B meson B-parameters and the decay constant in two-flavor dynamical QCD

JLQCD Collaboration

Yamada N

Aoki S

Burkhalter R

Fukugita M

Hashimoto S

Ishikawa Kenichi

Ishizuka N

Iwasaki Y

Kanaya K

Kaneko T

Kuramashi Y

Okawa Masanori

Onogi T

Tominaga S

Tsutsui N

Ukawa A

Yoshie Y

Nuclear Physics B - Proceedings Supplements

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 203 × 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.

QCD calculation

NRQCD

B meson

B-parameters

物理学 [ 420 ]

英語

Elsevier Science B.V.

Copyright (c) 2002 Elsevier Science B.V.

[ISSN] 0920-5632

[DOI] 10.1016/S0920-5632(01)01726-1

[DOI] http://dx.doi.org/10.1016/S0920-5632(01)01726-1 ～の異版である