A5006556163- Quantum Chromodynamics and Particle Interactions
- Pulsars and Gravitational Waves Research
- High-Energy Particle Collisions Research
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- Nuclear physics research studies
- Particle physics theoretical and experimental studies
- Radioactive Decay and Measurement Techniques
- Complex Systems and Time Series Analysis
- Astrophysical Phenomena and Observations
- Advanced Statistical Methods and Models
- Atomic and Subatomic Physics Research
- Nuclear and radioactivity studies
- Black Holes and Theoretical Physics
- Gamma-ray bursts and supernovae
- Mathematical Analysis and Transform Methods
- Graphite, nuclear technology, radiation studies
- earthquake and tectonic studies
- Scientific Research and Discoveries
- Nuclear reactor physics and engineering
- Superconducting Materials and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- High-pressure geophysics and materials
Kyoto University
2022-2024
We investigate the sensitivity of $\mathrm{\ensuremath{\Lambda}}$ directed flow to potential in midcentral Au $+$ collisions at $\sqrt{{s}_{NN}}\ensuremath{\approx}3.0\text{--}30\phantom{\rule{0.16em}{0ex}}\mathrm{GeV}$. The obtained from chiral effective field theory ($\ensuremath{\chi}\mathrm{EFT}$) is used a microscopic transport model, vector version relativistic quantum molecular dynamics. find that density-dependent potentials, $\ensuremath{\chi}\mathrm{EFT}$ assuming weak momentum...
With an appropriate $YNN$ force, the $\Lambda$ single-particle potential ($\Lambda$ potential) can be made strongly repulsive at high density, and one solve hyperon puzzle of neutron stars. We investigate consistency such a potential, evaluated recently from $YN$ forces based on chiral effective field theory, with hypernuclear data heavy-ion collision data. It is found that model calculations reproduce spectroscopy directed flow in collisions. Also, we evaluate $\Sigma$ which calculated by...
We examine the $\Lambda$-${}^4\mathrm{He}$ ($\alpha$) momentum correlation in high-energy collisions to elucidate interaction between Lambdas ($\Lambda$) and nucleons ($N$). compare phenomenological $\Lambda\alpha$ potentials with different strengths at short range. In addition conventional Gaussian-type potentials, we construct by substituting nucleon density distribution $\alpha$ into Skyrme-type $\Lambda$ potentials. find that dependence on employed potential models is visible functions...
We investigate the volume and lifetime of high baryon-density matter created in heavy-ion collisions estimate optimal collision energy to realize region over a large spacetime volume. simulate central gold ions for center-of-mass per nucleon pair $\sqrt{s_{NN}}=2.4 - 19.6\;{\rm GeV}$ with microscopic transport model JAM. discover that is around $\sqrt{s_{NN}}=3 4\;{\rm GeV}$, where baryon density exceeding three times normal nuclear realized substantially Higher lower energies are disfavored...
The repulsive three-body force between the lambda ($\mathrm{\ensuremath{\Lambda}}$) hyperon and medium nucleons is a key element in solving puzzle neutron stars. We investigate binding energies of $\mathrm{\ensuremath{\Lambda}}$ hypernuclei to verify potentials from chiral effective field theory ($\ensuremath{\chi}\mathrm{EFT}$) employing Skyrme Hartree-Fock method. find that $\ensuremath{\chi}\mathrm{EFT}\phantom{\rule{4pt}{0ex}}\mathrm{\ensuremath{\Lambda}}$ potential with...
We present a Poincar\'e covariant cascade algorithm based on the constrained Hamiltonian dynamics in an $8N$-dimensional phase space to simulate Boltzmann-type two-body collision term. compare this with traditional $6N$-dimensional phase-space algorithms. To validate algorithm, we perform box calculations. examine frame dependence of one-dimensionally expanding system as well compression stages colliding two nuclei. confirm that our method is reliable high-energy nuclear collisions....
