Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2008-02-12
Phys.Rev.D77:094509,2008
Physics
High Energy Physics
High Energy Physics - Lattice
19pages,26figures
Scientific paper
10.1103/PhysRevD.77.094509
The $B^* B\pi$ coupling is a fundamental parameter of chiral effective Lagrangian with heavy-light mesons and can constrain the chiral behavior of $f_B$, $B_B$ and the $B\to \pi l \nu$ form factor in the soft pion limit. We compute the $B^* B \pi $ coupling with the static heavy quark and the $O(a)$-improved Wilson light quark. Simulations are carried out with $n_f=2$ unquenched $12^3\times 24$ lattices at $\beta=1.80$ and $16^3\times 32$ lattices at $\beta=1.95$ generated by CP-PACS collaboration. To improve the statistical accuracy, we employ the all-to-all propagator technique and the static quark action with smeared temporal link variables following the quenched study by Negishi {\it et al.}. These methods successfully work also on unquenched lattices, and determine the $B^*B\pi$ coupling with 1--2% statistical accuracy on each lattice spacing.
Matsufuru Hideo
Ohki Hiroshi
Onogi Tetsuya
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