symmetry. We study phenomenology of this model by taking into account various theoretical and experimental constraints. We also discuss the models with a candidate for the dark matter, the stability condition, and dark matter physics.

Speaker: Chaehyun Yu (KIAS)

Slides 2HDMwU(1),chyu.pdf

17:40 Low fine tuning in the MSSM with higgsino dark matter and unification constraints

We examine the issue of fine tuning in the MSSM with GUT-scale boundary conditions. We focus on a phenomenologically interesting region that is favored by the Higgs mass measurement and the relic density, where the dark matter is a nearly pure higgsino with mass ~1 TeV, while the scalars and gauginos have masses in the multi-TeV regime. We identify specific unification patterns that can lead to a significant reduction of the fine tuning due to the gaugino, scalar, and higgsino masses, relative to the simplest unification conditions. More properly, the fine tuning is shifted from the masses to the parameters of the underlying theory, whose relation can emerge quite strikingly from phenomenological requirements (relic density, Higgs+LHC, LUX). We give an example of this mechanism in the context of supergravity and SU(5) unification.

Speaker: Enrico Maria Sessolo (NCBJ, Warsaw)

Slides SessoloPLANCK14.pdf

16:40 → 18:00 Higgs: stability and EWSB

Convener: Dr Pietro Slavich (Centre National de la Recherche Scientifique (FR))

16:40 On the gauge dependence of the Standard Model vacuum instability scale

After reviewing the calculation of the Standard Model one-loop effective potential in a class of linear gauges, we discuss the physical observables entering the vacuum stability analysis. In particular, the field value at which the effective potential turns negative (the so-called instability scale, often associated with the physical threshold of the "new physics") is a gauge dependent quantity. Such a gauge ambiguity is explicitly shown in the case of the Standard Model.

Speaker: Dr Luca Di Luzio (KIT)

Slides Di_Luzio.pdf

17:20 Electroweak Symmetry Breaking by a Strongly Coupled Sector

The LHC and other experiments show so far no sign of new physics and long-held believes about naturalness should be critically reexamined. I will discuss models with a combined breaking of conformal and electroweak symmetry by a strongly coupled sector, which serves as a new paradigm in solving the hierarchy problem. For the first model, a strongly coupled hidden sector undergoes spontaneous chiral symmetry breaking and a coupling via a real scalar field transmits the breaking scale to the Standard Model Higgs and triggers electroweak symmetry breaking. The model contains dark matter candidates in the form of dark pions, whose stability is being guaranteed by the flavor symmetry of hidden quark sector. In the second model we will discuss how electroweak symmetry breaking can be achieved within the framework of minimal extension of QCD, paving a new way for model building.

Speaker: Kher Sham Lim (Max-Planck-Institut fuer Kernphysik)

Slides lim_paris2.pdf

17:40 Scale invariance and electroweak symmetry breaking

We discuss the relevance of classical scale invariance for a technically natural solution to the problem of the radiative stability of the electroweak scale. Some realistic electroweak scale-invariant models are considered and their possible manifestations at the LHC are briefly discussed.

Speaker: Archil Kobakhidze (The University of Sydney)

Slides PLANCK2014-Kobakhidze.pdf

16:40 → 18:00 Leptogenesis: and Baryogenesis

Convener: Sacha Davidson (Universite Claude Bernard-Lyon I (FR))

16:40 Type-I leptogenesis in models with extended scalar sectors

In standard type-I leptogenesis, the right-handed neutrino scattering processes are in general subleading. In contrast, in scenarios where the right-handed neutrinos couple to an extended scalar sector, their scattering processes with the new degrees of freedom can play a crucial role in the resulting B-L asymmetry. We study these scattering processes in a fairly model-independent way and show that, depending on the size of the couplings to the extended scalar sector, they can render leptogenesis inoperative or lead to large enhancements of the B-L yield. This effect will be present in a general class of models where the mass of the right-handed neutrinos is dynamically generated. As an example, we will illustrate it in a specific model with spontaneous lepton number violation.

Speaker: Avelino Vicente Montesinos (Université de Liège)

Slides 6.vicente.pdf

17:00 Leptogenesis in the Classically Scale Invariant Standard Model with the Higgs Portal

The Standard Model with an added Higgs portal interaction and no explicit mass terms is a classically scale invariant theory without the Standard Model naturalness problem. We show that we can generate the observed baryon asymmetry of the Universe in such models through Leptogenesis via the oscillation of right-handed neutrinos when the Standard Model is extended by a $U(1)_{B-L}$ gauge group. As required by classical scale invariance no new large mass scales are introduced and the right-handed neutrinos have GeV scale masses.

Speaker: Gunnar Ro (Durham University)

Slides planck2014_Ro.pdf

17:20 Particle-antiparticle asymmetries from annihilations

Common mechanisms invoked to explain particle antiparticle asymmetries involve the out-of-equilibrium and CP violating decay of a heavy particle. In this talk I discuss how asymmetries can arise purely from $2 \leftrightarrow 2$ annihilations instead of the usual $1 \leftrightarrow 2$ decays and inverse decays. I will present a simple toy model to point out the salient features of such a scenario and to illustrate how an asymmetry can arise while respecting CPT and S-matrix unitarity. I will also discuss a baryogenesis scenario in which annihilations and decays compete in creating the baryon asymmetry. Annihilations may actually dominate over decays in determining the final asymmetry in certain areas of parameter space. Such ideas could also have applications in asymmetric dark matter models.

