A5050296295- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Physics of Superconductivity and Magnetism
- Theoretical and Computational Physics
- Superconducting Materials and Applications
- Nuclear physics research studies
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Atomic and Subatomic Physics Research
- Quantum chaos and dynamical systems
- Particle Accelerators and Free-Electron Lasers
- Complex Systems and Time Series Analysis
- Particle Detector Development and Performance
- Time Series Analysis and Forecasting
- Advanced NMR Techniques and Applications
- Data Mining Algorithms and Applications
- Radiation Detection and Scintillator Technologies
- Chemical Reactions and Isotopes
- Photocathodes and Microchannel Plates
- Temporomandibular Joint Disorders
- Amino Acid Enzymes and Metabolism
Obayashi (Japan)
2012-2024
Nagoya University
2011-2024
Osaka University
2022-2024
RIKEN Center for Computational Science
2019-2024
High Energy Accelerator Research Organization
2011-2024
Kyoto University
2022-2024
Advanced Science Research Center
2022-2024
The Graduate University for Advanced Studies, SOKENDAI
2019-2024
RIKEN Nishina Center
2022-2024
Japan Atomic Energy Agency
2022-2024
The transition temperature (Tc) of QCD is determined by Symanzik improved gauge and stout-link staggered fermionic lattice simulations. We use physical masses both for the light quarks (mud) strange quark (ms). Four sets spacings (Nt=4, 6, 8 10) were used to carry out a continuum extrapolation. It turned that only Nt=6, 10 can be controlled extrapolation, Nt=4 scaling region. Since non-singular cross-over there no unique Tc. Thus, different observables lead numerical Tc values even in...
We review lattice results related to pion, kaon, $D$-meson, $B$-meson, and nucleon physics with the aim of making them easily accessible nuclear particle communities. More specifically, we report on determination light-quark masses, form factor $f_+(0)$ arising in semileptonic $K \to \pi$ transition at zero momentum transfer, as well decay constant ratio $f_K/f_\pi$ its consequences for CKM matrix elements $V_{us}$ $V_{ud}$. Furthermore, describe obtained some low-energy constants...
Abstract We review lattice results related to pion, kaon, D -meson, B and nucleon physics with the aim of making them easily accessible nuclear particle communities. More specifically, we report on determination light-quark masses, form factor $$f_+(0)$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>f</mml:mi> <mml:mo>+</mml:mo> </mml:msub> <mml:mo>(</mml:mo> <mml:mn>0</mml:mn> <mml:mo>)</mml:mo> </mml:mrow> </mml:math> arising in semileptonic $$K...
We have simulated QCD using 2+1 flavors of domain wall quarks on a $(2.74 {\rm fm})^3$ volume with an inverse lattice scale $a^{-1} = 1.729(28)$ GeV. The up and down (light) are degenerate in our calculations we used four values for the ratio light quark masses to strange (heavy) mass simulations: 0.217, 0.350, 0.617 0.884. measured pseudoscalar meson decay constants, kaon bag parameter $B_K$ vector couplings. SU(2) chiral perturbation theory, which assumes only small, SU(3) theory...
We present physical results obtained from simulations using 2+1 flavors of domain wall quarks and the Iwasaki gauge action at two values lattice spacing $a$, ($a^{-1}$=\,1.73\,(3)\,GeV $a^{-1}$=\,2.28\,(3)\,GeV). On coarser lattice, with $24^3\times 64\times 16$ points, analysis ref.[1] is extended to approximately twice number configurations. The ensembles on finer $32^3\times are new. explain how we use data several for a range quark masses in combined continuum-chiral fits order obtain...
The authors compute the semileptonic form factors for $B\ensuremath{\rightarrow}{D}^{*}$ decay in lattice QCD with a sophisticated chiral fermion formulation. They control all systematic errors. use their result to obtain standard model prediction ratio $R({D}^{*})$ that is consistent previous results.
We extend the Rome-Southampton regularization independent momentum-subtraction renormalization scheme(RI/MOM) for bilinear operators to one with a nonexceptional, symmetric subtraction point. Two-point Green's functions insertion of quark are computed scalar, pseudoscalar, vector, axial-vector and tensor at one-loop order in perturbative QCD. call this new scheme RI/SMOM, where S stands "symmetric". Conversion factors derived, which connect RI/SMOM MSbar can be used convert results obtained...
We present the first observation of a flavor-singlet scalar meson as light pion in ${N}_{f}=8$ QCD on lattice, using highly improved staggered quark action. Such can be regarded composite Higgs with mass 125 GeV. In accord our previous lattice results showing that theory exhibits walking behavior, may technidilaton, pseudo-Nambu-Goldstone boson approximate scale symmetry technicolor.
