Speaker
Katsumasa NAKAYAMA
Description
We calculate the amplitude of $B \to K l^+l^-$ through the charmonium intermediate state.
It may give a significant contribution near the charmonium resonances.
Away from the resonances, one needs a reliable theoretical estimate for the search of potential new physics, and our lattice calculation provides a test of the factorization approximation, which has been used in previous phenomenological analyses.
We focus on the low $q^2$ region with a b-quark mass smaller than its physical value.
We use the Mobius domain-wall fermion for heavy and light quarks. The lattice ensemble is also generated with 2+1 flavors of Mobius domain-wall fermions at a lattice spacing 0.055 fm.
Authors
Katsumasa NAKAYAMA
Tsutomu Ishikawa
(SOKENDAI, KEK)
Shoji Hashimoto
(KEK)
