A5069406937- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Black Holes and Theoretical Physics
- Computational Physics and Python Applications
- Particle Accelerators and Free-Electron Lasers
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- International Science and Diplomacy
- Distributed and Parallel Computing Systems
- Superconducting Materials and Applications
- Computer Graphics and Visualization Techniques
- Nuclear Physics and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Atomic and Subatomic Physics Research
- Fractal and DNA sequence analysis
- Relativity and Gravitational Theory
- Scientific Research and Discoveries
- Aerodynamics and Acoustics in Jet Flows
- Quantum, superfluid, helium dynamics
- Physics of Superconductivity and Magnetism
- Experimental and Theoretical Physics Studies
The University of Tokyo
2010-2025
High Energy Accelerator Research Organization
2015-2025
The Graduate University for Advanced Studies, SOKENDAI
2012-2025
Kavli Institute for the Physics and Mathematics of the Universe
2010-2025
Institute of Particle and Nuclear Studies
2007
Kyoto University
1988-2006
Yukawa Institute for Theoretical Physics
2004
University of Wisconsin–Madison
1993-1994
Mitsubishi Electric (Japan)
1993
We compute the cosmic relic (dark-matter) density of lightest supersymmetric particle (LSP) in framework minimal $N=1$ supergravity models with radiative breaking electroweak gauge symmetry. To this end, we recalculate cross sections for all possible annihilation processes a general, mixed neutralino state arbitrary mass. Our analysis includes effects Yukawa couplings third-generation fermions, and allows fairly general set soft supersymmetry- (SUSY-) parameters at Planck scale. find that...
Detection of gamma rays from dark matter annihilation in the galactic center is one feasible techniques to search for matter. We evaluate gamma-ray flux case that has an electroweak $\mathrm{S}\mathrm{U}(2{)}_{L}$ charge. Such realized minimal supersymmetric standard model (MSSM) when lightest SUSY particle Higgsino- or Wino-like neutralino. When heavy compared weak gauge bosons, leading-order calculation cross sections perturbation breaks down due a threshold singularity. take into account...
This document proposes a collection of simplified models relevant to the design new-physics searches at LHC and characterization their results. Both ATLAS CMS have already presented some results in terms models, we encourage them continue expand this effort, which supplements both signature-based benchmark model interpretations. A is defined by an effective Lagrangian describing interactions small number new particles. Simplified can equally well be described masses cross-sections. These...
In this Letter we study pair annihilation processes of dark matter (DM) in the Universe, case that DM is an electroweak gauge nonsinglet. current which highly nonrelativistic, nonperturbative effect may enhance cross sections, especially for to two photons, by several orders magnitude. We also discuss sensitivities future searches anomalous gamma rays from galactic center, originate annihilation.
We present a detailed discussion of the elastic scattering supersymmetric neutralino off nucleon or nucleus, with emphasis on spin-independent interaction. carefully treat QCD effects squark exchange contribution. In particular, we identify class terms that survive even in absence mixing both and sectors; corresponding quark gluon operators also appear analyses deep-inelastic lepton-nucleon ("twist-2 operators"), so their hadronic matrix elements are well known. reemphasize importance...
The International Linear Collider is now proposed with a staged machine design, the first stage at 250 GeV luminosity goal of 2 ab-1. In this paper, we review physics expectations for machine. These include precision measurements Higgs boson couplings, searches exotic decays, other particles that decay zero or small visible energy, and e+e- annihilation to W+W- 2-fermion states improved sensitivity. A summary table gives projections achievable levels based on latest full simulation studies.
We summarize the physics case for International Linear Collider (ILC). review key motivations ILC presented in literature, updating projected measurement uncertainties experiments accord with expected schedule of operation accelerator and results most recent simulation studies.
The International Linear Collider (ILC) is on the table now as a new global energy-frontier accelerator laboratory taking data in 2030s. ILC addresses key questions for our current understanding of particle physics. It based proven technology. Its experiments will challenge Standard Model physics and provide window to look beyond it. This document brings story up date, emphasizing its strong motivation, readiness construction, opportunity it presents US community.
A bstract We deploy an advanced Machine Learning (ML) environment, leveraging a multi-scale cross-attention encoder for event classification, towards the identification of gg → H hh $$ b\overline{b}b\overline{b} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>b</mml:mi> <mml:mover> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> process at High Luminosity Large Hadron Collider (HL-LHC), where h is discovered Standard Model (SM)-like Higgs boson and heavier version it (with m...
