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

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

2007-12-30

arxiv.org/abs/0801.0143v3

Phys.Rev.D77:054010,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 2 eps figures, typos in Eqs. (8) and (11) corrected

Scientific paper

10.1103/PhysRevD.77.054010

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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