First observation of the decay $B_{s2}^*(5840)^0 \to B^{*+} K^-$ and studies of excited $B_s$ mesons

Abstract : Properties of the orbitally excited (L=1) $B_s$ states are studied using 1.0 fb$^{-1}$ of pp collisions at $\sqrt{s} =7$ TeV collected with the LHCb detector. The first observation of the $B_{s2}^*(5840)^0$ meson decaying to $B^{*+} K^- is reported, and the corresponding branching fraction measured relative to the $B^+ K^-$ decay mode. The $B_{s1}(5830)^0 \to B^{*+} K^-$ decay is observed as well. The width of the $B_{s2}^*(5840)^0$ state is measured for the first time and the masses of the two states are determined with the highest precision to date. The observation of the $B_{s2}^*(5840)^0 \to B^{*+} K^-$ decay favours the spin-parity assignment $J^P = 2^+$ for the $B_{s2}^*(5840)^0$ meson. In addition, the most precise measurement of the mass difference $m(B^{*+})-m(B^+) = 45.01 \pm 0.30 (stat) \pm 0.23 (syst)$ MeV/$c^2$ is obtained.
Type de document :
Article dans une revue
Physical Review Letters, American Physical Society, 2013, 110, pp.151803. <10.1103/PhysRevLett.110.151803>


http://hal.in2p3.fr/in2p3-00757461
Contributeur : Danielle Cristofol <>
Soumis le : mardi 27 novembre 2012 - 09:29:34
Dernière modification le : mardi 11 octobre 2016 - 13:41:30

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R. Aaij, C. Adrover, E. Aslanides, J. Cogan, R. Legac, et al.. First observation of the decay $B_{s2}^*(5840)^0 \to B^{*+} K^-$ and studies of excited $B_s$ mesons. Physical Review Letters, American Physical Society, 2013, 110, pp.151803. <10.1103/PhysRevLett.110.151803>. <in2p3-00757461>

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