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B-hadrons are an ideal tool for advancing our current understanding of theflavor sector of the Standard Model (SM). The study of B-meson production anddecays is one of the key physics themes at the Large Hadron Collider (LHC)thanks to the large production rate and the fact that B-hadrons are relativelyeasy to trigger on and identify due to their long lifetime and decays to muons.This talk presents the cross section measurement for the exclusive final stateBs->J/psi phi and an evaluation of the decay branching fraction from thepreviously published exclusive-B production cross sections. Besides probing theheavy quark properties for the first time at the LHC energy, these measurementsare also important tools for understanding and calibrating the detector, givinginput for Monte Carlo tuning, and providing results for direct comparison withother experiments.

Study of the Bs->J/psi phi decay in pp collisions at sqrt(s)=7 TeV with the CMS detector