| 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 sqrt(s) = 7 TeV is observed
for the first time. Candidates are selected in the X(3872) -> J/psi pi+ pi-
decay mode, and used to measure sigma(pp -> X(3872) + anything) B(X(3872)->
J/psi pi+ pi-) = 4.7 +- 1.1 (stat) +- 0.7 (syst), where sigma(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 psi(2S) mesons, reconstructed in
the J/psi pi+ pi- final state, are measured to be m(X(3872)) = 3871.95 +- 0.48
(stat) +- 0.12 (syst) MeV/c2 and m(psi(2S)) = 3686.12 +- 0.06 (stat) +- 0.10
(syst) MeV/c2 |
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