| HAL : in2p3-00757461, version 1 |
| arXiv : 1211.5994 |
| DOI : 10.1103/PhysRevLett.110.151803 |
| Fiche détaillée | Récupérer au format |
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| Physical Review Letters 110 (2013) 151803 |
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| First observation of the decay $B_{s2}^*(5840)^0 \to B^{*+} K^-$ and studies of excited $B_s$ mesons |
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| LHCb Collaboration(s) |
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| (2013) |
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| 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. |
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| Thème(s) | : | Physique/Physique des Hautes Energies - Expérience |
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| Lien vers le texte intégral : |
| in2p3-00757461, version 1 | |
| http://hal.in2p3.fr/in2p3-00757461 | |
| oai:hal.in2p3.fr:in2p3-00757461 | |
| Contributeur : Danielle Cristofol | |
| Déposé pour le compte de : | |
| Soumis le : Mardi 27 Novembre 2012, 09:29:34 | |
| Dernière modification le : Mardi 16 Avril 2013, 14:26:47 | |