Speaker: Mr Iason Baldes (University of Melbourne)

Slides baldes_planck_140524.pdf

17:40 Out-of-equilibrium Baryogenesis with Gravitino Dark Matter

We present a mechanism able to relate the Dark Matter and Baryon densities in the context of out-of-equilibrium baryogenesis with DM production *"à la"* SuperWIMP, starting from the same initial particle. Although rather general this mechanism is particularly well realized in the case of Gravitino Dark Matter. We will then discuss concrete realizations of this scenario in Supersymmetric extensions of the Standard Model.

Speaker: Giorgio Arcadi

Slides Planck_arcadi.pdf

Thursday, 29 May

09:00 → 10:30 Plenary

Convener: Carlos Savoy (CNRS)

09:00 Ultra-weak sectors

TBA

Speaker: Graham Garland Ross (Department of Theoretical Physics-University of Oxford)

Slides Planck_2014.pdf

09:30 Naturally light uncolored and heavy colored super-particles

TBA

Speaker: Gautam Bhattacharyya (Variable Energy Cyclotron Centre (VECC))

Slides gautam_planck2014.pdf

10:00 Symmetry breaking and light scalars in realistic supergravities

Speaker: Fabio Zwirner (Universita e INFN (IT))

Slides fz_planck2014_shown.pdf

10:30 → 10:57 Coffee Break

10:57 → 11:00 Presentation of Planck 2015

Speaker: Georgios Leontaris (University of Ioannina (GR))

Slides presentation_Planck_2015.pdf

11:00 → 12:30 Plenary

Convener: Carlos Savoy (CNRS)

11:00 Minimal Models for Inflation from Minimal Supergravity

TBA

Speaker: Sergio Ferrara (Universita e INFN, Roma I (IT))

Slides 4.Ferrara.pdf

11:30 Naturalness without prejudice Beyond the Standard Theory

Speaker: Ignatios Antoniadis (CERN)

Slides Antoniadis_Planck2014.pdf

12:00 The Higgs and Naturalness

TBA

Speaker: Tony Gherghetta (University of Melbourne (AU))

Slides Gherghetta.pdf

14:30 → 16:10 Cosmology: Inflation

Convener: Eung Jin Chun (Korea Institute for Advanced Study)

14:30 Self-complete chaotic inflation

We propose a general chaotic inflation model with non-canonical kinetic term. The form of the potential is fixed due to the requirement that the inflation model is a quadratic form in the large field values of the inflaton. We show that a large coupling in the non-canonical kinetic term allows for the slow-roll inflation with sub-Planckian field values of the inflaton and the successful predictions of the quadratic inflation in light of BICEP2 results are maintained in our model. We find that the inflaton kinetic term is determined by the inflaton vacuum expectation value with the large coupling, so the canonically-normalized inflaton has Planck-suppressed interactions only.

Speaker: Prof. Hyun Min Lee (Chung-Ang University)

Slides Planck2014-hmlee.pdf

14:50 A classically scale invariant model of inflation

We consider a classically scale invariant model of scalar field inflation. The treel level potential contains only quartic terms and the scale of inflation is generated dynamically. Both hilltop and chaotic inflation are possible. The model can explain the BICEP2 signal of tensor modes. Reheating takes place via decay into right handed neutrinos.

Speaker: Kristjan Kannike (Nat. Inst. of Chem.Phys. & Biophys. (EE))

Slides Kannike_Planck_2014.pdf

15:10 On the realization of the supersymmetric Starobinsky inflation with higher order corrections

Starobinsky's R^2 inflation is still one of the most atractive inflation models. However, once we consider its supersymmetric version, we have no reason not to consider its higher order corrections, which would destroy the slow-roll evolution of the Universe and successful inflation and make the initial condition tuning severe. Here I show the constraint on the higher order correction to the supersymmetric Starobinsky model and the way to relax its initial condition problem.

Speaker: Dr Kohei Kamada (Ecole Polytechnique Federale de Lausanne)

Slides KK_0529Planck.pdf

15:30 Supersymmetric Moduli Stabilization and Inflation

We analyze the corrections to various F-term inflation models induced by a supersymmetrically stabilized Kähler modulus. We present general expressions for both small-field and large-field (chaotic) inflation models. Furthermore, we investigate the implications and constraints of supersymmetry breaking after inflation.

Speaker: Mr Clemens Wieck (DESY Hamburg)

Slides Planck2014-CWieck.pdf

15:50 The inflaton as a dark matter candidate

We propose a novel mechanism for the incomplete decay of the inflaton field that, while reheating the universe after inflation, leaves a stable oscillating scalar condensate that can account for the observed dark matter abundance. We discuss possible embeddings of this mechanism within different inflationary models, in particular chaotic and hybrid inflation, as well as within extensions of the Standard Model of particle physics.

