Observation of X (3872) production in pp collisions at √s =7 TeV

The LHCb Collaboration

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Abstract

Using 34.7 pb 1of 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+πdecay 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+πfinal state, are measured to be mX(3872) = 3871.95 ± 0.48 (stat) ± 0.12 (syst) MeV/c2and mψ(2S) = 3686.12± 0.06 (stat) ± 0.10 (syst) MeV/c2.

Original languageEnglish
Article number1972
Number of pages9
JournalEuropean Physical Journal C
Volume72
Issue number5
DOIs
Publication statusPublished - 4 May 2012
Externally publishedYes

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