Measurement of the $B_s^0\to J/\psi K^{\ast 0}$ branching fraction and angular amplitudes

Abstract

A search for the decay $B_s^0\to J/\psi K^{\ast 0}$ with $K^{\ast 0}\to K^{-}{\pi }^{+}$ is performed with 0.37 fb${}^{-1}$ of $pp$ collisions at $\sqrt{s}$ = 7 TeV collected by the LHCb experiment, finding a $\Bs \to JψK^-π^+$ peak of $114\pm 11$ signal events. The $K^{-}{\pi }^{+}$ mass spectrum of the candidates in the $B_s^0$ peak is dominated by the $K^{\ast 0}$ contribution. Subtracting the non-resonant $K^{-}{\pi }^{+}$ component, the branching fraction of \BsJpsiKst is $(4.4_{-0.4}^{+0.5}\pm 0.8)\times 10^{-5}$, where the first uncertainty is statistical and the second systematic. A fit to the angular distribution of the decay products yields the \Kst polarization fractions $f_L=0.50\pm 0.08\pm 0.02$ and $f_{||}=0.19_{-0.08}^{+0.10}\pm 0.02$.

References in corpus (14)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• PHOTOS Monte Carlo: a precision tool for QED corrections in Z and W decays
• Branching Ratio Measurements of $B_s$ Decays
• Measurement of b hadron production fractions in 7 TeV pp collisions
• Search for the Z(4430)^- at BABAR
• Precision Physics with B^0_s -> J/psi phi at the LHC: The Quest for New Physics
• Ambiguity-Free Measurement of cos2beta: Time-Integrated and Time-Dependent Angular Analyses of B->J/Psi K pi
• Measurement of b-hadron masses
• Measurements of Branching Fractions and Decay Amplitudes in B-> J/ψK^* decays
• Observation of B0_s -> J/psi K*(892)0 and B0_s -> J/psi K0_S Decays
• Measurement of the angular and lifetime parameters of the decays $B_d^0\to J/\psi K^{\ast 0}$ and $B_s^0\to J/\psi \varphi$
• Using projections and correlations to approximate probability distributions

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• $S$-wave $K\pi$ contributions to the hadronic charmonium $B$ decays in the perturbative QCD approach
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• Observation of the decay ${\overline{B}}_s^0\to \psi (2S)K^{+}{\pi }^{-}$
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• CKM studies from b physics at hadron machines
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• Towards New Frontiers in CP Violation in B Decays