Speaker: Mar Bastero Gil (U)

Slides inflatonDM_Planck14_mbg.pdf

14:30 → 16:10 Flavor: and SuSy

Convener: Dr cecilia tarantino (University Roma Tre)

14:30 Lepton Flavor Violation in Flavored Gauge Mediation

I will discuss lepton flavor violation in modifications of Gauge Mediation with new direct couplings between messenger and matter fields that are controlled by an underlying flavor symmetry. Even In the context of simple U(1) flavor models these models lead to LFV effects that are as strongly suppressed as in SUSY Partial Compositiness. Moreover there is an additional suppression of flavor-blind phases that allow to reconcile very light sleptons even with the strong bounds from the electron EDM.

Speaker: Dr Robert Ziegler (LPTHE and ILP)

Slides Ziegler.pdf

14:50 Towards predictive flavour SUSY SU(5) models with doublet triplet splitting

We discuss how the double missing partner mechanism solution to the doublet-triplet splitting problem in four-dimensional supersymmetric SU(5) GUTs can be combined with GUT flavour models which predict the quark and lepton mass ratios. It is argued that towards this goal a second GUT breaking Higgs field in the adjoint representation is required. We discuss all possible renormalisable superpotentials of two adjoint Higgs fields in general and calculate the constraints on the GUT scale and effective triplet mass from a two-loop gauge coupling unification analysis. Two explicit models for the Yukawa sector are presented, including shaping symmetries and a renormalisable messenger sector. Towards calculating the proton decay via $d=5$ operators the Clebsch-Gordan coefficients for a selection of possible Yukawa coupling operators to the coloured Higgs triplets are presented. General implications for the proton decay in both example models are discussed.

Speaker: Constantin Sluka (University of Basel)

Slides Planck_Sluka_talk.pdf

15:10 Resurrecting the minimal renormalizable supersymmetric SU(5) model

We are investigating whether contrary to the popular belief there still exists some portion of parameter space where the minimal renormalizable supersymmetric SU(5) GUT model could be reconciled with all the phenomenological constraints while remaining perturbative all the way. The largest obstacle poses the accommodation of the measured mass of the b quark in connection with the vacuum (meta)stability constraints. Mass of the colour Higgs triplet that enables the unification of gauge couplings and which on one side would not be too small to lead to too rapid proton decay while on the other hand would remain well below the Planck mass, is another powerful constraint. Preliminary results show that to correct the down-sector quark masses unusually large supersymmetry breaking trilinear A-terms are required which in turn then importantly influence also the running of the soft masses and the computation of the light Higgs mass.

Speaker: Timon Mede (IPhT, CEA-Saclay, France)

Slides Mede.pdf

15:30 A little more gauge mediation and the light higgs mass

Minimal Gauge Mediation has been under severe stress since the discovery of the Higgs Boson at 125 GeV. In the present talk, we propose solution which do not introduce messenger- matter mixing. We show that an extra U(1) factor in addition to the Standard Model gauge group can significantly alter the situation. A U(1) charged, Standard Model singlet is assumed to be present which allows for an additional NMSSM like coupling, \lambda H_u H_d S. The U(1) is assumed to be flavour universal. Anomaly cancellation in the MSSM sector requires additional coloured degrees of freedom. The S field can get a large vacuum expectation value along with consistent electroweak symmetry breaking. It is shown that the lightest CP even Higgs boson can attain mass of the order of 125 GeV.

Speaker: Sudhir Kumar Vempati (Centre for High Energy Physics, Indian Institute of Science)

Slides Planck-2014.pdf

15:50 Precise focusing in the focus point scenario toward the natural Higgs boson in the MSSM

A small Higgs mass parameter m_{h_u}^2 can be insensitive to various trial heavy stop masses, if a universal soft squared mass is assumed for the chiral superpartners and the Higgs boson at the grand unification (GUT) scale, and a focus point (FP) of m_{h_u}^2 appears around the stop mass scale. The challenges in the FP scenario are (1) a too heavy stop mass (~ 5 TeV) needed for the 126 GeV Higgs mass and (2) the too high gluino mass bound (> 1.4 TeV). For a successful FP scenario, we consider (1) a superheavy right handed (RH) neutrino and (2) the first and second generations of hierarchically heavier chiral superpartners. The RH neutrino can move a FP in the higher energy direction in the space of (Q, m_{h_u}^2(Q)), where Q denotes the renormalization scale. On the other hand, the hierarchically heavier chiral superpartners can lift up a FP in that space through two-loop gauge interactions. Precise focusing of m_{h_u}^2(Q) is achieved with the RH neutrino mass of ~ 10^{14} GeV together with an order one (0.8-1.4) Yukawa coupling to the Higgs, and the hierarchically heavy masses of 15-25 TeV for the heavier generations of superpartners, when the U(1)_R breaking soft parameters, m_1/2 and A_0 are set to be 1 TeV at the GUT scale. Those values can naturally explain the small neutrino mass through the seesaw mechanism, and suppress the flavor violating processes in supersymmetric models.

