First observation of the decay B_s2^*(5840)^0 → B^*+ K^- and studies of excited B_s mesons release_hw5rasz25rer3cnzcabcfj6o4m

by LHCb collaboration: R. Aaij, C. Abellan Beteta, A. Adametz, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle (+586 others)

Released as a report .

2012  

Abstract

Properties of the orbitally excited (L=1) B_s states are studied using 1.0 fb^-1 of pp collisions at √(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 → 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 → 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 ± 0.30 (stat) ± 0.23 (syst) MeV/c^2 is obtained.
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Type  report
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Date   2012-11-26
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Number  LHCb-PAPER-2012-030; CERN-PH-EP-2012-340
arXiv  1211.5994v1
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