$B_s^0$-${\bar{B}}_s^0$ Oscillations as a New Tool to Explore CP Violation in $D_s^{\pm }$ Decays

Abstract

CP violation in $B_s^0$-${\bar{B}}_s^0$ oscillations is expected at the $10^{-5}$ level in the Standard Model but could be enhanced by New Physics. Using $B_s^0\to D_s^{-}{\ell }^{+}{\nu }_{\ell }$ decays, LHCb has recently reported the new result $(0.39\pm 0.33)\times 10^{-2}$ of the corresponding observable $a_{\mathrm{sl}}^s$. We point out that other current $B$ decay data imply $a_{\mathrm{sl}}^s=(0.004\pm 0.075)\times 10^{-2}$. In view of this strong constraint, we propose to use $B_s^0\to D_s^{-}{\ell }^{+}{\nu }_{\ell }$ and similar flavor-specific decays as a new tool to determine both the production asymmetry between $B_s^0$ and ${\bar{B}}_s^0$ mesons, and the CP asymmetry in the subsequent $D_s^{\pm }$ decays. The former serves as input for analyses of CP violation in $B_s^0$ channels, with significant room for improvement, while the latter offers an exciting laboratory for New Physics.

15 pages, 2 figures, improved discussion and presentation, to appear in Physics Letters B

References in corpus (15)

• Big-Bang Nucleosynthesis
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Current status of the Standard Model CKM fit and constraints on $\Delta F=2$ New Physics
• Probing New Physics through B Mixing: Status, Benchmarks and Prospects
• On the ultimate precision of meson mixing observables
• Precision Physics with B^0_s -> J/psi phi at the LHC: The Quest for New Physics
• Measurement of the CP-violating phase ${\varphi }_s$ in ${\overline{B}}_s^0\to J/\psi {\pi }^{+}{\pi }^{-}$ decays
• Topological amplitudes in $D$ decays to two pseudoscalars: a global analysis with linear $SU(3{)}_F$ breaking
• Measurement of the D+/- production asymmetry in 7 TeV pp collisions
• On new physics in $\Delta {\Gamma }_d$
• Lifetime Difference in B_s mixing: Standard Model and beyond
• Measurement of the Ds+ - Ds- production asymmetry in 7 TeV pp collisions
• Measurement of the $CP$ asymmetry in $B_s^0-\overline{B}{}_s^0$ mixing
• Standard Model updates and new physics analysis with the Unitarity Triangle fit
• Second order direct CP asymmetry in B_(s) -> X l nu

Cited by in corpus (1)

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