Speaker: Prof. Bumseok Kyae (Pusan National University (Korea))

Slides 5.KYAE.pdf

14:30 → 16:10 Formal

Convener: Angel Uranga (I)

14:30 Supersymmetric Warped AdS in Extended Topologically Massive Supergravity

We determine the most general form of off-shell N=(1,1) supergravity field configurations in three dimensions by requiring that at least one off-shell Killing spinor exists. We then impose the field equations of the topologically massive off-shell supergravity and find a class of solutions whose properties crucially depend on the norm of the auxiliary vector field. These are spacelike-squashed and timelike-stretched AdS_3 for the spacelike and timelike norms, respectively. At the transition point where the norm vanishes, the solution is null warped AdS_3. This occurs when the coefficient of the Lorentz-Chern-Simons term is related to the AdS radius by μℓ=2. We find that the spacelike-squashed AdS_3 can be modded out by a suitable discrete subgroup of the isometry group, yielding an extremal black hole solution which avoid closed timelike curves.

Speaker: Prof. Nihat Deger (Bogazici University)

Slides Supersymmetric_Warped_AdS_.pdf

14:50 Heterotic Supergravity, Holomorphic Bundles, and Moduli

I will consider heterotic supergravity compactified to four dimensions at first order in alpha', commonly known as the Strominger System. I will show how the system can be put in terms of a generalised bundle over the base manifold. This bundle is holomorphic if and only if the Bianchi Identities for the curvatures and the NS-field-strength H are satisfied. I will consider infinitesimal deformations of this bundle, which correspond to infinitesimal moduli of the Strominger System. I will also discuss an ambiguity of a connection choice on the tangent bundle TX, relating to a freedom to redefine the fields. I will show how this ambiguity must be included as part of the moduli space of the system, in order for the mathematical structure to work out.

Speaker: Mr Eirik Eik Svanes (University of Oxford)

Slides Strominger.pdf

15:10 Heterotic Line Bundle Models on Smooth Calabi-Yau Manifolds

Based on: arXiv:1307.4787, arXiv:1311.1941 and arXiv:1202.1757. It has recently been realised that polystable, holomorphic sums of line bundles over smooth Calabi-Yau three-folds provide a fertile ground for heterotic model building. Large numbers of phenomenologically promising such models have been constructed for various classes of Calabi-Yau manifolds. We discuss the class of models based on complete intersections in products of projective spaces. We also present a case study for the tetra-quadric manifold - a Calabi-Yau hypersurface embedded in a product of four $\mathbb C\mathbb P^1$ spaces. For a specific semi-realistic example, we explore the embedding of the line bundle sum into the larger moduli space of non-Abelian bundles, both by means of constructing specific polystable non-Abelian bundles and by turning on VEVs in the associated low-energy theory. In this context, we explore the fate of the Higgs doublets as we move in bundle moduli space. The non-Abelian compactifications thus constructed lead to $SU(5)$ GUT models with an extra global $U(1)$ symmetry, which combined with the hypercharge leads to a $B-L$ symmetry. The non-Abelian compactifications inherit many of the appealing phenomenological features of the Abelian model, such as the absence of dimension four and dimension five operators triggering a fast proton decay.

Speaker: Andrei Constantin (University of Oxford)

Slides HeteroticModels.pdf

15:30 Dark Radiation predictions from general Large Volume Scenarios

The existence of Dark Radiation is a generic prediction of the Large Volume Scenario (LVS), a popular scheme of moduli stabilisation in type IIB string theory. Consequently, measurements of the amount of Dark Radiation put stringent constraints on models based on the LVS. In this talk I will quantify predictions for Dark Radiation for a wide range of LVS models. In particular, I will show that some of the most natural LVS settings with natural values of model parameters lead to Dark Radiation predictions just below the present observational bounds. Barring a discovery, rather modest improvements of present Dark Radiation limits can rule out many of these most simple and generic variants of the LVS.

Speaker: Dr Lukas Witkowski (Heidelberg University)

Slides DR_Paris_LTW.pdf

15:50 Dark Radiation in Fibred LARGE Volume Compactifications

Dark radiation is a compelling extension to $\Lambda$CDM: current experimental results hint at $\Delta N_{\rm eff} \simeq 0.5$, which is increased to $\Delta N_{\rm eff} \simeq 1$ if the recent BICEP2 results are included. In recent years dark radiation has been considered in the context of string theory models such as the LARGE Volume Scenario of type IIB string theory, forging a link between present-day cosmological observations and models of physics at the Planck scale. In this talk I will consider fibred realisations of the LARGE Volume Scenario, in which the bulk volume is stabilised by two moduli instead of one. Consequently, the lightest modulus no longer corresponds to the compactification volume but instead to a transverse direction in the bulk geometry. I will focus on scenarios in which sequestering of soft masses is achieved by localising the Standard Model on D3 branes at a singularity. The fraction of dark radiation produced in such models vastly exceeds experimental bounds, ruling out the fibred sequestered LARGE Volume Scenario as a model of the early Universe.

Speaker: Stephen Angus (University of Oxford)

Slides 5.Angus_Planck2014.pdf

14:30 → 16:10 SuSy and non-SuSy phenomenology

Convener: Gautam Bhattacharyya (Variable Energy Cyclotron Centre (VECC))

14:30 Sterile neutrino dark matter in Inverse Seesaw realizations

In this work we consider a simple extension of the Standard Model involving additional fermionic singlets and assume an underlying inverse seesaw mechanism for neutrino mass generation. In a first stage we determine which are the minimal inverse seesaw realisations that account for neutrino data while at the same time complying with all experimental requirements (electroweak precision tests and laboratory constraints). We show that in the class of models giving rise to a 3-flavour mixing scheme, only two mass scales are relevant (the light neutrino mass scale, $m_\nu$ and the mass of the right-handed neutrinos, $M_R$) while in the case of a 3+1-mixing scheme, an additional mass scale ($\mu$ $\in[m_\nu,M_R]$) is required. Depending on its mass, the light sterile neutrino that is present in the latter class of models can give an explanation for the reactor anomalies or provide a possible candidate for the dark matter of the Universe. In a second stage we discuss the viability of the warm dark matter hypothesis imposing the present bounds on abundance, structure formation and neutrino radiative decay width.

