SUSY: Model-building and Phenomenology

2 Dec 2013, 09:00 → 4 Dec 2013, 18:00 Asia/Tokyo

Lecture Hall (Kavli IPMU, the University of Tokyo)

Overview

 

The workshop aims to discuss how important (or not) low-energy SUSY is based on the latest experimental results. Other BSM physics is also an important subject in the workshop. We would like to discuss recent developments and future directions in these fields.

Dates
December 2 (Mon) - 4 (Wed), 2013
Venue
Lecture Hall (1F), Kavli IPMU main building
Accommodation
Participants are expected to arrange their accommodation by themselves. Hotel information around Kashiwa is provided in Accommodation page.
Organizers
Koichi Hamguchi (U. Tokyo), Junji Hisano (Nagoya U.), Masahiro Ibe (ICRR, U. Tokyo),     Shigeki Matsumoto (Kavli IPMU), Takeo Moroi (U. Tokyo), Tsutomu Yanagida (Kavli IPMU)
Contact
Address: Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), the University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa City, Chiba 277-8583, Japan
Tel: +81-4-7136-5979 (Rie Ujita)
e-mail: shigeki.matsumoto@ipmu.jp (Shigeki Matsumoto, Rie Ujita (secretary))

 

 

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Sponsor
Kavli IPMU (WPI), Grant-in-Aid for Scientific Research(A), MEXT

 

 

                    

 

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Monday 2 December

09:00 → 09:30 Coffee and Breakfast

09:30 → 11:30 Morning session

Chair: YANAGIDA, Tsutomu (Kavli IPMU)

09:30 Is there Life after Higgs?

Speaker: Hitoshi Murayama (Kavli IPMU)

Slides Murayama.pdf

10:30 SUSY in the light of the Higgs discovery

Speaker: Graham Ross (Oxford U.)

Slides G.RossIPMUtalk.pdf

11:30 → 13:00 Lunch

13:00 → 15:00 Afternoon session 1

Chair: MOROI, Takeo (U. Tokyo)

13:00 Indications of low-scale SUSY

Speaker: Norimi Yokozaki (Kavli IPMU)

Slides Yokozaki.pdf

14:00 Theory Predictions for the Higgs Mass and Implications for Phenomenology

Supersymmetric models allow the calculation of the Higgs masses in terms of the model parameters. Together with the LHC measurement of the Higgs mass, this can be used to exclude whole regions of the parameter space that predict the wrong mass. However, great care has to be taken regarding uncertainties in the prediction. We consider the light Higgs boson of the MSSM and compare the expermimental results to the theory prediction, including leading terms at three-loop order. We also consider constraints from Dark Matter searches. We find that there are large regions of the MSSM that are both consistent with these constraints and within the reach of the LHC at 14 TeV.

Speaker: Philipp Kant (Humboldt U.)

Slides kant.pdf

15:00 → 16:00 Teatime

16:00 → 17:40 Afternoon session 2

16:00 Gaugino physics at LHC

Many models of supersymmetry predict scalar-fermion split spectrum. Split SUSY and pure gravity mediation are examples. In this talk, we discuss future gaugino physics as probes of such models at LHC, and we clarify an issue of discrepant results of next-to-leading order gaugino mass calculations in literature.

Speaker: Sunghoon Jung (KIAS)

16:25 Multilepton signals of gauge mediated supersymmetry breaking at the LHC

Working in the framework of General Gauge Mediation (GGM) we briefly discuss how the GGM parameter space is constrained by requiring the Higgs mass to be at 125 GeV. In particular we explain to what extent the GGM parameter space is still a good collider signature generator for LHC. We then focus on models where the low mass region of the superpartner spectrum consists of the three generations of charged sleptons and the nearly massless gravitino. Motivated by the fact that both the hierarchies among the stau and the other sleptons can be realized in gauge mediation models, we present spectra with either stau NLSP or selectron/smuon co-NLSP. We discuss if and how such models can provide an explanation for the anomalous four lepton events recently observed by the CMS collaboration, while satisfying other existing experimental constraints. Generically, these models also give rise to final states with more than four leptons, offering alternative channels in which they can be probed and we estimate the corresponding production rates at the LHC. Finally, we comment on how the presence of a light stau at the edge of the LEP limit in our best fit benchmark motivates further investigation about the possible impact of LHC searches on the stau mass bound. - Reference:: arXiv:1310.0018, arXiv:1303.0870

Speaker: Diego Redigolo (ULB)

Slides Redigolo.pdf

16:50 Probing Bino Contribution to Muon g-2

We study SUSY models in which Bino contributions solve the muon g-2 anomaly. The contributions are enhanced by large left-right mixing of the smuons. However, it is constrained by the vacuum stability condition of the slepton Higgs potential. Therefore, there are upper bounds on masses of sleptons and Bino. When the slepton soft masses are universal, the upper bound on the smuon mass becomes 330 (460) GeV in order to solve the g-2 anomaly at the 1 sigma (2 sigma) level. It is within the reach of LHC and ILC. If the stau is heavier than the smuon, the bound can be as large as 1.4 (1.9) TeV. Such non-universal slepton mass spectrum generically predicts too large LFV/CPV. We show that the models are expected to be probed by LHC/ILC and LFV/CPV complementarily in future. - Reference:: 1309.3065, 1310.4496

Speaker: Teppei Kitahara (U. Tokyo)

Slides kitahara.pdf

Tuesday 3 December

09:00 → 09:30 Coffee and Breakfast

09:30 → 11:30 Morning session

Chair: HAMAGUCHI, Koichi (U. Tokyo)

09:30 SUSY results from the ATLAS experiment

Speaker: Shimpei Yamamoto (U. Tokyo)

Slides Yamamoto.pdf

10:30 LHC physics prospects

Speaker: Naoko Kanaya (U. Tokyo)

Slides Kanaya.pdf

11:30 → 13:00 Lunch

13:00 → 15:00 Afternoon session 1

Chair: IBE, Masahiro (U. Tokyo)

13:00 Towards an (un)Natural Weak Scale

Speaker: Joshua Ruderman (U.C. Berkeley)

Slides Ruderman.pdf

14:00 Where is SUSY?

