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

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.

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

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Cited by in corpus (11)

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• Analysis of Two-body Charmed $B$ Meson Decays in Factorization-Assisted Topological-Amplitude Approach
• Measurement of the Decay B_s^0 -> D_s^- pi^+ and Evidence for B_s^0 -> D_s^{+/-} K^{-/+} in e+e- Annihilation at sqrt(s)~10.87 GeV
• Rare Decays and CP Violation in the $B_s$ System
• Exploring $B_s\to D_s^{(\ast )\pm }{K}^{\mp }$ Decays in the Presence of a Sizable Width Difference $\Delta {\Gamma }_s$
• $B_s({\bar{B}}_s)$ -> $D_{CP}^{0}K\bar{K}$: Detecting and Discriminating New Physics in $B_s$-${\bar{B}}_s$ Mixing
• $B_s\to D_{s}K$ as a Probe of CPT Violation
• Search for New Physics in the B0s mixing phase at CDF
• Bs0 Decays at Belle