Kenichi Ishikawa
Hiroshima University
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Physical Review D | 2003
Sinya Aoki; R. Burkhalter; M. Fukugita; S. Hashimoto; Kenichi Ishikawa; N. Ishizuka; Y. Iwasaki; K. Kanaya; Toshihiko Kaneko; Y. Kuramashi; Masanori Okawa; Tetsuya Onogi; N. Tsutsui; A. Ukawa; N. Yamada; T. Yoshié
We present a high statistics study of the light hadron spectrum and quark masses in QCD with two flavors of dynamical quarks. Numerical simulations are carried out using the plaquette gauge action and the O(a)-improved Wilson quark action at beta=5.2, where the lattice spacing is found to be a=0.0887(11)fm from rho meson mass, on a 20^3times 48 lattice. At each of five sea quark masses corresponding to m_{PS}/m_{V} simeq 0.8-0.6, we generate 12000 trajectories using the symmetrically preconditioned Hybrid Monte Carlo algorithm. Finite spatial volume effects are investigated employing 12^3 times 48, 16^3 times 48 lattices. We also perform a set of simulations in quenched QCD with the same lattice actions at a similar lattice spacing to those for the full QCD runs. In the meson sector we find clear evidence of sea quark effects. The J parameter increases for lighter sea quark masses, and the full QCD meson masses are systematically closer to experiment than in quenched QCD. Careful finite-size studies are made to ascertain that these are not due to finite-size effects. Evidence of sea quark effects is less clear in the baryon sector due to larger finite-size effects. We also calculate light quark masses and find m_{ud}^{MS}(2GeV) =3.223(+0.046/-0.069)MeV and m_s^{MS}(2GeV)=84.5(+12.0/-1.7)MeV which are about 20% smaller than in quenched QCD.
Physical Review Letters | 2003
Sinya Aoki; M. Fukugita; S. Hashimoto; Kenichi Ishikawa; N. Ishizuka; Y. Iwasaki; K. Kanaya; Toshihiko Kaneko; Y. Kuramashi; Masanori Okawa; Tetsuya Onogi; N. Tsutsui; A. Ukawa; N. Yamada; T. Yoshié
We present an unquenched lattice calculation for the B(0)-B(0) transition amplitude. The calculation, carried out at an inverse lattice spacing 1/a=2.22(4) GeV, incorporates two flavors of dynamical quarks described by the O(a)-improved Wilson fermion action and heavy quarks described by nonrelativistic QCD. Particular attention is paid to the uncertainty that arises from the chiral extrapolation, especially the effect of pion loops, for light quarks, which we find could be sizable for the leptonic decay constant, whereas it is small for the B parameters. We obtain f(B(d))=191(10)(+12-22) MeV, f(B(s))/f(B(d))=1.13(3)(+13-2), B(B(d))(m(b))=0.836(27)(+56-62), B(B(s))/B(B(d))=1.017(16)(+56-17), and xi=1.14(3)(+13-2), where the first error is statistical, and the second is systematic, including uncertainties due to chiral extrapolation, finite lattice spacing, heavy quark expansion, and perturbative operator matching.
Physical Review D | 2006
Hidenori Fukaya; S. Hashimoto; Kenichi Ishikawa; Takashi Kaneko; Hideo Matsufuru; Tetsuya Onogi; N. Yamada
We propose a lattice action including unphysical Wilson fermions with a negative mass m{sub 0} of the order of the inverse lattice spacing. With this action, the exact zero mode of the Hermitian Wilson-Dirac operator H{sub W}(m{sub 0}) cannot appear and near-zero modes are strongly suppressed. By measuring the spectral density {rho}({lambda}{sub W}), we find a gap near {lambda}{sub W}=0 on the configurations generated with the standard and improved gauge actions. This gap provides a necessary condition for the proof of the exponential locality of the overlap-Dirac operator by Hernandez, Jansen, and Luescher. Since the number of near-zero modes is small, the numerical cost to calculate the matrix sign function of H{sub W}(m{sub 0}) is significantly reduced, and the simulation including dynamical overlap fermions becomes feasible. We also introduce a pair of twisted mass pseudofermions to cancel the unwanted higher mode effects of the Wilson fermions. The gauge coupling renormalization due to the additional fields is then minimized. The topological charge measured through the index of the overlap-Dirac operator is conserved during continuous evolutions of gauge field variables.
