Study of $J/\psi$ production and cold nuclear matter effects in $pPb$ collisions at $\sqrt{s_{NN}} = 5$ TeV

The LHCb collaboration
JHEP 1402 (2014) 072, 2014

Abstract (data abstract)
CERN-LHC. The production of J/psi mesons with rapidity 1.5 < y < 4.0 or -5.0 < y < -2.5 and transverse momentum p_T < 14 GeV/c is studied with the LHCb detector in proton-lead collisions at a nucleon-nucleon centre-of-mass energy sqrt(s_NN)=5 TeV. 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.

  • Table 1

    Data from T 2, F 3

    10.17182/hepdata.64876.v1/t1

    Single differential production cross sections of prompt J/PSI mesons and of J/PSI from B decay as a function of transverse...

  • Table 2

    Data from T 2, F 3

    10.17182/hepdata.64876.v1/t2

    Single differential production cross sections of prompt J/PSI mesons and of J/PSI from B decay as a function of transverse...

  • Table 3

    Data from T 3, F 3

    10.17182/hepdata.64876.v1/t3

    Single differential production cross sections of prompt J/PSI mesons and of J/PSI from B decay as a function of rapidity...

  • Table 4

    Data from T 3, F 3

    10.17182/hepdata.64876.v1/t4

    Single differential production cross sections of prompt J/PSI mesons and of J/PSI from B decay as a function of rapidity...

  • Table 5

    Data from T 4, F 4

    10.17182/hepdata.64876.v1/t5

    Double differential production cross sections of prompt J/PSI mesons as a function of transverse momentum and rapidity in the FORWARD...

  • Table 6

    Data from T 4, F 4

    10.17182/hepdata.64876.v1/t6

    Double differential production cross sections of J/PSI mesons from B decays as a function of transverse momentum and rapidity in...

  • Table 7

    Data from T 5, F 5

    10.17182/hepdata.64876.v1/t7

    The nuclear modification factor RpPB for PT < 14 GeV/c in the BACKWARD and FORWARD regions.

  • Table 8

    Data from T 6, F 6

    10.17182/hepdata.64876.v1/t8

    The FORWARD/BACKWARD production ratio R(FB) as a function of rapidity for PT < 14 GeV/c.

  • Table 9

    Data from T 7, F 7

    10.17182/hepdata.64876.v1/t9

    The FORWARD/BACKWARD production ratioo (R(FB) as a function of PT with |yrap|=2.5-4.0.

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