Observation of X(3872) production in pp collisions at sqrt(s)= 7 TeV
LHCb Collaboration: R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi,, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander,, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves Jr, S. Amato, Y. Amhis, J., Anderson, R. B. Appleby, O. Aquines Gutierrez
TL;DR
This paper reports the first observation of X(3872) meson production in proton-proton collisions at 7 TeV, measuring its production cross-section and mass with data from the LHCb detector.
Contribution
It provides the first measurement of the inclusive production cross-section and mass of the X(3872) meson in pp collisions at 7 TeV.
Findings
Measured the production cross-section of X(3872) as 5.4 +- 1.3 (stat) +- 0.8 (syst) nb.
Reconstructed the masses of X(3872) and psi(2S) mesons in the J/psi pi+ pi- final state.
First observation of X(3872) production in pp collisions at this energy.
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-) = 5.4 +- 1.3 (stat) +- 0.8 (syst) nb, 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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