A5101334150- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Distributed and Parallel Computing Systems
- Particle Accelerators and Free-Electron Lasers
- International Science and Diplomacy
- Neutrino Physics Research
- Computational Physics and Python Applications
- Radiation Detection and Scintillator Technologies
- Quantum Chromodynamics and Particle Interactions
- Educational Robotics and Engineering
- Plasma Diagnostics and Applications
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Aerodynamics and Acoustics in Jet Flows
- Metallurgy and Material Science
- Laser-Plasma Interactions and Diagnostics
- Precipitation Measurement and Analysis
- Flow Measurement and Analysis
- Atomic and Subatomic Physics Research
The University of Tokyo
2016-2024
High Energy Accelerator Research Organization
2016-2017
Institute of Particle Physics
2017
The Graduate University for Advanced Studies, SOKENDAI
2017
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.
Future ${e}^{+}{e}^{\ensuremath{-}}$ colliders give the promise of model-independent determinations couplings Higgs boson. In this paper, we present an improved formalism for extracting boson from data, based on effective field theory description corrections to Standard Model. We apply projections coupling accuracies stages International Linear Collider and other proposed colliders.
The observation of Higgs pair production at high-energy colliders can give evidence for the presence a triple coupling. However, actual determination value this coupling is more difficult. In context general models new physics, double processes receive contributions from many possible beyond-Standard-Model effects. This dependence must be understood if one to make definite statement about deviation field potential Standard Model. paper, we study extraction process...
The International Linear Collider is now proposed with a staged machine design, the first stage at $\sqrt{s}=$~250 GeV and an integrated luminosity goal of 2~ab$^{-1}$. One questions for design importance positron polarization. In this report, we review impact polarization on physics goals $250$ ILC demonstrate that has distinct advantages.
This document provides detailed information on the status of Advanced and Novel Accelerators techniques describes steps that need to be envisaged for their implementation in future accelerators, particular high energy physics applications. It complements overview prepared update European Strategy particle physics, a description field. The scientific priorities community are described each technique acceleration able achieve accelerating gradient GeV~range or above. ALEGRO working group...
This document is the final report by Committee on Scientific Case of ILC Operating at 250 GeV as a Higgs Factory. committee was commissioned Japan Association High Energy Physicists. The purpose this to investigate and compare capability determine energy scale new phenomena principles uncover origin matter-antimatter asymmetry.
This article is based on the talk presented at International Workshop Future Linear Colliders (LCWS13) which held during November 11-15, 2013 Tokyo, Japan. We present several analyses related to Higgs total width study ILC full detector simulation of ILD, are \eevvH followed by \Htobb and \HtoWW. The studies show that $\unit{250}{GeV}$ we can determine with a relative precision 11% $HWW$ coupling 4.8%, whereas $\unit{500}{GeV}$ expected be significantly improved 5% 1.2% respectively,...
In the Standard Model (SM) couplings of Higgs boson to SM particles and itself (selfcouplings) are uniquely specified once masses in question as well mass given. Precision measurements these future collider experiments key either verifying mechanism electroweak symmetry breaking or uncovering physics beyond SM. This article gives an overview how various will be measured at ILC. Emphasis is put on ILC’s capability performing fully model independent determination absolute HZZ HWW couplings,...
The determination of the Higgs self-coupling is a key target for future colliders, in particular through di-Higgs production at $e^+e^-$ Linear Colliders with $\sqrt{s} > 450$ GeV, e.g. ILC, C3 or CLIC. This contribution will discuss roles and interplay processes various collider energies, including case non-SM values self-coupling. Previous studies, already based on Geant4-based detector simulation, established that can be extracted $10-27\%$ precision provided solid understanding limiting...
Precision measurement of Higgs boson couplings will be the central task high energy physics in next decades, as key to unknown. This article gives an overview how various measured at International Linear Collider (ILC). Emphases are placed on ILC's capability performing fully model independent determination absolute HZZ and HWW couplings, total width, hence other such Hbb Hcc, which cover essentially all crucial ones including top-Yukawa coupling Htt self-coupling λHHH. The strategy get best...
