# Measurement of the $B^0_s\rightarrow J/\psi K^{*0}$ branching fraction and angular amplitudes

Abstract : A search for the decay $B^0_s\rightarrow J/\psi K^{*0}$ with $K^{*0} \rightarrow K^-\pi^+$ is performed with 0.37 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}$ = 7 TeV collected by the LHCb experiment, finding a $\Bs \to J\psi K^-\pi^+$ peak of $114 \pm 11$ signal events. The $K^-\pi^+$ mass spectrum of the candidates in the $B^0_s$ peak is dominated by the $K^{*0}$ 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 $f_{||} = 0.19^{+0.10}_{-0.08} \pm 0.02$.
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Journal articles

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Submitted on : Friday, August 24, 2012 - 4:09:05 PM
Last modification on : Tuesday, January 25, 2022 - 12:48:08 PM

### Citation

R. Aaij, C. Abellan Beteta, A. Adametz, B. Adeva, M. Adinolfi, et al.. Measurement of the $B^0_s\rightarrow J/\psi K^{*0}$ branching fraction and angular amplitudes. Physical Review D, American Physical Society, 2012, 86, pp.071102. ⟨10.1103/PhysRevD.86.071102⟩. ⟨in2p3-00725309⟩

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