Speaker: Mr Michele Lucente (LPT Orsay & SISSA)

Slides Planck_2014.pdf

14:50 Inflation and majoron dark matter in the seesaw mechanism

I will present a model where spontaneous breaking of global lepton number within the seesaw mechanism leads to a consistent inflationary scenario consistent with the recent CMB B-mode observation by the BICEP2 experiment. The model includes a natural dark matter candidate and can account for the baryon asymmetry of the universe through leptogenesis.

Speaker: sofiane boucenna

Slides boucenna_majoron-Inflation.pdf

15:10 Dark Matter and Neutrino Masses in Gauge Theories for Baryon and Lepton Numbers

I present extensions of the Standard Model, where the global symmetries baryon and lepton number are gauged and subsequently spontaneously broken. These theories are consistent with collider bounds and cosmology, and have intriguing consequences due to the requirement of anomaly cancellation: lepto-baryon fields that have to be introduced can be a dark matter candidate and/or generate neutrino masses. I discuss symmetric and asymmetric dark matter, as well as the generation of neutrino masses in these extensions.

Speaker: Michael Duerr (MPI fuer Kernphysik, Heidelberg)

Slides Duerr_Planck2014.pdf

15:30 Flavour symmetries after the first LHC phase

Based on flavour symmetries only, there are two ways to give rise to an effective description of flavour physics in the quark sector close to the CKM picture: one is based on $U(3)_q\times U(3)_u\times U(3)_d$, and the other on $U(2)_q\times U(2)_u\times U(2)_d$ (or equivalent symmetries). In this context we analyze the current status of flavour physics measurements and we compare their impact, in the specific case of supersymmetry, with the direct searches of new particles at the LHC, present or foreseen.

Speaker: Dr Dario Buttazzo (Insitute for Advanced Study, TU Munich)

Slides Buttazzo.pdf

15:50 The neutron EDM vs flavour violating D-meson decays

We derive bounds on the electric and chromo-electric dipole moments of the charm quark. The second one turns out to be particularly strong, and we quantify its impact on models that allow for a sizeable flavour violation in the up quark sector, like flavour alignment and Generic U(2)^3. In particular we show how the bounds coming from the charm and up CEDMs constrain the size of new physics contributions to direct flavour violation in D decays. We also specialize our analysis to the cases of Supersymmetry with split families and composite Higgs models. The results exposed in this talk motivate both an increase in experimental sensitivity to fundamental hadronic dipoles, and a further theoretical exploration of both hadronic EDMs and flavour violating D decays.

Speaker: Filippo Sala (IPhT, CEA/Saclay and CNRS)

Slides FilippoSala_Planck.pdf

16:10 → 16:40 Coffee Break

16:40 → 18:00 Cosmology

Convener: Eung Jin Chun (Korea Institute for Advanced Study)

16:40 Conformal description of inflation and primordial B-modes

We describe an extended class of the conformally invariant theories which takes T-model as well as Starobinsky model as special cases. We derive a general relation between the two slow-roll parameters, and find that a large class of models can be embedded. Such models include more general Starobinsky-like inflation as well as the chaotic inflation model with a large tensor-to-scalar ratio consistent with the BICEP2 result.

Speaker: Jinn-Ouk Gong (A)

Slides 2014-05-29_Planck2014.pdf

17:00 Cosmological Signatures of a UV-Conformal Standard Model

Quantum scale invariance in the UV has recently attracted renewed interest as a solution to the hierarchy problem arising in the Standard Model (SM). In this work we explore the cosmological signatures at the electroweak scale of models where scale invariance is broken in a "hidden" sector coupling to the SM via gauge interactions only. We find that these models may naturally give rise to a strong electroweak phase transition generating a large stochastic gravitational wave background to be searched for by future space-based detectors such as eLISA and BBO. The requirement of a consistent cosmological history of the Universe also provides information on the breaking of scale invariance.

Speaker: Glauber Carvalho Dorsch (University of Sussex)

Slides Dorsch.pdf

17:20 Effect of interaction terms on particle production due to time-varying mass

It is known that time-varying masses cause particle production. We shall discuss particle production of interacting bosons and fermions in the context of supersymmetric models. In such models both bosonic and fermionic particles are produced, since their masses are controlled by the same background scalar fields. We shall focus on the resulting abundance of fermions, taking into account supersymmetry breaking effects.

Speaker: Dr Seishi Enomoto (Faculty of Physics, University of Warsaw)

Slides Planck2014(20140529)_pdf.pdf Planck2014(20140529).pptx

17:40 Globular Clusters as laboratories of physics beyond the standard model: Neutrino magnetic moment and Axions.

