A5074770743- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum, superfluid, helium dynamics
- Physics of Superconductivity and Magnetism
- Nuclear physics research studies
- Pulsars and Gravitational Waves Research
- High-pressure geophysics and materials
- Satellite Communication Systems
- Superconducting Materials and Applications
- Theoretical and Computational Physics
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Gamma-ray bursts and supernovae
- Precipitation Measurement and Analysis
- Telecommunications and Broadcasting Technologies
- Quantum chaos and dynamical systems
- Space Satellite Systems and Control
- Geophysics and Gravity Measurements
- Advanced Chemical Physics Studies
- Tensor decomposition and applications
- GNSS positioning and interference
- Complex Systems and Time Series Analysis
RIKEN
2016-2025
Campbell Collaboration
2009-2023
Nippon Soken (Japan)
2015-2023
RIKEN Center for Computational Science
2023
High Energy Accelerator Research Organization
1987-2022
Japan Proton Accelerator Research Complex
2022
Institute of Particle and Nuclear Studies
2022
Osaka University
2016-2022
RIKEN Nishina Center
2012-2022
Kyoto University
1984-2022
The current status of theoretical studies on the quantum chromodynamics (QCD) phase diagram at finite temperature and baryon chemical potential is reviewed with special emphasis origin various phases their symmetry breaking patterns. Topics include quark deconfinement, chiral restoration, order transitions, QCD critical point(s), colour superconductivity, inhomogeneous states implications from QCD-like theories.
A consistent treatment of quantum chromodynamical (QCD) sum rules in the nuclear medium is developed. Its close relation to structure functions nucleon deep inelastic scattering emphasized. The formalism applied spectral changes vector mesons (\ensuremath{\rho}, \ensuremath{\omega}, and \ensuremath{\varphi}) matter. linear decrease masses as a function density found. four-quark condensate 〈(q\ifmmode\bar\else\textasciimacron\fi{}q${)}^{2}$〉 twist-two...
The nucleon-nucleon ($NN$) potential is studied by lattice QCD simulations in the quenched approximation, using plaquette gauge action and Wilson quark on a ${32}^{4}$ [$\ensuremath{\simeq}(4.4\text{ }\text{ }\mathrm{fm}{)}^{4}$] lattice. A $NN$ ${V}_{NN}(r)$ defined from equal-time Bethe-Salpeter amplitude with local interpolating operator for nucleon. By studying interaction $^{1}S_{0}$ $^{3}S_{1}$ channels, we show that central part of has strong repulsive core few hundred MeV at short...
Analyzing correlation functions of charmonia at finite temperature (T) on 32(3)x(32-96) anisotropic lattices by the maximum entropy method (MEM), we find that J/psi and eta(c) survive as distinct resonances in plasma even up to T approximately 1.6T(c) they eventually dissociate between 1.9T(c) (T(c) is critical deconfinement). This suggests deconfined nonperturbative enough hold heavy-quark bound states. The importance having a sufficient number temporal data points MEM analyses also emphasized.
The flavor-singlet H dibaryon, which has strangeness -2 and baryon number 2, is studied by the approach recently developed for baryon-baryon interactions in lattice QCD. central potential derived from spatial imaginary-time dependence of Nambu-Bethe-Salpeter wave function measured N(f)=3 full QCD simulations with size L≃2,3,4 fm. found to be insensitive volume, it leads a bound dibaryon binding energy 30-40 MeV pseudoscalar meson mass 673-1015 MeV.
Imaginary-time Nambu–Bethe–Salpeter (NBS) wave function is introduced to extend our previous approach for hadron–hadron interactions on the lattice. Scattering states of hadrons with different energies encoded in NBS are utilized extract non-local potential. “The ground state saturation”, which commonly used lattice QCD but hard be achieved multi-baryons, not required. We demonstrate that present method works efficiently nucleon–nucleon interaction (the potential and phase shift) S01 channel.
A lattice QCD computation close to the physical point finds a near-threshold virtual state in $D\phantom{\rule{0}{0ex}}{D}^{*}$ scattering channel, that suggests formation of loosely bound at consistent with experimental observation doubly charmed tetraquark ${T}_{c\phantom{\rule{0}{0ex}}c}^{+}$.
