6533b85bfe1ef96bd12bb75b
RESEARCH PRODUCT
Quenched and first unquenched lattice HQET determination of the B-s-meson width difference
V. GimenezJ. Reyessubject
PhysicsQuantum chromodynamicsNuclear and High Energy PhysicsParticle physicsMesonHigh Energy Physics - Lattice (hep-lat)Lattice (group)Order (ring theory)FOS: Physical sciencesAtomic and Molecular Physics and OpticsPartícules (Física nuclear)High Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)High Energy Physics - LatticeHeavy quark effective theorydescription
We present recent results for the prediction of the Bs lifetime difference from lattice Heavy Quark Effective Theory simulations. In order to get a next-to-leading order result we have calculated the matching between QCD and HQET and the two-loop anomalous dimensions in the HQET for all the \Delta B=2 operators, in particular for the operators which enter the width difference. We present results from quenched and, for the first time, from unquenched simulations. We obtain for the Bs lifetime difference, (\Delta\Gamma_Bs/\Gamma_Bs)^{(que.)}=(5.1+/- 1.9+/- 1.7)10^(-2) and (\Delta\Gamma_Bs/\Gamma_Bs)^{(unq.)}=(4.3+/- 2.0+/- 1.9)10^(-2) from the quenched and unquenched simulations respectively
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2001-01-01 |