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Observation of X(3872) production in pp collisions at √s=7TeV
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LHCb Collaboration (Including: 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) and Williams, M. P.). (2012) Observation of X(3872) production in pp collisions at √s=7TeV. The European Physical Journal C, Vol.72 (No.5). doi:10.1140/epjc/s10052-012-1972-7 ISSN 1434-6044.
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Official URL: http://dx.doi.org/10.1140/epjc/s10052-012-1972-7
Abstract
Using 34.7 pb−1 of data collected with the LHCb
detector, the inclusive production of the X(3872) meson in
pp collisions at √s = 7 TeV is observed for the first time.
Candidates are selected in the X(3872)→J/ψπ+π− decay
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
mψ(2S) = 3686.12±0.06 (stat) ±0.10 (syst) MeV/c2.
Data sourced from Thomson Reuters' Web of Knowledge
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