M. Fukugita
University of Tokyo
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Featured researches published by M. Fukugita.
Physical Review Letters | 2000
Sinya Aoki; G. Boyd; R. Burkhalter; S. Ejiri; M. Fukugita; S Hashimoto; Y. Iwasaki; K. Kanaya; T. Kaneko; Y. Kuramashi; K. Nagai; M. Okawa; H. P. Shanahan; Akira Ukawa; T. Yoshié
We present results of a large-scale simulation for the flavor nonsinglet light hadron spectrum in quenched lattice QCD with the Wilson quark action. Hadron masses are calculated at four values of lattice spacing in the range a approximately 0.1-0.05 fm on lattices with a physical extent of 3 fm at five quark masses corresponding to m(pi)/m(rho) approximately 0.75-0.4. The calculated spectrum in the continuum limit shows a systematic deviation from experiment, though the magnitude of deviation is contained within 11%. Results for decay constants and light quark masses are also reported.
Physical Review D | 1998
M. Fukugita; Morimitsu Tanimoto; Tsutomu T. Yanagida
We propose simple phenomenological lepton mass matrices which describe the three neutrinos almost degenerate in mass, leading to a very large mixing angle between
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
\nu_\mu
Physical Review D | 2000
A. Ali Khan; Sinya Aoki; R. Burkhalter; S. Ejiri; M. Fukugita; S. Hashimoto; N. Ishizuka; Y. Iwasaki; K. Kanaya; T. Kaneko; Y. Kuramashi; T. Manke; K. Nagai; M. Okamoto; M. Okawa; Akira Ukawa; T. Yoshié
and
Physical Review D | 1999
M Okamoto; A. Ali Khan; Sinya Aoki; R. Burkhalter; S. Ejiri; M. Fukugita; S. Hashimoto; N. Ishizuka; Y. Iwasaki; K. Kanaya; T. Kaneko; Y. Kuramashi; T Manke; K. Nagai; M. Okawa; Akira Ukawa; T. Yoshié
\nu_\tau
Physical Review D | 2003
Sinya Aoki; G. Boyd; R. Burkhalter; S. Ejiri; M. Fukugita; S. Hashimoto; Y. Iwasaki; K. Kanaya; T. Kaneko; Y. Kuramashi; K. Nagai; M. Okawa; H. P. Shanahan; A. Ukawa; T. Yoshié
, as consistent with a recent report on atmospheric neutrino oscillation from the Superkamiokande collaboration. Our matrix model also gives
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
\nu_e-\nu_\mu
Physical Review D | 2000
Sinya Aoki; M. Fukugita; S. Hashimoto; K.-I. Ishikawa; N. Ishizuka; Y. Iwasaki; K. Kanaya; T. Kaneda; S. Kaya; Y. Kuramashi; M. Okawa; T. Onogi; S. Tominaga; N. Tsutsui; A. Ukawa; N. Yamada; T. Yoshié
mixing in agreement with the value required for neutrino oscillation to explain the solar neutrino problem.
Physical Review Letters | 1998
Sinya Aoki; M. Fukugita; S. Hashimoto; N. Ishizuka; Y. Iwasaki; K. Kanaya; Y. Kuramashi; M. Okawa; A. Ukawa; 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 20^3\times 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 D | 2001
A. Ali Khan; Sinya Aoki; Y. Aoki; R. Burkhalter; S. Ejiri; M. Fukugita; S Hashimoto; N. Ishizuka; Y. Iwasaki; Taku Izubuchi; K. Kanaya; T. Kaneko; Y. Kuramashi; K. Nagai; M. Okawa; H. P. Shanahan; Yusuke Taniguchi; Akira Ukawa; T. Yoshié
We study the finite-temperature phase structure and the transition temperature of QCD with two flavors of dynamical quarks on a lattice with the temporal size