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arXiv · 0801.0143

Resolving the sign ambiguity in Delta Gamma_s with B_s -> D_s K

Soumitra Nandi·Ulrich Nierste
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Abstract

The analysis of tagged B_s -> J/psi phi decays determines the CP phase phi_s in B_s-anti-B_s mixing with a two-fold ambiguity. The solutions differ in the sign of cos(phi_s) which equals the sign of the width difference Delta Gamma_s among the two B_s mass eigenstates. We point out that this ambiguity can be removed with the help of B_s -> D_s K decays. We compare untagged and tagged strategies and find the tagged analysis more promising. The removal of the sign ambiguity in Delta Gamma_s can be done with relatively low statistics and could therefore be a target for the early stage of B_s -> D_s K studies.

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Soumitra Nandi, Ulrich Nierste. 2012-03-13. Resolving the sign ambiguity in Delta Gamma_s with B_s -> D_s K. https://doi.org/10.1103/physrevd.77.054010

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