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Measurement of the B_s⁰to J/psi K_S⁰ branching fraction
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arxiv 1205.0934 v4 pith:J232SYUY submitted 2012-05-04 hep-ex
Measurement of the B_s⁰to J/psi K_S⁰ branching fraction
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The $B_s^0\to J/\psi K_S^0$ branching fraction is measured in a data sample corresponding to 0.41$fb^{-1}$ of integrated luminosity collected with the LHCb detector at the LHC. This channel is sensitive to the penguin contributions affecting the sin2$\beta$ measurement from $B^0\to J/\psi K_S^0$ The time-integrated branching fraction is measured to be $BF(B_s^0\to J/\psi K_S^0)=(1.83\pm0.28)\times10^{-5}$. This is the most precise measurement to date.
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