Conveners
Particle Physics
- Albert De Roeck (CERN)
Particle Physics: Particle Physics
- Troels Petersen (University of Copenhagen (DK))
Particle Physics: Particle Physics
- Herbi Dreiner (Bonn University)
Particle Physics: Particle Physics
- Oliver Buchmueller (Imperial College Sci., Tech. & Med. (GB))
Particle Physics: Particle Physics
- Christoph Weniger (University of Amsterdam)
Particle Physics: Particle Physics
- Christopher McCabe
Filippo Sala
(CEA/Saclay and CNRS)
23/06/2014, 14:30
Particle Physics
Presentation
We extend the Standard Model with a new particle, chosen from those that are automatically stable without adding any extra symmetry to the theory. Despite being a potential Dark Matter candidate, other motivations for such a new state will be discussed, like the stabilisation of the EW vacuum. Its phenomenology is controlled by a single parameter, its mass, which is fixed in the multi-TeV...
Roberto Franceschini
(E)
23/06/2014, 14:45
Particle Physics
Presentation
We study the determination of the symmetry that stabilizes a dark matter (DM) candidate produced at colliders. Our question is motivated per se, and by several alternative symmetries that appear in models that provide a DM particle. To this end, we devise a strategy to determine whether a heavy mother particle decays into one visible massless particle and one or two DM particles. The counting...
LianTao Wang
(University of Chicago)
23/06/2014, 15:00
Particle Physics
Supersymmetry is the most prominent candidate for new physics beyond the Standard Model. However, we have not seen any sign of it during the LHC run 1. In this talk, I will give an overview of the current status of SUSY, including important questions such as naturalness and Higgs physics. I will also remark on promising directions for further pursuit.
Troels Petersen
(University of Copenhagen (DK))
23/06/2014, 15:20
Particle Physics
As the last and most advanced results of the Run1 ATLAS and CMS SUSY searches are in the process of being finalized, the status of these searches after LHC Run1 is that no indication for any signal has yet been seen. All data has been compatible with the estimated standard model backgrounds, and limits have therefore been set on the masses of various supersymmetric particles. I will cover a...
Ms
Pearl Sandick
(University of Minnesota)
23/06/2014, 15:40
Particle Physics
Presentation
Recent experimental results from the LHC have placed strong constraints on the masses of colored superpartners.
Additionally, direct dark matter searches put a strong upper limit on cross sections of interactions between the WIMP and quark sectors.
However, leptophilic versions of the MSSM can potentially survive these constraints while explaining the observed abundance of dark matter. We...
Mrs
Elisabetta Baracchini
(The University of Tokyo)
23/06/2014, 16:30
Particle Physics
Presentation
We will present the latest result from the MEG experiment, based on the data collected at the Paul Scherrer Institut (PSI), in search of the Lepton Flavour Violating (LFV) decay $\mu^+ \to e^+ \gamma$. Such decay is forbidden within the Standard Model (SM), nevertheless most of its viable extensions predict a branching ratio in the 10$^{−14}$ to 10$^{−12}$ range. An observation of the $\mu^+...
Giampiero Mancinelli
(CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France)
23/06/2014, 16:45
Particle Physics
Rare decays of beauty hadrons test the flavour structure of the Standard Model and of other theories at the level of quantum corrections. They provide information on the couplings and masses of heavy virtual particles appearing as intermediate states. A review of recent results from the the LHCb, ATLAS, and CMS collaborations on new physics searches in b -> s transitions will be presented.
Prof.
Toyoko Orimoto
(Northeastern University)
23/06/2014, 17:05
Particle Physics
Presentation
The ATLAS and Compact Muon Solenoid (CMS) Experiments are general-purpose particle detector experiments at the Large Hadron Collider (LHC) at CERN. ATLAS and CMS have successfully collected a large dataset consisting of approximately 20/fb (5/fb), of proton-proton collisions at a center-of-mass energy of 8 TeV (7 TeV). In addition to clarifying the origins of electroweak symmetry breaking, one...
Tristan Arnoldus Du Pree
(Universite Catholique de Louvain (UCL) (BE))
23/06/2014, 17:25
Particle Physics
Presentation
Besides studies of the Higgs boson, supersymmetry, and dark matter, the ATLAS and CMS experiments conduct a broad program of searches for more exotic new physics possibilities. These investigations include searches for heavy gauge bosons, leptoquarks, long-lived particles, vector-like quarks, excited leptons, heavy neutrinos, extra dimensions, black holes, and many other models. This...
LianTao Wang
(University of Chicago)
23/06/2014, 17:45
Particle Physics
LHC run 2 will significantly enhance the reach of new physics searches. In this talk, I will give an overview of the new ground to be covered and new questions to be answered. I will attempt to identify a set of top physics targets, as well as some challenges.
