@article{oai:tsukuba.repo.nii.ac.jp:00025840,
 author = {滑川, 裕介 and 青木, 愼也 and 石塚, 成人 and 金谷, 和至 and 藏増, 嘉伸 and 谷口, 裕介 and 宇川, 彰 and 吉江, 友照 and Namekawa, Y. and Aoki, S. and Ishikawa, K. -I. and Ishizuka, N. and Izubuchi, T. and Kanaya, K. and Kuramashi, Y. and Okawa, M. and Taniguchi, Y. and Ukawa, A. and Ukita, N.},
 issue = {7},
 journal = {Physical review D},
 month = {Oct},
 note = {We investigate the charm quark system using the relativistic heavy quark action on 2+1 flavor PACS-CS configurations previously generated on 323×64 lattice. The dynamical up, down, and strange quark masses are set to the physical values by using the technique of reweighting to shift the quark-hopping parameters from the values employed in the configuration generation. At the physical point, the lattice spacing equals a-1=2.194(10)??GeV and the spatial extent L=2.88(1)??fm. The charm quark mass is determined by the spin-averaged mass of the 1S charmonium state, from which we obtain mcharmMS? (μ=mcharmMS? )=1.260(1)(6)(35)??GeV, where the errors are due to our statistics, scale determination and renormalization factor. An additional systematic error from the heavy quark is of order αs2f(mQa)(aΛQCD), f(mQa)(aΛQCD)2, which are estimated to be a percent level if the factor f(mQa) analytic in mQa is of order unity. Our results for the charmed and charmed-strange meson decay constants are fD=226(6)(1)(5)??MeV, fDs=257(2)(1)(5)??MeV, again up to the heavy quark errors of order αs2f(mQa)(aΛQCD), f(mQa)(aΛQCD)2. Combined with the CLEO values for the leptonic decay widths, these values yield, Vcd, =0.205(6)(1)(5)(9),, Vcs, =1.00(1)(1)(3)(3), where the last error is because of the experimental uncertainty of the decay widths.},
 title = {Charm quark system at the physical point of 2+1 flavor lattice QCD},
 volume = {84},
 year = {2011},
 yomi = {Yoshie, T.}
}