In this Analysis we investigated the possibility of measurement Higgs self-coupling at ILC through process $e^++e^-\rightarrow ZHH$ using fast simulation data. So far two combinations decay modes: $Z\rightarrow q \bar q,H\rightarrow b\bar b, H\rightarrow WW^*$ and l l, b$ were studied. Our preliminary results show that it is very challenging to suppress huge standard model backgrounds effectively.
To aid contributions to the Snowmass 2021 US Community Study on physics at International Linear Collider and other proposed $e^+e^-$ colliders, we present a list of study questions that could be basis useful projects. We accompany this with links references resources physics, description new software framework are preparing for studies Snowmass.
If the gamma-gamma resonance at 750 GeV suggested by 2015 LHC data turns out to be a real effect, what are implications for physics case and upgrade path of International Linear Collider? Whether or not is confirmed, this question provides an interesting study testing robustness ILC case. In note, we address with two points: (1) Almost all models proposed new particle require additional particles electroweak couplings. The key elements 500 program---precision measurements Higgs boson, top...
For the International Large Detector concept at planned Linear Collider, use of time projection chambers (TPC) with micro-pattern gas detector readout as main tracking is investigated. In this paper, results from a prototype TPC, placed in 1 T solenoidal field and read out three independent GEM-based modules, are reported. The TPC was exposed to 6 GeV electron beam DESY II synchrotron. efficiency for reconstructing hits, measurement drift velocity, space point resolution control...
This presentation gives the prospects of measuring general Lorentz structures $VVH$ ($V=Z$, $\gamma$ and $W$) couplings at International Linear Collider (ILC). Sensitivities to Higgs CP-even CP-odd are evaluated by using various production channels employing measurements kinematical distributions. The evaluation is performed based on full detector simulation Large Detector (ILD) center-of-mass energies $\sqrt{s}=$ 250 500 GeV. Combined sensitivities anomalous $ZZH$ provided for a realistic...
This paper presents a combined analysis of the potential future electron-positron collider to constrain Higgs, top and electro-weak (EW) sectors Standard Model Effective Field Theory (SMEFT). The leading contributions operators involving quarks arise mostly at one-loop suppressed order can be captured by renormalization group mixing with Higgs operators. We perform global fits an extended basis 29 parameters, including both operators, projections for precision measurements International...
In the Standard Model (SM) couplings of Higgs boson to SM particles and itself (self-couplings) are uniquely specified once masses in question as well mass given. Precision measurements these future collider experiments key either verifying mechanism electroweak symmetry breaking or uncovering physics beyond SM. This article gives an overview how various will be measured at ILC. Emphasis is put on ILC's capability performing fully model independent determination absolute $HZZ$ $HWW$...
This paper presents a combined analysis of the potential future electron-positron collider to constrain Higgs, top, and electroweak sectors Standard Model effective field theory. The leading contributions operators involving top quarks arise mostly at one-loop suppressed order can be captured by renormalization group mixing with Higgs operators. We perform global fits an extended basis 29 parameters, including both operators, projections for precision measurements International Linear...
Electroweak Precision Measurements are stringent tests of the Standard Model and sensitive probes to New Physics. Accurate studies Z-boson couplings first-generation quarks could reveal potential discrepancies between fundamental theory experimental data. Future lepton colliders offering high statistics Z bosons would be an excellent tool perform such a measurement based on comparison radiative non-radiative hadronic decays boson. Due difference in quark charge, relative contribution events...
In this study we investigate the feasibility of detecting heavy neutral leptons (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msub><a:mrow><a:mi>N</a:mi></a:mrow><a:mrow><a:mi>d</a:mi></a:mrow></a:msub></a:mrow></a:math>) through exotic Higgs decays at proposed International Linear Collider (ILC), specifically in channel <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...
The determination of the Higgs self-coupling is a key target for future colliders, in particular through di-Higgs production at $e^+e^-$ Linear Colliders with $\sqrt{s} > 450$\,GeV, e.g.\ ILC, C3 or CLIC. This contribution will discuss roles and interplay processes various collider energies, including case non-SM values self-coupling. Previous studies, already based on Geant4-based detector simulation, established that can be extracted $10-27\%$ precision provided solid understanding...