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2008

Exploiting the width difference in B_s -> phi gamma

Muheim, Franz, Xie, Yuehong, Zwicky, Roman

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The photon polarization in B -> V gamma is a sensitive probe of right-handed currents.

In the time dependent decay rate of B_s -> phi gamma the coefficients S and H in front of the sin(Delta m_s t) and the sinh(Delta Gamma_s /2 t) terms are sensitive to those right-handed currents.
As compared to the B_d system there is a sizable width difference in B_s 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 Delta Gamma_s/Gamma_s = 0.15 and a data sample of 2 fb^{-1}.

Exploiting the width difference in B_s -> phi gamma · Around

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Heavy Flavour Averaging Group, updated summer 2007 http://www.slac.stanford.edu/xorg/hfag/ E. Barberio et al
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