781 articles – 3091 references  [version française]
HAL: in2p3-00757461, version 1

Detailed view  Export this paper
Physical Review Letters 110 (2013) 151803
First observation of the decay $B_{s2}^*(5840)^0 \to B^{*+} K^-$ and studies of excited $B_s$ mesons
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
For the LHCb collaboration(s)

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.
1:  CPPM - Centre de Physique des Particules de Marseille
2:  LAL - Laboratoire de l'Accélérateur Linéaire
3:  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
4:  LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]
5:  LAPP - Laboratoire d'Annecy le Vieux de Physique des Particules
Physics/High Energy Physics - Experiment
Fulltext link: