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The B_s^0 -> J/psi K_S decay has recently been observed by the CDFcollaboration and will be of interest for the LHCb experiment. This channelwill offer a new tool to extract the angle gamma of the unitarity triangle andto control doubly Cabibbo-suppressed penguin corrections to the determinationof sin(2beta) from the well-known B_d^0 -> J/psi K_S mode with the help of theU-spin symmetry of strong interactions. While any competitive determination ofgamma is interesting, the latter aspect is particularly relevant as LHCb willenter a territory of precision which makes the control of doublyCabibbo-suppressed Standard-Model corrections mandatory. Using the data fromCDF and the e^+e^- B factories as a guideline, we explore the sensitivity forgamma and the penguin parameters and point out that the B_s^0-\bar B_s^0 mixingphase phi_s, which is only about -2 deg in the Standard Model but may beenhanced through new physics, is a key parameter for these analyses. We findthat the mixing-induced CP violation S(B_s^0 -> J/psi K_S) shows an interestingcorrelation with sin(phi_s), which serves as a target region for the firstmeasurement of this observable at LHCb.

Extracting gamma and Penguin Topologies through CP Violation in B_s^0 -> J/psi K_S