Abstract This review aims at providing an extensive discussion of modern constraints relevant for dense and hot strongly interacting matter. It includes theoretical first-principle results from lattice perturbative QCD, as well chiral effective field theory results. From the experimental side, it heavy-ion collision low-energy nuclear physics results, observations neutron stars their mergers. The validity different constraints, concerning specific conditions ranges applicability, is also provided.
Fluctuations of the order parameter chiral transition in a hot and dense quark gas are examined random-phase approximation with use QCD-motivated effective Lagrangian. We show that there arise soft modes having large strength narrow width above critical temperature, which analogous to fluctuations superconductor point. It is argued contribute cooling quark-gluon plasma.
The QCD vacuum shows the dynamical breaking of chiral symmetry. In hot and/or dense medium, order parameter such as $⟨\overline{q}q⟩$ is expected to change a function temperature $T$ and density $\ensuremath{\rho}$ its experimental detection one main challenges in modern hadron physics. this paper, theoretical expectations for in-medium spectra associated with partial restoration symmetry are discussed well current status experiments an emphasis on measurements properties mesons produced...
We calculate for the first time complex potential between a heavy quark and antiquark at finite temperature across deconfinement transition in lattice QCD. The real imaginary part of each separation distance r is obtained from spectral function thermal Wilson loop. confirm existence an above critical T(C), which grows as underscores importance collisions with gluonic environment melting quarkonia quark-gluon plasma.
Using the idea of smooth crossover from hadronic matter with hyperons to quark strangeness, we show that maximum mass (Mmax) neutron stars cores can be larger than those without cores. This is in contrast conventional softening equation state due exotic components at high density. The essential conditions for reaching our conclusion are (1) takes place relatively low densities, around three times normal nuclear density and (2) strongly interacting region. From these, pressure system greater...
We study the interplay between chiral and diquark condensates within framework of Ginzburg-Landau free energy, classify possible phase structures two three-flavor massless QCD. The QCD axial anomaly acts as an external field applied to condensate in a color superconductor leads crossover broken symmetry superconducting phase, and, particular, new critical point diagram.
Charmed tetraquarks $T_{cc}=(cc\bar{u}\bar{d})$ and $T_{cs}=(cs\bar{u}\bar{d})$ are studied through the S-wave meson-meson interactions, $D$-$D$, $\bar{K}$-$D$, $D$-$D^{*}$ $\bar{K}$-$D^{*}$, on basis of (2+1)-flavor lattice QCD simulations with pion mass $m_π \simeq $410, 570 700 MeV. For charm quark, relativistic heavy quark action is employed to treat its dynamics lattice. Using HAL method, we extract potentials in simulations, from which scattering phase shifts calculated. The isospin...
The possible exotic meson $Z_{c}(3900)$, found in $e^+ e^-$ reactions, is studied by the method of coupled-channel scattering lattice QCD. interaction among $\pi J/\psi$, $\rho \eta_{c}$ and $\bar{D}D^{*}$ channels derived from (2+1)-flavor QCD simulations at $m_{\pi}=410$-$700$ MeV. dominated off-diagonal J/\psi$-$\bar{D}D^{*}$ \eta_{c}$-$\bar{D}D^{*}$ couplings, which indicates that $Z_{c}(3900)$ not a usual resonance but threshold cusp. Semi-phenomenological analyses with are presented to...
The ΩΩ system in the ^{1}S_{0} channel (the most strange dibaryon) is studied on basis of (2+1)-flavor lattice QCD simulations with a large volume (8.1 fm)^{3} and nearly physical pion mass m_{π}≃146 MeV at spacing a≃0.0846 fm. We show that data analysis by HAL method leads to scattering length a_{0}=4.6(6)(_{-0.5}^{+1.2}) fm, effective range r_{eff}=1.27(3)(_{-0.03}^{+0.06}) binding energy B_{ΩΩ}=1.6(6)(_{-0.6}^{+0.7}) MeV. These results indicate has an overall attraction located near...