We present an improved result for the lattice computation of proton decay matrix elements in ${N}_{f}=2+1$ QCD. In this study, by adopting error reduction technique all-mode-averaging, a significant improvement statistical accuracy is achieved relevant form factor (and also neutron) on gauge ensemble domain-wall fermions with ${m}_{\ensuremath{\pi}}=0.34--0.69\text{ }\text{ }\mathrm{GeV}$ $2.7\text{ }{\mathrm{fm}}^{3}$ lattice, as used our previous work [1]. improve total to 10--15% from...
Based on the highly improved staggered quark action, we perform lattice simulations of $N_f=8$ QCD and confirm our previous observation a flavor-singlet scalar meson (denoted as $\sigma$) light pion various "walking signals" through low-lying spectra, with higher statistics, smaller fermion masses $m_f$, larger volumes. We measure $M_\pi$, $F_\pi$, $M_\rho$, $M_{a_0}$, $M_{a_1}$, $M_{b_1}$, $M_N$, $M_\sigma$, $F_\sigma$, $\langle \bar{\psi} \psi\rangle$ (both directly GMOR relation), string...
We report our numerical lattice QCD calculations of the isovector nucleon form factors for vector and axial-vector currents: vector, induced tensor, axial-vector, pseudoscalar factors. The calculation is carried out with gauge configurations generated ${N}_{f}=2+1$ dynamical domain-wall fermions Iwasaki actions at $\ensuremath{\beta}=2.13$, corresponding to a cutoff ${a}^{\ensuremath{-}1}=1.73\text{ }\text{ }\mathrm{GeV}$, spatial volume $(2.7\text{ }\mathrm{fm}{)}^{3}$. up down-quark masses...
We present results for the nucleon axial charge ${g}_{A}$ at a fixed lattice spacing of $1/a=1.73(3)\text{ }\text{ }\mathrm{GeV}$ using $2+1$ flavors domain wall fermions on size ${16}^{3}\ifmmode\times\else\texttimes\fi{}32$ and ${24}^{3}\ifmmode\times\else\texttimes\fi{}64$ lattices ($L=1.8$ 2.7 fm) with length 16 in fifth dimension. The Monte Carlo trajectory lightest ${m}_{\ensuremath{\pi}}$ is 7360 units, including 900 thermalization. find finite volume effects are larger than pion mass...
We present a calculation of the renormalization coefficients quark bilinear operators and K-Kbar mixing parameter B_K. The relating bare lattice to those in RI/MOM scheme are computed non-perturbatively then matched perturbatively MSbar scheme. calculated on RBC/UKQCD 2+1 flavor dynamical configurations. Specifically we use 16^3 x 32 volume, Iwasaki gauge action at beta=2.13 domain wall fermions with L_s=16.
We report on numerical lattice QCD calculations of some the low moments nucleon structure functions. The are carried out with gauge configurations generated by RBC and UKQCD collaborations (2+1)-flavors dynamical domain wall fermions Iwasaki action ($\beta = 2.13$). inverse spacing is $a^{-1} 1.73$ GeV, two spatial volumes ((2.7{\rm fm})^3) ((1.8 {\rm used. up down quark masses varied so pion mass lies between 0.33 0.67 GeV while strange about 12 % heavier than physical one. function we...
On the basis of lattice simulations using highly improved staggered quarks for twelve-flavor QCD with several bare fermion masses, we observe a flavor-singlet scalar state lighter than pion in correlators fermionic interpolating operators. The same is also investigated gluonic Combined our previous study that showed to be consistent being conformal window, infer lightness due infrared conformality. This result shed some light on possibility composite Higgs boson (``technidilaton'') walking...
We determine the neutral kaon mixing matrix element ${B}_{K}$ in continuum limit with $2+1$ flavors of domain wall fermions, using Iwasaki gauge action at two different lattice spacings. These fermions have near exact chiral symmetry and therefore avoid artificial operator mixing. introduce a significant improvement to conventional nonperturbative renormalization (NPR) method which bare elements are renormalized nonperturbatively regularization invariant momentum scheme (RI-MOM) then...
We study infrared conformality of the twelve-flavor QCD on lattice. Utilizing highly improved staggered quarks (HISQ) type action which is useful to continuum physics, we analyze lattice data mass and decay constant a pseudoscalar meson vector as well at several values spacing fermion mass. Our result consistent with conformal hypothesis for anomalous dimension ${\ensuremath{\gamma}}_{m}\ensuremath{\sim}0.4--0.5$.