We examine the $\mathrm{\ensuremath{\Lambda}}\ensuremath{-}^{4}\mathrm{He}$ ($\ensuremath{\alpha}$) momentum correlation in high-energy collisions to elucidate interaction between Lambdas ($\mathrm{\ensuremath{\Lambda}}$) and nucleons ($N$). compare phenomenological $\mathrm{\ensuremath{\Lambda}}\ensuremath{\alpha}$ potentials with different strengths at short range. In addition conventional Gaussian-type potentials, we construct by substituting nucleon density distribution...
The mini proceedings of the "Fourth International Workshop on Extension Project for J-PARC Hadron Experimental Facility (HEF-ex 2024) [https://kds.kek.jp/event/46965]" held at J-PARC, February 19-21, 2024, are presented. workshop was devoted to discussing physics case that connects both present and future covering a wide range topics in flavor, hadron, nuclear related experimental theoretical activities being conducted facility.
We examine the $\Lambda$-${}^4\mathrm{He}$ ($\alpha$) and $\Xi \alpha$ momentum correlation in high-energy collisions to further elucidate properties of hyperon-nucleon interactions. For $\Lambda\alpha$ system, we compare potential models with different strengths at short range. find that difference among is visible from a small-size source. This indicates can constrain property $\Lambda N$ interaction range, which plays an essential role dense nuclear matter. $\Xi\alpha$ employ folding...
We study $\Xi$-$^4{\mathrm{He}}$ ($\alpha$) momentum correlation functions in the high-energy nuclear collisions to investigate nature of $\Xi N$ interactions. employ folding \alpha$ potential based on lattice QCD interactions compute function. The supports a Coulomb-assisted bound state ${}^5_{\Xi}\mathrm{H}$ $\Xi^-\alpha$ channel, while $\Xi^0\alpha$ channel is unbound. To examine sensitivity function interaction, we vary strength simulating stronger and weaker result sensitive existence...
We present a Poincar\'e covariant cascade algorithm based on the constrained Hamiltonian dynamics in an $8N$-dimensional phase space to simulate Boltzmann-type two-body collision term. compare this with traditional $6N$-dimensional phase-space algorithms. To validate algorithm, we perform box calculations. examine frame dependence of one-dimensionally expanding system as well compression stages colliding two nuclei. confirm that our method is reliable high-energy nuclear collisions....
The repulsive three-body force between the lambda ($Λ$) hyperon and medium nucleons is a key element in solving puzzle neutron stars. We investigate binding energies of $Λ$ hypernuclei to verify potentials from chiral effective field theory ($χ$EFT) employing Skyrme Hartree-Fock method. find that $χ$EFT potential with $ΛNN$ forces reproduces existing hypernuclear energy data, whereas are overestimated without force. Additionally, we search for parameter space by varying Taylor coefficients...
We investigate the sensitivity of $Λ$ directed flow to potential in mid-central Au + collisions at $\sqrt{s_{NN}}\approx3.0$--$30$ GeV. The obtained from chiral effective field theory ($χ$EFT) is used a microscopic transport model, vector version relativistic quantum molecular dynamics (RQMDv). find that density-dependent potentials, $χ$EFT assuming weak momentum dependence potential, reproduce rapidity and beam-energy measured by STAR collaboration Beam Energy Scan program. Although...
We examine the $Λ$ potential from chiral effective field theory ($χ$EFT) via directed flow heavy-ion collisions. implement obtained $χ$EFT in a vector version of relativistic quantum molecular dynamics. find that potentials assuming weak momentum dependence reproduce measured by STAR collaboration Beam Energy Scan program. While is not very sensitive to density potential, at large rapidities susceptible dependence. Thus understanding hyperons wide range beam energy and rapidity helpful...
We examine the $\Lambda$ potential from chiral effective field theory ($\chi$EFT) via directed flow heavy-ion collisions. implement obtained $\chi$EFT in a vector version of relativistic quantum molecular dynamics. find that potentials assuming weak momentum dependence reproduce measured by STAR collaboration Beam Energy Scan program. While is not very sensitive to density potential, at large rapidities susceptible dependence. Thus understanding hyperons wide range beam energy and rapidity...