The European Physical Journal C

, Volume 70, Issue 4, pp 1025–1035 | Cite as

Extracting γ and penguin topologies through CP violation in \(B_{s}^{0}\to J/\psi K_{\mathrm{S}}\)

  • Kristof De Bruyn
  • Robert FleischerEmail author
  • Patrick Koppenburg
Regular Article - Theoretical Physics


The \(B_{s}^{0}\to J/\psi K_{\mathrm{S}}\) decay has recently been observed by the CDF collaboration and will be of interest for the LHCb experiment. This channel will offer a new tool to extract the angle γ of the unitarity triangle and to control doubly Cabibbo-suppressed penguin corrections to the determination of sin 2β from the well-known \(B_{d}^{0}\to J/\psi K_{\mathrm{S}}\) mode with the help of the U-spin symmetry of strong interactions. While any competitive determination of γ is interesting, the latter aspect is particularly relevant as LHCb will enter a territory of precision which makes the control of doubly Cabibbo-suppressed Standard-Model corrections mandatory. Using the data from CDF and the e + e B factories as a guideline, we explore the sensitivity for γ and the penguin parameters and point out that the \(B_{s}^{0}\)\(\bar{B}_{s}^{0}\) mixing phase φ s , which is only about −2° in the Standard Model but may be enhanced through new physics, is a key parameter for these analyses. We find that the mixing-induced CP violation \(S(B_{s}^{0}\to J/\psi K_{\mathrm{S}})\) shows an interesting correlation with sin φ s , which serves as a target region for the first measurement of this observable at LHCb.


Large Hadron Collider Monte Carlo LHCb Collaboration LHCb Experiment Penguin Parameter 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag / Società Italiana di Fisica 2010

Authors and Affiliations

  • Kristof De Bruyn
    • 1
  • Robert Fleischer
    • 1
    Email author
  • Patrick Koppenburg
    • 1
  1. 1.NikhefAmsterdamThe Netherlands

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