First observation of the decay Bs2*(5840) 0→B+K and studies of excited Bs0 mesons
- R. Aaij,
- C. Abellan Beteta,
- A. Adametz,
- B. Adeva,
- M. Adinolfi,
- C. Adrover
- National Institute for Subatomic Physics,
- Centro Brasileiro de Pesquisas Físicas,
- University of Barcelona,
- Heidelberg University,
- University of Santiago de Compostela,
- University of Bristol
Publication metrics
Metrics
Abstract
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.
Publication Information
Output type
Original language
EnglishArticle number
151803Journal (Volume, Issue Number)
Physical Review Letters (Volume 110, Issue 15)Publication milestones
- Published - 09/04/2013
Publication status
ISSN
0031-9007Publication IDs
- Scopus: 84876105247
- WOS: 000317458400009