We reinvestigate the question of whether a light Higgsino-like neutralino is viable dark matter candidate. To this end we compute dominant one-loop corrections to masses states in minimal supersymmetric standard model (MSSM), due loops involving heavy quarks and their superpartners. also calculate analogous couplings neutralinos $Z$ Higgs bosons. In region parameter space leading high Higgsino purity lightest neutralino, these can change expected relic density by up factor 5 either...
The neutralino pair annihilation into two photons in our galactic halo gives a robust dark matter signal, since it would give quasi-monotonic gamma ray. This process is radiatively-induced, and the full-one loop calculation was done previously. However, for heavy wino-like or Higgsino-like neutralino, one-loop cross section violates unitarity, therefore higher-order corrections may be important. We construct non-relativistic theory chargino two-body states, estimate all-order QED two-loop by...
We study the Higgs spectrum of minimal supersymmetric standard model in context supergravity models with radiative gauge-symmetry breaking, including leading one-loop corrections. find that, unlike more general scenarios, these corrections cannot change ordering Higgsboson masses as predicted by tree-level expressions. Moreover, upper bound on mass lightest boson is reduced compared to case; however, even most restrictive sector might escape detection at CERN Large Electron-Positron Collider...
In models where the gravitino is lightest supersymmetric particle, next-to-lightest particle (NLSP) long-lived. We consider an important charged NLSP candidate, scalar tau $\stackrel{\texttildelow{}}{\ensuremath{\tau}}$. Slow NLSPs may be produced at future colliders and they stopped in a massive stopper which simultaneously serves as detector for its decay products. found number of events 1 kton to $\mathrm{O}(10) \mathrm{k}\mathrm{t}\mathrm{o}\mathrm{n}$ could significant enough study...
In this paper, we consider phenomenology of a model with an $L_\mu-L_\tau$ gauge symmetry. Since the muon couples to boson (called $Z''$ boson), its contribution anomalous magnetic moment (muon g-2) can account for discrepancy between standard prediction and experimental measurements. On other hand, does not interact electron quarks, hence there are no strong constraints from collider experiments even if mass is order electroweak scale. We show allowed region parameter space in symmetric...
We present an overview of the capabilities that International Linear Collider (ILC) offers for precision measurements probe Standard Model. First, we discuss improvements ILC will make in electroweak observables, both from W boson production and radiative return to Z at 250 GeV center mass a dedicated GigaZ stage running pole. then new results on fermion pair production, including b t quarks. update projections determination Higgs couplings through Model Effective Field Theory fit taking...
A bstract Attention-based transformer models have become increasingly prevalent in collider analysis, offering enhanced performance for tasks such as jet tagging. However, they are computationally intensive and require substantial data training. In this paper, we introduce a new classification network using an MLP mixer, where two subsequent operations serve to transform particle feature tokens over the constituents. The transformed particles combined with subjet information multi-head...
We propose a new mass reconstruction technique for SUSY processes at the LHC. The idea is to completely solve kinematics of cascade decay by using assumption that selected events satisfy same shell conditions sparticles involved in decay. Using this technique, we study measurement bottom squarks gluino. Based on final state including two high ${p}_{T}$ leptons and $b$-jets, investigate different possible approaches gluino squarks. In particular, evaluate performance algorithms discriminating...
We discuss coherent scattering between supersymmetric neutralinos and nuclei via an effective neutralino-gluon interaction. identify two new classes of diagrams which are not treated in the existing literature. These occur at same order perturbation theory as previously considered diagrams. The contributions can be numerically important, even dominate total amplitude. This affects clculation fo event rates experiments searching for direct or indirect evidence cosmic relic neutralinos.
We study the littlest Higgs model with $T$ parity at CERN LHC through pair productions of $T$-odd top quark partner (${T}_{\ensuremath{-}}$) which decays into and lightest particle. identify region parameters favored by electroweak cosmological considerations. The signal background events are simulated fast detector simulation to discovery potential LHC. find that hemisphere analysis recently proposed CMS Collaboration is very useful separate from $t\overline{t}$ background. discuss...
Deep neural networks trained on jet images have been successful in classifying different kinds of jets. In this paper, we identify the crucial physics features that could reproduce classification performance convolutional network top vs. QCD classification. We design a considers two types substructural features: two-point energy correlations, and IRC unsafe counting variables morphological analysis images. The new set can be described by Minkowski functionals from integral geometry. To...