The properties of the orbitally excited (L=1) Bs0 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 Bs2*(5840)0meson 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 Bs2*(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 Bs2*(5840) 0→B* +K - decay favors the spin-parity assignment JP=2 + for the Bs2*(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/c2 is obtained.
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)