Measurement of J/psi production in pp collisions at sqrt(s)=2.76 TeV
LHCb collaboration: R. Aaij, C. Abellan Beteta, A. Adametz, B. Adeva,, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio,, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves Jr, S., Amato, Y. Amhis, L. Anderlini, J. Anderson
TL;DR
This paper reports the measurement of J/psi meson production cross-sections in proton-proton collisions at 2.76 TeV using the LHCb detector, providing key data for understanding quarkonium production mechanisms.
Contribution
It presents the first measurement of inclusive J/psi production cross-section and the fraction from b-hadron decays at this energy in the specified kinematic region.
Findings
Inclusive J/psi cross-section: 5.6 +/- 0.1(stat) +/- 0.4(syst) mub
Fraction from b-hadron decays: 7.1 +/- 0.6(stat) +/- 0.7(syst) %
Differential cross-section as a function of pT
Abstract
The production of J/psi mesons is studied with the LHCb detector using data from pp collisions at sqrt(s)=2.76 TeV corresponding to an integrated luminosity of 71 nb^-1. The differential cross-section for inclusive J/psi production is measured as a function of its transverse momentum pT. The cross-section in the fiducial region 0<pT<12 GeV/c and rapidity 2.0<y<4.5 is measured to be 5.6 +/- 0.1(stat) +/- 0.4 (syst) mub, with the assumption of unpolarised J/psi production. The fraction of J/psi production from b-hadron decays is measured to be (7.1 +/- 0.6 (stat) +/- 0.7 (syst)) %.
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