Kazuya Mameda, Tokyo University of Science
[QCD theory seminar] Nonlinear chiral kinetic theory
Online (Zoom)
The chiral kinetic theory is a pivotal theoretical tool for the transport theory of massless degrees of freedom. Despite various developments, the usual framework contains only linear-order quantum corrections. In this talk, I will explain the formulation of the chiral kinetic theory with the nonlinear-order corrections. Also I will show several findings from this nonlinear chiral kinetic theory, such as nondissipative transport phenomena, a consistency with the Euler-Heisenberg effective theory and a potential issue on regularization.
Johannes Henn, Max-Planck-Institute for Physics)
Finite Scattering Amplitudes From Geometry
Hybrid On-site: Seminar room, Kenkyu honkan 3F Online: Zoom
Scattering amplitudes are key ingredients for cross sections relevant to collider physics. In the last decade, novel geometric ideas have emerged that hint at a completely different formulation of quantum field theory. For example, the Amplituhedron provides, via geometric means, the all-loop integrand of planar scattering amplitudes in maximally supersymmetric Yang-Mills theory. Unfortunately, dimensional regularization, used conventionally for integration, breaks the beautiful geometric picture. This motivates us in this talk to propose a ‘deformed’ Amplituhedron, which is well-defined in four dimensions. Leveraging four-dimensional integration techniques based on differential equations, we compute the four-particle amplitude up to two loops, as a function of the two deformation parameters. The latter can be interpreted as certain mass and energy variables. We observe simple behaviour in various physical limits of the parameters.
Yushi Mura, Osaka University
Electroweak baryogenesis via top-charm mixing
Hybrid On-site: Seminar room, Kenkyu honkan 3F Online: Zoom
Electroweak baryogenesis is a promising scenario to solve baryon asymmetry of the Universe, which is one of big mysteries of particle physics. I will discuss a scenario of electroweak baryogenesis in the two Higgs doublet model with quark flavor mixing. In general, off-diagonal components of quark Yukawa interactions with additional Higgs bosons are strongly constrained by the data for flavor changing neutral currents. However, top-charm quark mixing is not the case, so that a large off-diagonal element can be taken, which can contribute to generating baryon asymmetry of the universe. I will also discuss characteristic predictions for Kaon rare decays in the scenario of top-charm electroweak baryogenesis.
Shigehiro Yasui, Hiroshima U
[QCD theory seminar] Exotic hadrons with charm and bottom flavors: X, Y, Z, Pc, Tcc and hadron interaction
Online (Zoom)
Researches of exotic hadrons have been conducted for a long time since the discovery of quarks by Gell-Mann and Zweig. Recently, there have been many experimental reports on candidates for exotic hadrons with charm and bottom flavors since the discovery of X(3872). Exotic hadrons, whose internal structures are different from normal hadrons, ask us important questions about QCD. What kinds of hadrons should exist? What is the hadron dynamics? What is quark confinement? Those questions may be resolved by studying the properties of exotic hadrons, such as productions, mass spectroscopy and decays. My presentation is divided into two parts. In the former part, I introduce the basics of X, Y, Z, Pc (charm pentaquark), Tcc (double-charm tetraquark), and so on, and review recent experimental and theoretical progress on the study of them. In the latter part, I focus on the recent study with my collaborators for the hadron interaction between a heavy flavored hadron (anti-D meson and B meson) and a nucleon with respecting chiral symmetry and heavy-quark spin symmetry, and discuss the possible extension from exotic hadrons to heavy flavored nuclei as quark many-body systems. I welcome questions and comments from people who are not so familiar with exotic hadrons.
賀沢 秀人氏 (Ph.D., Google ソフトウェアエンジニア / 言語処理学会 理事)
[KEK連携コロキウム] 大規模言語モデルの舞台裏
Online (Zoom)
最近 ChatGPT に代表される大規模言語モデル (Large Language Model; LLM）が大きな話題となっている。LLM以前の自動対話システムでは、宅配便の配達問い合わせのようにあらかじめ決められた話題と目的のために応答を生成するのがやっとであり、しかもその応答も定型文の域を出ないものが多かった。それにたいしLLMは一見人間が応答しているのと区別がつかないやりとりを広範な話題について行うことができるため、様々な応用が期待されるとともに、その発展についていろいろな懸念も生じている。本講演では、LLMとは実際のところどういうものなのかその仕組みを解説するとともに、単なる印象論を越えてLLMについて冷静に議論をするための視点を提供する。
Michiru Niibo, Ochanomizu University
Updated Constraints and Future Prospects on Majoron Dark Matter
Online (Zoom)
Majorons are (pseudo-)Nambu-Goldstone bosons associated with lepton number symmetry breaking due to the Majorana mass term of neutrinos introduced in the seesaw mechanism. They are good dark matter candidates since their lifetime is suppressed by the lepton number breaking scale. We update constraints and discuss future prospects on majoron dark matter in the singlet majoron models based on neutrino, gamma-ray, and cosmic-ray telescopes in the mass region of MeV-10 TeV.
川勝康弘, JAXA
[金茶会] 火星衛星探査計画MMXと火星探査
小林ホール リモート会場：東海1号館116室 https://www-conf.kek.jp/kincha/
https://www-conf.kek.jp/kincha/
本講演では、火星探査を技術面から俯瞰すると共に、2024年度の打上げを目指し開発が進む火星衛星探査計画MMXの概要を紹介する。まず、火星探査の歴史を振り返りながら、探査方法が発展していく中で、どのように新しく高度な技術が獲得されてきたかを紹介する。そして、2020年代、火星探査の最前線においてMMXが果たす役割を押さえつつ、MMXの概要と技術を紹介する。
Diego Blas, UAB
Detecting (high frequency) gravitational waves in a box
Online (Zoom)
In the presence of a background EM field, the passage of GWs generate different modes in EM cavities by either their effect on the background field or by interacting with the boundaries of the cavity. In this talk, I will describe this process in some detail and show that these set-ups provide some of the best bounds for GWs in the MHz-GHz band. I shall finish by briefly describing the way GWs interact with spin systems.
Thanaporn Sichanugrist, University of Tokyo
Detection of hidden photon dark matter using the direct excitation of transmon qubits
Hybrid On-site: Seminar room, Kenkyu honkan 3F Online: Zoom
We propose a novel dark matter detection method utilizing the excitation of superconducting transmon qubits. Assuming the hidden photon dark matter of a mass of O(10) µeV, the classical wave-matter oscillation induces an effective ac electric field via the small kinetic mixing with the ordinary photon. This serves as a coherent drive field for a qubit when it is resonant, evolving it from the ground state towards the first-excited state. We evaluate the rate of such evolution and observable excitations in the measurements, as well as the search sensitivity to the hidden photon dark matter. For a selected mass, one can reach ɛ~10^{-13}-10^{-12} (where ɛ is the kinetic mixing parameter of the hidden photon) with a few tens of seconds using a single standard transmon qubit. A simple extension to the frequency-tunable SQUID-based transmon enables the mass scan to cover the range of 4-40 µeV (1-10 GHz) within a reasonable length of run time. The scheme has great potential to extend the sensitivity towards various directions including being incorporated into the cavity-based haloscope experiments or the currently available multi-bit Noisy Intermediate-Scale Quantum (NISQ) computer machines.
Mustafa A. Amin, Rice University
A Spin on Wave Dark Matter
Hybrid On-site: Seminar room, Kenkyu honkan 3F Online: Zoom
