| Thème(s) : |
 |
Physique/Physique des Hautes Energies - Expérience
|
|
| Titre : |
|
First observation of the decay $B_{s2}^*(5840)^0 \to B^{*+} K^-$ and studies of excited $B_s$ mesons |
|
| Auteur : |
|
R. Aaij, C. Adrover1, E. Aslanides1, J. Cogan1, R. Legac1, O. Leroy1, G. Mancinelli1, E. Maurice1, M. Perrin-Terrin1, M. Sapunov1, J. Serrano1, A. Tsaregorodtsev1, S. Barsuk2, O. Callot2, J. He2, B. Jean-Marie2, J. Lefrançois2, F. Machefert2, A. Martin Sanchez2, M. Nicol2, P. Robbe2, M.-H. Schune2, B. Viaud2, I. Videau2, E. Ben-Haim3, M. Benayoun3, P. David3, L. Del Buono3, A. Martens3, Z.J. Ajaltouni4, O. Deschamps4, E. Cogneras4, I. El Rifai4, P. Henrard4, M. Hoballah4, M. Jahjah Hussein4, R. Lefèvre4, L. Li Gioi4, S. Monteil4, V. Niess4, P. Perret4, D.A. Roa Romero4, K. Sobczak4, I. De Bonis5, D. Decamp5, Ph. Ghez5, P. Hopchev5, J.-P. Lees5, I.V. Machikhiliyan5, M.-N. Minard5, B. Pietrzyk5, W. Qian5, S. T'Jampens5, V. Tisserand5, E. Tournefier5 |
|
| Laboratoire : |
|
|
|
| Résumé : |
|
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. |
|
| Collaboration/Projet : |
|
LHCb |
|
|
| Type de publication : |
|
Articles dans des revues avec comité de lecture |
|
Date de publication
ou d'écriture : |
|
2013 |
|
| Nom du périodique : |
|
| Physical Review Letters (Phys. Rev. Lett.) |
| Publisher |
American Physical Society |
| ISSN |
0031-9007 (eISSN : 1079-7114) |
|
|
| Volume : |
|
110 |
|
| Page/Article : |
|
151803 |
|
|
| Identifiant local : |
|
LHCb-PAPER-2012-030; CERN-PH-EP-2012-340 |
|
| Commentaire : |
|
9 pages, 2 figures ; Submitted to Phys. Rev. Lett. ; See paper for full list of authors |
|
Récupérer au format