Speaker: Tomer Volansky (Tel-Aviv U.)

15:00 → 15:15 Group photo shoot

15:15 → 16:00 Teatime

16:00 → 17:40 Afternoon session 2

16:00 PLANCK mission, Starobinsky inflation and its realization in old-minimal supergravity

It is argued that the recent PLANCK data about the CMB favors some particular inflationary models, such as the Starobinsky inflation and the Higgs inflation. It is, therefore, important to reconsider the embedding of the Starobinsky inflation into supergravity and string theory, towards expanding the current phenomenological status of the Starobinsky inflation to a fundamental theory of gravity, like superstrings. It is demonstrated that there are good prospects for that, because the supergravity realization of the Starobinsky inflation leads to the no-scale supergravity models favored by many superstring compactifications, the supersymmetry breaking scale appears to be arbitrary, and a (tree level) cosmological constant vanishes. The recently constructed new models of the Starobinsky inflation in supergravity are compatible with all known observations, and offer new possibilities for subsequent reheating and leptogenesis. - Reference:: e-Print: arXiv:1309.7494, together with T. Terada (U. of Tokyo)

Speaker: Sergey Ketov (Tokyo Metropolitan U./Kavli IPMU)

Slides Ketov.pdf

16:25 Lower bound on the gravitino mass in R-symmetry breaking new inflation model

In supersymmetric theories, the R symmetry plays a unique role in suppressing a constant term in the superpotential. In single chiral field models of spontaneous breaking of a discrete R symmetry, an R-breaking field is a good candidate for an inflaton in new inflation models. We show that the model predicts a lower limit on the gravitino mass, 100 TeV. This lower limit is consistent with the observed Higgs mass of 126 GeV when the masses of the stops are of order the gravitino mass scale.

Speaker: Keisuke Harigaya (Kavli IPMU)

Slides Harigaya.pdf

16:50 Probing origins of neutrino masses and baryon asymmetry

We consider the Standard Model extended by two quasi-degenerate right-handed neutrinos. In particular, we consider the case when they are lighter than charged kaon. This simple framework can account for the neutrino oscillations and the baryon asymmetry of the universe at the same time. In this talk we shall summarize the possible constraints on such right-handed neutrinos from direct search experiments and cosmology, and also discuss the strategy how to find and verify right-handed neutrinos by using the future experiments by using kaon.

Speaker: Takehiko Asaka (Niigata U.)

Slides Asaka.pdf

17:15 A first evidence of the CMSSM is appearing soon

We explore the coannihilation region of the constrained minimal supersymmetric standard model (CMSSM) being consistent with current experimental/observational results. The requirements from the experimental/observational results are the 125GeV Higgs mass and the relic abundances of both the dark matter and light elements, especially the lithium-7. We put these requirements on the calculated values, and thus we obtain the allowed region. Then we give predictions to the mass spectra of the SUSY particles, the anomalous magnetic moment of muon, branching fractions of the $B$-meson rare decays, the direct detection of the neutralino dark matter, and the number of SUSY particles produced in a 14TeV run at the LHC experiment. Comparing these predictions with current bounds, we show the feasibility of the test for this scenario in near future experiment.

Speaker: Kenichi Sugai (Saitama U.)

Slides Sugai.pdf

Wednesday 4 December

09:00 → 09:30 Coffee and Breakfast

09:30 → 11:30 Morning session

Chair: MATSUMOTO, Shigeki (Kavli IPMU)

09:30 Cosmological implications for SUSY and its breaking

Speaker: Fuminobu Takahashi (Tohoku U.)

Slides Takahashi.pdf

10:30 Pure Gravity Mediation ~ A heavy sfermion scenario ~

Speaker: Masahiro Ibe (U. Tokyo)

Slides Ibe.pdf

11:30 → 13:00 Lunch

13:00 → 15:00 Afternoon session

Chair: HISANO, Junji (Nagoya U.)

13:00 Scale invariant extensions of the SM with strongly interacting hidden sector

We present a scale invariant extension of the standard model with new QCD-like strong interaction in the hidden sector. A scale $\Lambda_H$ is dynamically generated in the hidden sector by dimensional transmutation, and chiral symmetry breaking occurs in the hidden sector. This scale is transmitted to the SM sector by a real singlet scalar messenger $S$, and can trigger electroweak symmetry breaking (EWSB). Thus all the mass scales in this model arises from the hidden sector scale $\Lambda_H$ which has quantum mechanical origin. Furthermore the lightest hadrons in the hidden sector is stable by the flavor conservation of the hidden sector strong interaction, could be the cold dark matter (CDM). We study collider phenomenology, and relic density and direct detection rates of the CDM of this model. - Reference:: Phys. Rev. Lett. 88, 106 (2011) 141802; arXiv:1103.2571

Speaker: Pyungwon Ko (KIAS)

Slides Ko.pdf

14:00 Scale invariant models for BSM physics and cosmology

Speaker: Mikhail Shaposhnikov (EPFL)

Slides Shaposhnikov.pdf