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

D. Becirevic (1) , B. Blossier (1) , Ph. Boucaud (1) , J. P. Leroy (1) , A. Le Yaouanc (1) , O. Pene (1)

1 LPT - Laboratoire de Physique Théorique d'Orsay [Orsay]

We study the $B^0_s-\bar{B^0_s}$ 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 $\bar{\rm MS}$ scheme in QCD, we obtain $B^{\bar{\rm MS}}_{B_s}(m_b)=0.940(16)(22)$.

Domaines: Physique des Hautes Energies - Réseau [hep-lat]

D. Becirevic, B. Blossier, Ph. Boucaud, J. P. Leroy, A. Le Yaouanc, et al.. B_s-\bar{B_s} mixing with a chiral light quark action. Lattice 2005, Jul 2005, Ireland. pp.218. ⟨hal-00011180⟩