First observation of the decay Bs2*(5840)(0)→B*+ K- and studies of excited Bs(0) mesons.

Journal article

The properties of the orbitally excited (L=1) Bs(0) states are studied by using 1.0  fb(-1) of pp collisions at sqrt[s]=7  TeV collected with the LHCb detector. The first observation of the Bs2*(5840)(0) meson decaying to B*+ K- is reported, and the corresponding branching fraction measured relative to the B+ K- decay mode. The Bs1(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 J(P)=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/c(2) is obtained.

Authors: Aaij, R; Abellan Beteta, C; Adametz, A; Adeva, B; Adinolfi, M

• Publication status: Published
• Journal: Physical Review Letters
• Volume: 110
• Issue: 15
• Pages: 151803
• Publication date: 2013-04-01
• DOI: 10.1103/physrevlett.110.151803
• EISSN: 1079-7114
• ISSN: 0031-9007
• Language: English
• Keywords: LHCb Collaboration