Stellar evolution is quite sensitive to the inclusion of new low-mass particles (such as axions or neutrinos with novel electromagnetic properties) which have weak interactions with matter. Such particles escape almost freely without having interactions with matter, implying changes in the evolution and properties of the star by achieving a new energy loss channel. These changes produced by these new low-mass particles or neutrinos with novel electromagnetic properties have a direct impact on the way that the star loses energy. So, the evolution path and physical properties of a star when considering these new particles (or neutrinos with novel electromagnetic properties) are different if compared with the case in which such particles are not considered, leaving a window open to put constraints when comparing them with observations of stars. In this work, new constraints in the light of the most recent data from globular clusters (GC) and updated stellar evolution codes are presented, paying special attention to the systematic and statistical uncertainties in order to make an easy comparison between terrestrial and astronomical constraints. Specifically, we study the impact of the neutrino magnetic moment (NMM) and axions on the tip of the red giant branch (TRGB). The latter has been identified as a sensitive indicator of exotic energy loss mechanisms in low-mass stellar interiors. Enhanced neutrino emission due to NMM and axion emission for different coupling strengths with electrons has been implemented in our stellar evolution code, PGPUC. Then, for both cases, we have computed stellar evolution tracks, to reach the TRGB for the GC: M5 (NGC5904) and M3 (NGC5272). This GC the best candidate of GCs where we imposed stringent criteria that provide us with clean color-magnitude diagrams and straightforward interpretation of the results.

Speaker: Nicolas Viaux (Pontificia Universidad Católica de Chile)

Slides Viaux.pdf

16:40 → 18:00 Flavor

Convener: Dr cecilia tarantino (University Roma Tre)

16:40 Penguin loops in the Randall-Sundrum model

The Randall-Sundrum model addresses the gauge and flavour hierarchy in a unified (extra-dimensional) framework. The model is, by itself, non-renormalizable. This makes predictions for loop-mediated observables a delicate issue. I will present a general strategy for computing penguin loops in the five-dimensional theory via a matching procedure onto a 4D Lagrangian with higher-dimensional operators. This allows us to obtain predictions for various precision observables such as anomalous magnetic moments or radiative flavour-changing transitions like $\mu \to e\gamma$.

Speaker: Juergen Rohrwild (University of Oxford)

Slides Planck2014_Rohrwild.pdf

17:00 A new region in supersymmetry for the muon g-2 and electron EDM

To explain the muon g-2 anomaly in supersymmetric standard models demands the typical sparticle mass scale around O(100) GeV, while the recent null result of the electron EDM measurement by the ACME collaboration suggests the mass scale to be around O(10) TeV. In this talk, after reviewing standard resolutions of this apparent confliction, we propose a new parameter region in supersymmetry through so-called enhanced muon Yukawa coupling scenario. In this scenario, the muon Yukawa couplings appeared in the diagrams relevant for the muon g-2 are enhanced compared to the usual muon Yukawa coupling responsible for the muon mass, through a cancellation between tree and large enough 1-loop contributions, still not spoiling the perturbativity of the theory. Consequently, sparticles of the mass typically larger than TeV scale become responsible for the muon g-2 anomaly with PeV scale mu tanb or A-term. Also the upper bound on CP phases set by the electron EDM measurement can be ameliorated in this scenario.

Speaker: Dr Sang Hui Im (Seoul National University)

Slides SH_Im_Planck.pdf

17:20 FCNC top quark decays and new physics

In this talk we discuss the decays of the top quark, focusing on the flavor-changing neutral currents (FCNC) modes, as well as the modes with multilepton final states. The FCNC modes are very suppressed within the Standard Model (SM) of electroweak interactions, but could be enhanced in extension of the SM, such as the two-Higgs doblet model and Supersymmetry. The decay modes with multi-lepton final states, such as t->b W l+ l-, could have a branching ratio well above the expected Br's for FCNC modes within the SM. We also discuss the expected BR's that could be studied at the LHC at CERN.

Speaker: Dr Lorenzo Diaz-Cruz (FCFM-BUAP)

Slides Tophix-Dks1.pdf

17:40 Radiative generation of quark masses and mixing angles in the 2HDM

I will present a framework to generate the quark mass hierarchies and mixing angles by extending the Standard Model with one extra Higgs doublet. The charm and strange quark masses are generated by small quantum effects, thus explaining the hierarchy between the second and third generation quark masses. All the mixing angles are also generated by small quantum effects: the Cabibbo angle is generated at zero-th order in perturbation theory, while the remaining off-diagonal entries of the Cabibbo-Kobayashi-Maskawa matrix are generated at first order, hence explaining the observed hierarchies in the CKM matrix. The values of the radiatively generated parameters depend only logarithmically on the heavy Higgs mass, therefore this framework can be reconciled with the stringent limits on flavor violation by postulating a sufficiently large new physics scale.

