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Title:	First Observation of the Decay B∗s2(5840)0→B*+K− and Studies of Excited B0s Mesons
Author:	Abellan Beteta, Carlos; Calvo Gómez, Míriam; Camboni, Alessandro; Comerma Montells, Albert; Domingo Bonal, Francesc; Garrido Beltrán, Lluís; Grabalosa Gándara, Marc; Graciani Díaz, Ricardo; Graugés Pous, Eugeni; López Asamar, Elias; Pérez-Calero Yzquierdo, Antonio; Picatoste Olloqui, Eduardo; Pie Valls, B. (Blai); Potterat, Cédric; Rives Molina, Vicente José; Ruiz, Hugo (Ruiz Pérez); Vázquez Gómez, Ricard; Vilasis-Cardona, Xavier; LHCb Collaboration
Other authors:	Universitat de Barcelona
Abstract:	The properties of the orbitally excited ( L = 1 ) B 0 s states are studied by using 1.0     fb − 1 of p p collisions at √ s = 7     TeV collected with the LHCb detector. The first observation of the B ∗ s 2 ( 5840 ) 0 meson decaying to B * + K − is reported, and the corresponding branching fraction measured relative to the B + K − decay mode. The B s 1 ( 5830 ) 0 → B * + K − decay is observed as well. The width of the B ∗ s 2 ( 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 ∗ s 2 ( 5840 ) 0 → B * + K − decay favors the spin-parity assignment J P = 2 + for the B ∗ s 2 ( 5840 ) 0 meson. In addition, the most precise measurement of the mass difference m ( B * + ) − m ( B + ) = 45.01 ± 0.30 ( stat ) ± 0.23 ( syst )     MeV / c 2 is obtained.
Subject(s):	-Física de partícules -Experiments -Particle physics -Experiments
Rights:	cc by (c) CERN; LHCb Collaboration, 2013 http://creativecommons.org/licenses/by/3.0/es/
Document type:	Article Article - Published version
Published by:	American Physical Society
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