Exploiting the width difference in Bs???

Muheim, Franz, Xie, Yuehong and Zwicky, Roman (2008) Exploiting the width difference in Bs??? Physics Letters B, 664 (3), 174-179. (doi:10.1016/j.physletb.2008.05.032).

Record type: Article

Abstract

The photon polarization in B?V? is a sensitive probe of right-handed currents. In the time dependent decay rate of Bs?phi? the coefficients S and H in front of the sin(?mst) and the sinh(??s/2t) terms are sensitive to those right-handed currents. As compared to the Bd system there is a sizable width difference in Bs mesons which leads to the additional measurable observable H. We show with a Monte Carlo simulation that the expected resolution on S and H will be about 0.15 at the LHCb experiment for ??s/?s=0.15 and a data sample of 2 fb?1. We also show that the observable H can be measured from the untagged decay rate of Bs mesons which has considerable experimental advantages as no flavour tag will be required. The resolution on H is inversely proportional to the Bs width difference ??s. These experimental prospects have to be compared with the Standard Model predictions Sphi?=0±0.002 and Hphi?=0.047±0.025+0.015 presented in this Letter. We also give the Standard Model prediction and the experimental sensitivity for the direct CP asymmetry in Bs?phi?.

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