Abstract
The production of J/psi mesons with rapidity 1.5 <y <4.0 or 5.0 <y <2.5 and transverse momentum PT <14 GeV/e is studied with the LHCb detector in proton-lead collisions at a nucleon-nucleon centre-of-mass energy, root(NN)-N-S = 5 TeV. The J/psi mesons are reconstructed using the dimuon decay mode. The analysis is based on a data sample corresponding to an integrated luminosity of about 1.6 nb-1. For the first time the nuclear modification factor and forward-backward production ratio are determined separately for prompt J/psi mesons and J/psi from b-hadron decays. Clear suppression of prompt J/psi production with respect to proton-proton collisions at large rapidity is observed, while the production of J/psi from b-hadron decays is less suppressed. These results show good agreement with available theoretical predictions. The measurement shows that cold nuclear matter effects are important for interpretations of the related quark-gluon plasma signatures in heavy-ion collisions.
Original language | English |
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Article number | 072 |
Number of pages | 23 |
Journal | Journal of High Energy Physics |
Issue number | 2 |
DOIs | |
Publication status | Published - 18-Feb-2014 |
Keywords
- Relativistic heavy ion physics
- Quarkonium
- Heavy quark production
- Heavy Ions
- Particle and resonance production
- J-PSI
- HADRONIC PRODUCTION
- DISTRIBUTIONS
- GLUON
- SUPPRESSION
- DECAY
- TOOL