Speaker: Ana Solaguren-Beascoa (Techinsche Universität München)

Slides presentation.pdf

16:40 → 18:00 Formal

Convener: Angel Uranga (I)

16:40 Geometrical hierarchies in classical supergravity

We introduce a $N=1$ supergravity model with a very simple hidden sector coupled to the electroweak gauge and Higgs sectors of the MSSM. At the classical level, supersymmetry and $SU(2) \times U(1)$ are both spontaneously broken, with vanishing vacuum energy. Two real flat directions control the two symmetry-breaking scales $m_{3/2}$ and $m_Z$. The two massless scalars are a gauge singlet and the standard Higgs boson. All other unobserved particles have masses of order $m_{3/2}$. This may be a new starting point for studying the compatibility of naturalness with the observed mass hierarchies.

Speaker: Hui Luo (Istituto Nazionale di Fisica Nucleare Sezione di Padova)

Slides geometrical_hierarchies_in_classical_supergravity.pdf

17:00 The Higgs mass, the SUSY breaking scale and String Theory

We consider a scheme in which SUSY is broken at a large scale $M_{SS}$ well above the electroweak scale $M_{EW}$, such that it does not provide a solution to the hierarchy problem but rather stabilizes the SM vacuum. Under standard unification assumptions, we compute the Higgs mass as a function of the SUSY breaking scale, obtaining for $M_{SS}\geq 10^{10}$ GeV a very constrained result: $m_H = 126 ± 3$ GeV, consistent with CMS and ATLAS results. This large scale for $M_{SS}$ can be motivated by the recent BICEP2 results. We explore the possible value of $M_{SS}$ consistent with gauge coupling unification and closed string fluxes as the main source of SUSY breaking, in the context of SU(5) F-theory GUT’s. These two requirements fix $M_{SS}$ at an intermediate scale around $10^{10}$ GeV. We also study how the fine-tuning of a light SM Higgs constrains the structure of soft SUSY breaking terms.

Speaker: Ms Irene Valenzuela (IFT UAM/CSIC)

Slides talk_planck_valenzuela.pdf

17:20 The Higgs boson mass and SUSY spectra in 10D magnetized SYM theory

In a previous work [1], we constructed a phenomenological model based on the 10D Supersymmetric Yang-Mills theory with magnetic fluxes in extra dimensional space. We compactified the 10D SYM theory on three factorizable tori and introduced the magnetic fluxes preserving only the 4D N=1 SUSY. The magnetic fluxes originate the complicated flavor structures of the standard model, gauge symmetries, three generations, and furthermore, a (semi-) realistic pattern of the masses and mixing angles of the quarks and leptons is obtained without fine-tunings. In this talk, we are focusing on the 126 GeV Higgs boson, but it depends on the low scale SUSY spectra through loop corrections. We can consider two types of SUSY breaking mediation mechanisms in this model straightforward, the moduli and anomaly mediations. We study the precise SUSY spectra at the low energy scale induced by them. Furthermore, we estimate the Higgs boson mass via the SUSY spectra. [1]H. Abe, T. Kobayashi, H. Ohki, A. Oikawa and K. Sumita, Nucl. Phys. B 870 (2013) 30 [arXiv:1211.4317 [hep-ph]]

Speaker: Mr Keigo Sumita (Waseda Universary)

Slides planck.pdf

17:40 Moduli-induced Baryogenesis

We study a scenario for baryogenesis in modular cosmology and discuss its implications for the moduli stabilization mechanism and the supersymmetry (SUSY) breaking scale. If moduli fields dominate the Universe and decay into the standard model particles through diatonic couplings, the right amount of baryon asymmetry can be generated through CP violating decay of gluino into quark and squark followed by baryon-number violating squark decay. We find that, in the KKLT-type moduli stabilization, at least two non-perturbative terms are required to obtain a sizable CP phase, and that the successful baryogenesis is possible for the soft SUSY breaking mass heavier than O(1) TeV. A part of the parameter space for successful baryogenesis can be probed at the collider experiments, dinucleon decay search experiment, and the measurements of electric dipole moments of neutron and electron. It is also shown that similar baryogenesis works in the case of the gravitino- or the saxion-dominated Universe.

Speaker: Koji Ishiwata (DESY)

Slides Planck14_1405.pdf

16:40 → 18:00 SuSy and non-SuSy phenomenology

Convener: Gautam Bhattacharyya (Variable Energy Cyclotron Centre (VECC))

16:40 The price of being SM-like in SUSY

In supersymmetric models, a CP-even state with SM Higgs couplings mixes with additional, heavier CP-even states, causing deviations in the Higgs couplings from SM values. These deviations are reduced as the heavy states are decoupled with large soft masses, thereby exacerbating the tuning associated with the electroweak scale. This new source of tuning is different from that derived from collider limits on stops, gluinos and Higgsinos. It can be offset with large tan beta in the MSSM, but this compensating effect is limited in the NMSSM with a large Higgs-singlet coupling because electroweak precision tests constrain tan beta to small values. We derive a lower bound on this tuning and show that the level of precision of Higgs coupling measurements at the LHC will probe naturalness in the NMSSM at the few-percent level. This is comparable to the tuning derived from superpartner limits in models with a low messenger scale and split families. The significant improvement in sensitivity of Higgs coupling measurements at the ILC will allow naturalness in these models to be constrained at the per-mille level, beyond any tuning derived from direct superpartner limits.

