Speaker
Yasumichi Aoki
(RIKEN BNL Research Center)
Description
The B^0--anti-B^0 mixing parameter for the B_d and B_s meson
is calculated using the domain-wall fermions (DWF) for the light quarks and
improved static fermions for the b quark on the 1/a=~1.7 GeV
n_f=2+1 Iwasaki-DWF ensembles. The static approximation
has the sizable Lambda/m_h leading systematic error.
The systematic error for the SU(3)_f breaking ratio, however,
is suppressed by another factor of (m_d-m_s)/Lambda, thus
is 2% with a naive estimate. The results will eventually be combined
with those on a finer lattice to have continuum extrapolation,
where the use of two different smearings in the static quark action and
the O(g^2 a) improvement of the operators will provide various cross checks.
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Primary author
Yasumichi Aoki
(RIKEN BNL Research Center)
