Pascal Naidon, RIKEN
Recent developments in Efimov physics
Seminar room, Kenkyu honkan 3F
The Efimov effect is a special three-body binding mechanism occurring in the universal regime of particles interacting with large scattering lengths. This mechanism allows the existence of an infinite number of bound states related to each other by scale invariance. Originally predicted 40 years ago in the context of nuclear physics, it has been investigated experimentally over the last few years with ultracold gases of atoms. In this talk, I will introduce the basic theory of this effect, and present some of its experimental observations, as well as related developments in few-body theory.
Alessandro De Angelis, U Udine / ICRR, U Tokyo
Dark matter and new particles with Cherenkov telescopes
Meeting room 1, Kenkyu honkan 1F
Recent results from very-high energy cosmic gamma-ray experiments are reviewed, with emphasis on fundamental physics and search for new particles. The prospects for next generation detectors, CTA in particular, are outlined.
木村元, Shibaura Institue of Technology
量子力学の原理探求をする意義と最近の進展
Seminar room, Kenkyu honkan 3F
量子力学を — アプリオリな数学ではなく — 物理原理に基づき構築する試みを紹介する．これは近年世界的に研究が進められる一方，国内での関心は高いとは言えない．そこで本セミナーの主目的を，物理理論を原理ベースで理解する意義を共有することとする．その上で，量子力学の原理探求の最適な舞台となる「操作主義的な確率論」を説明し，本研究に関する最新の成果を紹介する．
Ryuichiro Kitano, Tohoku University
Higgs mechanism and confinement
Meeting room 1, Kenkyu honkan, 1F
We take both phenomenological and theoretical approaches to this hypothesis, and find that the interpretation seems to show interesting consistencies. In particular, one can identify the rho and omega mesons as the magnetic gauge bosons which provide an explanation of the quark confinement via the dual Meissner effect.
Takayasu Sekihara, KEK
Branching ratios of stopped K^- absorption on light nuclei
Seminar room, Kenkyu honkan 3F
In this seminar we discuss the branching ratios of stopped K^- absorption on light nuclei in order to clarify the low-energy antikaon-nucleon interaction. We investigate the mesonic (K^- “N” -> pi Y) and non-mesonic (K^- “N N” -> Y N) absorption processes of the stopped K^- -light nucleus systems. Here we consider deuteron and helium-4 as the K^- absorption targets with realistic wave functions for them, and calculate the branching ratios to compare with the experimental results. We also give several theoretical interpretations of the branching ratios, especially from viewpoint of the Lambda(1405) structure.
Takumi Ito, KEK
Supersymmetric Model with Long-lived Stau at the LHC
Meeting room 1, Kenkyu honkan 1F Supersymmetric extension of standard model of particle physics is an attractive candidate of TeV energy scale new physics, and an important target of the Large Hadron Collider.
Supersymmetric extension of standard model of particle physics is an attractive candidate of TeV energy scale new physics, and an important target of the Large Hadron Collider.
So far, several techniques have been proposed to discover the new physics, and to measure properties of new particles.
Importantly, however, the strategy that we should take depends on the event topology, namely, details of the new physics; particle contents, mass spectrum, and so on.
In this talk, we study the case that the lightest superparticle (LSP) is the gravitino, and in this case, the next-to-lightest superparticle (NLSP) may have very long lifetime.
In addition, if the NLSP is charged particle, it may be possible to directly observe a track of the NLSP in the detectors; this is an characteristic event signal of such a model.
We discuss how we can probe the model by utilizing the charged track of NLSP, paying particular attention to the case that NLSP is the stau.
Naoki Yamamoto, University of Washington
Holography and anomaly matching for resonances
Meeting room 3, Kenkyu honkan 1F
We show a new universal relation for triangle anomalies, an “anomaly matching” for resonances, in a class of holographic models of QCD. We argue its possible realization and consequences in real QCD.
Jiro Arafune, National Institution for Academic Degrees and University Evaluation
Relic Neutrino の反射、屈折について
Seminar hall, 3 go-Kan
Relic Neutrinoの直接観測は大変困難だが、標的からのニュートリノのコヒーレントな反射、屈折によるrecoilを観測できないか、という理論的な考察が古くからなされてきた。そして、ほとんど不可能という結論がされてきている。主な理由は、コヒーレントな散乱では、ニュートリノが標的へ入射する際と、標的から脱出する際とで、recoilが相殺するからである。それを相殺しない工夫を考察しているのだが、まだよくわからないところがあって、確定的な結論に至っていない。議論していただけると幸いです。
Ken-ichi Nishikawa, UAH/CSAPR
Radiation from accelerated particles in shocks and reconnections
Meeting room 3, Kenkyu honkan 1F
We have investigated particle acceleration and shock structure associated with an unmagnetized relativistic jets propagating into an unmagnetized plasmas. Strong magnetic fields generated in the trailing shock contribute to the electronstransverse deflection and acceleration. We have calculated, self-consistently, the radiation from electrons accelerated in the turbulent magnetic fields. We found that the synthetic spectra depend on the Lorentz factor of the jet, its thermal temperature and strength of the generated magnetic fields. The properties of the radiation may be important for understanding the complex time evolutionand/or spectral structure in gamma-ray bursts, relativistic jets in general, and supernova remnants.
Laila Alabidi, Yukawa Institute for Theoretical Physics, Kyoto University
A further discriminatory signature of inflation
Meeting room 3, Kenkyu honkan 1F
