name

Tetsuya Onogi

refid

14161

email

onogi@theo.phys.sci.hiroshima-u.ac.jp

title

Differential Decay Rate for B to pi l nu with NRQCD

collaboration

S.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.Yoshie
/JLQCD collaboration

abstract

We compute the matrix elements for B to pi l nu decay
using NRQCD heavy quark and O(a)-improved Wilson quark
with about 2000 cofigurations on a beta=5.9, 16^3x48 lattice.
We fit the matrix element near zero recoil with a polynomial function
of light quark mass m_q, inverse heavy meson mass 1/M_B
and the pion energy v\cdot k using heavy quark symmetry
and chiral symmetry and obtain the form factors for physical
B meson.
We also obtain the differential decay rate for B to pi l nu decay.

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