An amplitude analysis of the final state structure in the B̄s0→J/ψK +K - decay mode is performed using 1.0 fb -1 of data collected by the LHCb experiment in 7 TeV center-of-mass energy pp collisions produced by the LHC. A modified Dalitz plot analysis of the final state is performed using both the invariant mass spectra and the decay angular distributions. Resonant structures are observed in the K +K - mass spectrum as well as a significant nonresonant S-wave contribution over the entire K +K - mass range. The largest resonant component is the (1020), accompanied by f 0(980), f2′(1525), and four additional resonances. The overall branching fraction is measured to be B(B̄s0→J/ψK +K -)=(7. 70±0.08±0.39±0.60)×10 -4, where the first uncertainty is statistical, the second systematic, and the third due to the ratio of the number of B̄s0 to B - mesons produced. The mass and width of the f2′(1525) are measured to be 1522.2±2.8-2.0+5.3 MeV and 84±6-5+10 MeV, respectively. The final state fractions of the other resonant states are also reported.
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|Publication status||Published - 8 Apr 2013|
Copyright 2013 Elsevier B.V., All rights reserved.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)