Albert De Roeck
(CERN),
Albert De Roeck
(CERN)
23/06/2014, 18:05
Particle Physics
In 2012 the Large Hadron Collider, at CERN, Geneva, Switzerland, discovered a new type of particle, a Higgs Boson, which is anticipated to have played a crucial role at the beginning of the Universe, giving mass to the elementary particles. This paradigm shifting discovery was made by large
experimental collaborations analysing the data of the LHC collected in the years 2011and 2012. It has...
Prof.
Guenakh Mitselmakher
(University of Florida)
26/06/2014, 14:30
Particle Physics
Presentation
Results of studies at the LHC collider by the CMS and ATLAS experiments of the recently discovered Higgs boson are presented. The measured properties of the new particle are consistent with the predictions of the Standard Model.
Renjie Wang
(Northeastern University (US))
26/06/2014, 14:50
Particle Physics
Presentation
The results from searching for invisible decay of Higgs bosons at LHC are presented. No significant excess is found beyond the Standard Model prediction, and new limits are set on the production cross section times invisible branching fraction, as a function of the Higgs boson mass, using a combination of data collected in proton-proton collisions at center-of-mass energies of 7 TeV and 8 TeV...
Johann Collot
(Centre National de la Recherche Scientifique (FR))
26/06/2014, 15:10
Particle Physics
Presentation
The discovery of a Higgs boson, consistent with the Standard Model, has heralded a new era in which fundamental scalar fields may be safely called to play a central rôle to solve long-lasting physics questions : grand unification of forces, supersymmetry, dark matter, cosmic inflation... To express it in other words, if the sophisticated Brout-Englert-Higgs mechanism really works as we believe...
Jernej F. Kamenik
(Jozef Stefan Institute)
26/06/2014, 15:30
Particle Physics
We investigate the impact of hypothetical new neutral light particles on the tiny width of a light Higgs boson. Reviewing the possible signatures in the Higgs decay modes with missing energy, in many cases simply preventing these modes from being dominant suffices to set tight model-independent constraints on the masses and couplings of the new light states. We then apply this analysis to...
Thomas David Jacques
(Universite de Geneve (CH))
26/06/2014, 16:30
Particle Physics
Presentation
As beyond-standard-model physics continues to elude discovery at the LHC, it becomes increasingly important to ask what we can learn about dark matter in a model-independent way. Effective Field Theories have become popular as a way construct model-independent constraints on dark matter, but at LHC energies it is crucial to understand their significance and limitations. I will present ways to...
Andrea De Simone
(CERN),
Andrea De Simone
(Ecole Polytechnique Federale de Lausanne (CH))
26/06/2014, 16:50
Particle Physics
I discuss alternatives to Effective Field Theory to pursue dark matter searches at the LHC, and propose some benchmark scenarios
for fairly model-independent strategies that LHC experiments can follow in the investigation of DM.
Dr
Emanuele Re
(University of Oxford)
26/06/2014, 17:10
Particle Physics
Presentation
I will discuss theoretical uncertainties in predictions for "mono-jet" signals, and show how these predictions can be affected by extra radiation due to QCD emissions. I'll present results obtained by matching parton showers with NLO corrections, as implemented in the publicly-available MC program POWHEG-BOX, that I will quickly overview.
Time permitting, I'll also show how further...
Valerio Rossetti
(Stockholm University (SE))
26/06/2014, 17:30
Particle Physics
Presentation
We present results by the ATLAS and CMS experiments on a search for new phenomena in pp collision events with one high momentum jet and large missing transverse energy. The data are compared to the SM prediction of the background, dominated by the W/Z+jets production with neutrinos and mis-reconstructed charged leptons in the final state. The results are interpreted in the context of different...
Andy Nelson
(University of California Irvine (US))
26/06/2014, 17:50
Particle Physics
Presentation
Searches for mono-W and Z bosons are presented in the hadronic+MET and dileptonic+MET channels using the ATLAS experiment and the mono-lepton+MET channel using CMS at the Large Hadron Collider. The full 2012 data set produced at a center of mass energy of 8 TeV is used comprising 20 fb-1. No statistically significant deviation from the Standard Model is observed. Limits are set on the mass...
Christopher McCabe
27/06/2014, 14:30
Particle Physics
Interplay of direct, indirect and collider searches
Dr
Takashi Toma
(Durham University)
27/06/2014, 14:50
Particle Physics
Presentation
We investigate a Z3 symmetric model with radiative neutrino masses at two loop level. A particle which can be Dark Matter in the model is either of a Dirac fermion or a complex scalar as a result of unbroken Z3 symmetry. In addition to typical annihilation processes of Dark Matter, semi-annihilation processes give an important effect when the relic density is calculated together with some...
