B_s-\bar{B_s} mixing with a chiral light quark action

Abstract

We study the $B_s^0-\overline{B_s^0}$ mixing amplitude in Standard Model by computing the relevant hadronic matrix element in the static limit of lattice HQET with the Neuberger light quark action. In the quenched approximation, and after matching to the $\overline{\mathrm{MS}}$ scheme in QCD, we obtain $B_{B_s}^{\overline{\mathrm{MS}}}(m_b)=0.940(16)(22)$.

Comments: 6 pages, 3 figures, talk presented at Lattice 2005 (Heavy quark physics)