Amplitude analysis and branching fraction measurement of B[overbar] s[superscript 0]-->J/ψK[superscript +]K[superscript -]

• Main Author: Williams, M. (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2013-11-15T17:27:18Z.
• Subjects: Article
• Online Access: Get fulltext

 An amplitude analysis of the final state structure in the B̅ s0→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 ϕ(1020), accompanied by f0(980), f2'(1525), and four additional resonances. The overall branching fraction is measured to be B(B̅ s0→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 B̅ s0 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.