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Measurement of prompt $J/\psi$ pair production in pp collisions at $ \sqrt{s} $ = 7 Tev

The CMS collaboration
JHEP 1409 (2014) 094, 2014

Abstract (data abstract)
CERN-LHC. Production of prompt J/PSI meson pairs in proton-proton collisions at sqrt(s) = 7 TeV is measured with the CMS experiment at the LHC using a data sample taken during 2011 corresponding to an integrated luminosity of about 4.7 fb^{-1}. The two J/PSI mesons are fully reconstructed via their decays into MU+ MU- pairs. This observation provides for the first time access to the high-transverse-momentum region of J/PSI pair production where model predictions are not yet established. The total and differential cross sections are measured in a phase space defined by the individual J/PSI transverse momentum, PT(J/PSI), and rapidity ABS(YRAP(J/PSI)): - ABS(YRAP(J/PSI)) < 1.2 for PT(J/PSI) > 6.5 GeV; - 1.2 < ABS(YRAP(J/PSI)) < 1.43 for a PT(J/PSI) threshold that scales linearly with ABS(YRAP(J/PSI)) from 6.5 < PT(J/PSI) < 4.5 GeV; - 1.43 < ABS(YRAP(J/PSI)) < 2.2 for PT(J/PSI) > 4.5 GeV. The total cross section, assuming unpolarized prompt J/PSI pair production is 1.49 +- 0.07 (stat.) +- 0.13 (syst.) nb. Different assumptions about the J/PSI polarization imply modifications to the cross section ranging from -31% to +27%. The differential cross section is measured as a function of the J/PSI pair invariant mass, M(J/PSI J/PSI), the absolute rapidity difference between J/PSI mesons, ABS(DELTA(YRAP)), and the transverse momentum of the J/PSI pair, PT(J/PSI J/PSI).

  • Table 1

    Data from Table 2

    10.17182/hepdata.64263.v1/t1

    Differential cross section D(SIG)/DM(J/PSI J/PSI) in bins of the J/PSI pair invariant mass, M(J/PSI J/PSI).

  • Table 2

    Data from Table 3

    10.17182/hepdata.64263.v1/t2

    Differential cross section D(SIG)/DABS(DELTA(YRAP)) in bins of the absolute rapidity difference between J/PSI mesons, ABS(DELTA(YRAP)).

  • Table 3

    Data from Table 4

    10.17182/hepdata.64263.v1/t3

    Differential cross section D(SIG)/DPT(J/PSI J/PSI) in bins of the transverse momentum of the J/PSI pair, PT(J/PSI J/PSI).

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