Amplitude analysis and branching fraction measurement of Bs-&gt;J/ψK+K-
Creators: name: LHCb Collaboration
name: Aaij, R.
name: Beteta, C. Abellan
name: Adametz, A.
name: Adeva, B.
name: Adinolfi, M.
name: Adrover, C.
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name: Gutierrez, O. Aquines
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name: Brambach, T.
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Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: An amplitude analysis of the final state structure in the Bs-&gt;J/ψK+K- decay mode is performed using 1.0/fb 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 non-resonant S-wave contribution. The largest resonant component is the ϕ(1020), accompanied by f0(980), f'2(1525), and four additional resonances. The overall branching fraction is measured to be B(Bs-&gt;J/ψK+K-)=(7.70 +/-0.08 +/- 0.39 +/- 0.60)x 10^(-4), where the first uncertainty is statistical, the second systematic, and the third due to the ratio of the number of Bs to B- mesons produced. The mass and width of the f'2(1525) are measured to be 1522.2 +/- 2.8^{+5.3}_{-2.0} MeV and 84 +/- 6^{+10}_{-5} MeV, respectively. The final state fractions of the other resonant states are also reported.
description: 37 pages 23 figures, v2 post referee comments