575 articles – 2382 Notices  [english version]
 HAL : in2p3-00725309, version 1
 arXiv : 1208.0738
 Physical Review D 86 (2012) 071102
 Measurement of the $B^0_s\rightarrow J/\psi K^{*0}$ branching fraction and angular amplitudes
 LHCb Collaboration(s)
 (2012)
 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 $f_{||} = 0.19^{+0.10}_{-0.08} \pm 0.02$.
 Thème(s) : Physique/Physique des Hautes Energies - Expérience
 Lien vers le texte intégral : http://fr.arXiv.org/abs/1208.0738
 in2p3-00725309, version 1 http://hal.in2p3.fr/in2p3-00725309 oai:hal.in2p3.fr:in2p3-00725309 Contributeur : Nicole Berger <> Soumis le : Vendredi 24 Août 2012, 16:09:05 Dernière modification le : Lundi 5 Novembre 2012, 16:07:43