Luca Panizzi
(University of Southampton)
27/06/2014, 15:05
Particle Physics
Presentation
Searches for events with Missing Transverse Energy at the LHC are among the most powerful methods for the identification of Dark Matter candidates. For this purpose, selection and kinematic cuts have often been designed assuming that the mass hierarchies between the Dark Matter candidate and strongly-interacting states of the model are large, as it is generally the case in supersymmetric...
Giorgio Busoni
(SISSA, Trieste)
27/06/2014, 15:25
Indirect searches can be used to test dark matter models against expected signals in various channels, in particular antiprotons. With antiproton data available soon at higher and higher energies, it is important to test the dark matter hypothesis against alternative astrophysical sources, {\it e.g. } secondaries accelerated in supernova remnants.
We investigate the degeneracy of the two...
Mr
Camilo Garcia Cely
(Technical University Munich)
27/06/2014, 15:40
Particle Physics
Presentation
The Inert Doublet Model contains a neutral stable particle which is a viable dark matter candidate.
I will discuss the indirect signatures of this model in gamma-rays when the dark matter mass is at the TeV scale.
In particular, I will consider the interplay between the annihilation process into two photons and the internal
bremsstrahlung process $DM DM \to W^+W^- \gamma$. I will show that...
Glennys Farrar
(NYU)
27/06/2014, 16:30
Particle Physics
The H dibaryon is a potentially very deeply-bound 6-quark state — uuddss -- with a mass of ~1.5 GeV. It is a spin-0, flavor-singlet, scalar carrying baryon-number of 2. As will be reviewed, such a particle would have evaded detection in accelerator and other searches. (Preliminary lattice simulations show it is deeply bound compared to other 6-quark states, but they are not yet good enough...
Iason Baldes
(University of Melbourne)
27/06/2014, 16:45
Particle Physics
Presentation
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 the role CP violating $2 \leftrightarrow 2$ annihilations can play -- together with the usual $1 \leftrightarrow 2$ decays and inverse decays -- in determining the final asymmetry. I will present a simple toy model to point out...
Dr
Emiliano Molinaro
(TUM)
27/06/2014, 17:00
Particle Physics
Presentation
The scotogenic model is one of the simplest scenarios for physics beyond
the Standard Model that can account for neutrino masses and dark matter at
the TeV scale. It contains another scalar doublet and three additional singlet
fermions (Ni), all odd under a Z2 symmetry. We examine
the possibility that the dark matter candidate, N1, does not reach thermal
equilibrium in the early Universe...
Csaba Balazs
(Monash University)
27/06/2014, 17:15
Particle Physics
Presentation
I present a model independent analysis of thermal dark matter constraining its mass and interaction strengths with data from astro- and particle physics experiments. Using effective field theory to describe interactions of dark matter particles I cover real and complex scalar, Dirac and Majorana fermion, and vector boson dark matter candidates. I show posterior probability distributions for...
Dr
Jan Heisig
(RWTH Aachen University)
27/06/2014, 17:30
Particle Physics
Presentation
Supersymmetric scenarios where the lightest superparticle (LSP) is the gravitino are an attractive alternative to the widely studied case of a neutralino LSP. A strong motivation for a gravitino LSP arises from the possibility of allowing higher reheating temperatures which are required by thermal leptogenesis and can be considered more likely in the light of the recently reported BICEP2 data....
Yi Cai
27/06/2014, 17:45
Particle Physics
Presentation
We study dark matter (DM) models in which there are two dark sector particles, $\chi_1$ and $\chi_2$, of near mass. In such models, co-annihilation of $\chi_1$ and $\chi_2$ may be the dominant process controlling the DM relic density during freezeout in the early universe. In this scenario, there is no significant contribution to direct and indirect detection signals, unless there exists an...
Patrick Steppeler
(WWU Münster)
27/06/2014, 18:00
Particle Physics
Presentation
A powerful method to constrain the MSSM parameter space is to compare the predicted dark matter relic density with cosmological precision measurements, in particular the Planck data. On the particle physics side, the main uncertainty for a given spectrum arises from the (co-)annihilation cross sections of the dark matter particle. After a motivation for including higher order corrections in...
Mr
Michele Re Fiorentin
(University of Southampton)
27/06/2014, 18:15
Particle Physics
Presentation
I will briefly review the main aims and concepts of leptogenesis, analysing different possible realisations. Particular attention will be devoted to the so-called $N_2$-dominated scenario, both in its unflavoured and flavoured versions. Its main features will be pointed out, as well as the impact of possible relevant corrections. I will then consider the conditions required by strong thermal...
