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First observation of the decay B*s2(5840)º →B*+K- and studies of excited Bºs
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LHCb Collaboration (Including: Back, J. J., Craik, Daniel, Dossett, D., Gershon, T. J., Harrison, P. F., Kreps, Michal, Latham, Thomas, Reid, Matthew M., Silva Coutinho, R., Pilar, T., Poluektov, Anton, Whitehead, M. (Mark) and Williams, M. P.). (2013) First observation of the decay B*s2(5840)º →B*+K- and studies of excited Bºs. Physical Review Letters, Volume 110 (Number 15). Article number 151803. doi:10.1103/PhysRevLett.110.151803 ISSN 0031-9007.
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Official URL: http://dx.doi.org/10.1103/PhysRevLett.110.151803
Abstract
The properties of the orbitally excited (L=1) Bºs states are studied by 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)º meson decaying to B*+K- is reported, and the corresponding branching fraction measured relative to the B+K- decay mode. The Bs1(5830)º →B*+K- decay is observed as well. The width of the B*s2(5840)º 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)º →B*+K- decay favors the spin-parity assignment JP=2+ for the B*s2(5840)º meson. In addition, the most precise measurement of the mass difference m(B*+)-m(B+)=45.01±0.30(stat)±0.23(syst) MeV/c2 is obtained.
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