Physical Review Letters | 2003
Sinya Aoki; M. Fukugita; S. Hashimoto; Kenichi Ishikawa; N. Ishizuka; Y. Iwasaki; K. Kanaya; T. Kaneko; Y. Kuramashi; Masanori Okawa; Tetsuya Onogi; N. Tsutsui; A. Ukawa; Norikazu Yamada; T. Yoshié
We present an unquenched lattice calculation for the B(0)-B(0) transition amplitude. The calculation, carried out at an inverse lattice spacing 1/a=2.22(4) GeV, incorporates two flavors of dynamical quarks described by the O(a)-improved Wilson fermion action and heavy quarks described by nonrelativistic QCD. Particular attention is paid to the uncertainty that arises from the chiral extrapolation, especially the effect of pion loops, for light quarks, which we find could be sizable for the leptonic decay constant, whereas it is small for the B parameters. We obtain f(B(d))=191(10)(+12-22) MeV, f(B(s))/f(B(d))=1.13(3)(+13-2), B(B(d))(m(b))=0.836(27)(+56-62), B(B(s))/B(B(d))=1.017(16)(+56-17), and xi=1.14(3)(+13-2), where the first error is statistical, and the second is systematic, including uncertainties due to chiral extrapolation, finite lattice spacing, heavy quark expansion, and perturbative operator matching.
arXiv: High Energy Physics - Lattice | 2002
N. Yamada; Sinya Aoki; R. Burkhalter; M. Fukugita; S. Hashimoto; Kenichi Ishikawa; N. Ishizuka; Y. Iwasaki; K. Kanaya; T. Kaneko; Y. Kuramashi; M. Okawa; T Onogi; S. Tominaga; N. Tsutsui; A. Ukawa; Y Yoshie
Abstract We present a two-flavor dynamical QCD calculation of the B meson B parameters and decay constant. We use NRQCD for heavy quark and the nonperturbatively O ( a )-improved Wilson action for light quark at β = 5.2 on a 20 3 × 48 lattice. We confirm that the sea quark effect increases the heavy-light decay constant, while estimate of its magnitude depends significantly on the fitting form in the chiral extrapolation. For the B parameters, on the other hand, we do not find a significant sea quark effect. The chiral extrapolation with logarithmic term is examined for both quantities and compared with the prediction of ChPT.We present a two-flavor dynamical QCD calculation of the B meson B parameters and decay constant. We use NRQCD for heavy quark and the nonperturbatively O(a)-improved Wilson action for light quark at
Physical Review Letters | 1999
Sinya Aoki; M. Fukugita; S. Hashimoto; Kenichi Ishikawa; N. Ishizuka; Y. Iwasaki; K. Kanaya; T. Kaneda; S. Kaya; Y. Kuramashi; Masanori Okawa; Tetsuya Onogi; S. Tominaga; N. Tsutsui; A. Ukawa; N. Yamada; T. Yoshié
beta
Physical Review D | 2004
Takeshi Yamazaki; Sinya Aoki; M. Fukugita; Kenichi Ishikawa; N. Ishizuka; Y. Iwasaki; K. Kanaya; T. Kaneko; Y. Kuramashi; Masanori Okawa; A. Ukawa; T. Yoshié
=5.2 on a
Physical Review D | 2012
Takeshi Yamazaki; Kenichi Ishikawa; Y. Kuramashi; Akira Ukawa
20^3times 48
Physical Review D | 2002
Sinya Aoki; R. Burkhalter; Masataka Fukugita; S. Hashimoto; Kenichi Ishikawa; N. Ishizuka; Y. Iwasaki; K. Kanaya; T. Kaneko; Y. Kuramashi; M. Okawa; Tetsuya Onogi; S. Tominaga; N. Tsutsui; Akira Ukawa; N. Yamada; T. Yoshié
lattice. We confirm that the sea quark effect increases the heavy-light decay constant, while estimate of its magnitude depends significantly on the fitting form in the chiral extrapolation. For the B parameters, on the other hand, we do not find a significant sea quark effect. The chiral extrapolation with logarithmic term is examined for both quantities and compared with the prediction of ChPT.
arXiv: High Energy Physics - Lattice | 2002
Sinya Aoki; R. Burkhalter; M. Fukugita; S. Hashimoto; Kenichi Ishikawa; N. Ishizuka; Y. Iwasaki; K. Kanaya; T. Kaneko; Y. Kuramashi; M. Okawa; Tetsuya Onogi; S. Tominaga; N. Tsutsui; A. Ukawa; N. Yamada; T. Yoshié
We report results of quark masses in quenched lattice QCD with the Kogut-Susskind fermion action, employing the Reguralization Independent scheme (RI) of Martinelli et al. to non-perturbatively evaluate the renormalization factor relating the bare quark mass on the lattice to that in the continuum. Calculations are carried out at beta=6.0, 6.2, and 6.4, from which we find