Exploiting the width difference in Bs→φγ

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


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The photon polarization in B→Vγ is a sensitive probe of right-handed currents. In the time dependent decay rate of Bs→phiγ the coefficients S and H in front of the sin(Δmst) and the sinh(ΔΓs/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 ΔΓs/Γs=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 ΔΓs. These experimental prospects have to be compared with the Standard Model predictions Sphiγ=0±0.002 and Hphiγ=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→phiγ.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/j.physletb.2008.05.032
ISSNs: 0556-2821 (print)
1089-4918 (electronic)
Subjects: Q Science > QC Physics
Divisions: University Structure - Pre August 2011 > School of Physics and Astronomy > Southampton High Energy Physics
ePrint ID: 145427
Date Deposited: 25 May 2010 09:33
Last Modified: 27 Mar 2014 19:06
URI: http://eprints.soton.ac.uk/id/eprint/145427

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