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Back, J. J.; Dossett, D.; Gershon, T. J.; Harrison, P. F.; Kreps, Michal; Latham, Thomas; Pilar, T.; Poluektov, Anton; Reid, Matthew M.; Silva Coutinho, R.; Whitehead, M. (Mark); Williams, M. P.; HASH(0x55897ead3408) (2012)
Publisher: Springer
Languages: English
Types: Article
Subjects: QC
Using 34.7 pb−1 of data collected with the LHCb\ud detector, the inclusive production of the X(3872) meson in\ud pp collisions at √s = 7 TeV is observed for the first time.\ud Candidates are selected in the X(3872)→J/ψπ+π− decay\ud mode, and used to measure σ(pp→X(3872)+anything)B(X(3872)→J/ψπ+π−) = 5.4 ±1.3 (stat)±0.8 (syst) nb, where σ(pp →X(3872) + anything) is the inclusive production cross section of X(3872) mesons with rapidity in the range 2.5–4.5 and transverse momentum in the range 5–20 GeV/c. In addition the masses of both the X(3872) and ψ(2S) mesons, reconstructed in the J/ψπ+π− final state, are measured to be mX(3872) = 3871.95± 0.48 (stat)±0.12 (syst) MeV/c2 and\ud mψ(2S) = 3686.12±0.06 (stat) ±0.10 (syst) MeV/c2.
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