Speaker: Benedict von Harling (SISSA)

Slides TalkParis.pdf

17:00 Full-Hierarchy Quiver Theories

We discuss a class of models based on a few-site deconstruction of an AdS5 background. We show how the separation between the Planck and weak scales may be obtained as well as the hierarchies of fermion masses. Being weakly coupled, these models have supressed contributions to flavor violation and electroweak precision parameters. In addition, we discuss how the Higgs may be realized as a PNGB in these constructions.

Speaker: Dr Leonardo de Lima (IFT UNESP)

Slides DeLimaPlanck2014.pdf

17:20 Dilaton domination in the MSSM and its singlet extensions

We study the phenomenological implications of a string-motivated scenario in which supersymmetry breaking is triggered by the Dilaton field. We show that for the MSSM there is a tension between the expected Higgs mass and the dark matter relic abundance. This constrains the parameter space and thus leads to testable predictions for LHC-14. We also present examples within the general singlet extension of the MSSM where the aforementioned tension is relaxed and all constraints can be easily accommodated.

Speaker: Lucila Zarate

Slides 6.ZARATE_Planck.pdf

17:40 Generation of non-SUSY two-loop RGEs: Automation

In light of the conspicuous absence of SUSY in the energy range explored by the LHC in 2012, non-supersymmetric BSM scenarios are becoming more and more attractive. One key ingredient in exploring such BSM physics are the renormalization group equations (RGEs) that are essential for extrapolating the theory to higher energy scales. Although the 2-loop RGEs for a general quantum field theory are known since a long time, there is no easy-to-use tool that automatically generates them (for supersymmetric models, see the Mathematica package SARAH by F. Staub). In this talk, I will present a Python programs called PyR@TE that generates the RGEs for an arbitrary model that is specified in terms of its gauge group and particle content.

Speaker: Florian Lyonnet (LPSC)

Slides Planck14.pdf

18:00 → 18:30 Social Event: Soirée Magie

20:00 → 22:20 Social Event: Banquet

Friday, 30 May

09:00 → 10:30 Plenary

Convener: Jean-Pierre Derendinger (Universitaet Bern (CH))

09:00 On the large impact of small Dark Matter/Standard Model interactions

TBA

Speaker: Thomas Hambye

Slides 1.Hambye.pdf

09:30 Z' and Dark Matter

Speaker: Yann Mambrini (LPT Orsay)

Slides Mambrini.pdf

10:00 Solving the Milky Way satellite problem with dark matter interactions

TBA

Speaker: Celine Boehm (LAPP-Laboratoire d'Annecy-le-Vieux de Physique des Particules ()

Slides Boehm_planck2014.pdf

10:30 → 11:00 Coffee Break

11:00 → 12:30 Plenary

Convener: Jean-Pierre Derendinger (Universitaet Bern (CH))

11:00 Same-Sign Tetra-Leptons from Type II Seesaw

The type II seesaw mechanism introduces a triplet boson to explain the observed neutrino masses and mixing. As a result, the model predicts a peculiar signature of a doubly charged boson decaying into di-leptons which is being probed at the LHC. In this talk, I will discuss LHC phenomenology of type II seesaw focusing on novel same-sign tetra-lepton signals which originates from triplet-antitriplet oscillation allowed in some specific parameter space of the model.

Speaker: Eung Jin Chun (Korea Institute for Advanced Study)

Slides 140530_Planck_SS4L.pdf

11:30 What does gravity do with axions?

Speaker: Sacha Davidson (Universite Claude Bernard-Lyon I (FR))

Slides 5.Davidson.pdf

12:00 Reading low energy neutrino data with leptogenesis

Speaker: Pasquale Di Bari (U)

Slides dibari.pdf

14:30 → 16:00 Plenary

Conveners: Emilian Adoni Dudas (Ecole Polytechnique (FR)), Hervé Partouche (Ecole Polytechnique), Marco Cirelli (IPhT CNRS/CEA Saclay), Stephane Lavignac (CEA/IRFU,Centre d'etude de Saclay Gif-sur-Yvette (FR)), karim benakli (LPTHE)

14:30 Leptonic CP violation and see-saw

Speaker: Alexei Smirnov (M)

Slides paris14a.pptx

15:00 Leptogenesis, inflation and the maximal temperature of the universe

TBA

Speaker: Wilfried Buchmuller (DESY)

Slides Buchmuller.pdf

15:30 F-term axion monodromy inflation

TBA

Speaker: Fernando Marchesano Buznego (Unknown)

Slides Marchesano.pdf

16:00 → 16:30 Coffee Break

16:30 → 18:00 Plenary

Conveners: Emilian Adoni Dudas (Ecole Polytechnique (FR)), Hervé Partouche (Ecole Polytechnique), Marco Cirelli (IPhT CNRS/CEA Saclay), Stephane Lavignac (CEA/IRFU,Centre d'etude de Saclay Gif-sur-Yvette (FR)), karim benakli (LPTHE)

16:30 Axion monodromy in warped throats

TBA

Speaker: Angel Uranga (CERN)

Slides uranga.pdf

17:00 Transplanckian scattering: Where do we stand?

Speaker: Gabriele Veneziano (CERN)

Slides Planck2014.Veneziano.pdf

17:30 Dark Matter from the Multiverse: SUSY and Axions

TBA

Speaker: Lawrence Hall (University of California Berkeley)

Slides Multiverse_-_LJH.pdf