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Measurement of the X(3872) production cross section via decays to J/psi pi pi in pp collisions at sqrt(s) = 7 TeV

The CMS collaboration
JHEP 1304 (2013) 154, 2013

Abstract (data abstract)
CERN-LHC. Study of the production of X(3872) mesons in proton-proton collisions at a centre-of-mass energy of 7 TeV using a data sample collected in 2011 with an integrated luminosity of 4.8 fb-1. The X(3872) mesons are detected through their decay to J/PSI PI+ PI- with the J/PSI decaying to two muons, and cover the X(3872) PT range from 10-50 GeV and |eta| < 1.2. The ratio of the X(3872) to PSI(2S) cross sections times their branching ratios to J/PSI PI+ PI- is presented as a function of PT, and by determining the fraction of X(3872) mesons originating from B decays, the prompt X(3872) differential cross section is extracted. In addition the di-pion mass spectrum from the X(3872) decay is measured.

  • Table 1

    Data from T 3,F 3

    10.17182/hepdata.60421.v1/t1

    Ratio between the differential X(3872) and PSI(2S) cross sections times branching fractions with (R) and without (R_fiducial) acceptance corrections.

  • Table 2

    Data from T 3

    10.17182/hepdata.60421.v1/t2

    Ratio between the total X(3872) and PSI(2S) cross sections times branching fractions with (R) and without (R_fiducial) acceptance corrections.

  • Table 3

    Data from T 6,F 5

    10.17182/hepdata.60421.v1/t3

    Nonprompt X(3872) fraction without acceptance corrections.

  • Table 4

    Data from T 6

    10.17182/hepdata.60421.v1/t4

    Total nonprompt X(3872) fraction without acceptance corrections.

  • Table 5

    Data from T 7,F 6

    10.17182/hepdata.60421.v1/t5

    Differential cross section for prompt P P --> X + anything times branching fraction X-> J/PSI pi+ pi-.

  • Table 6

    Data from P 13

    10.17182/hepdata.60421.v1/t6

    Cross section for prompt P P --> X + anything times branching fraction X-> J/PSI pi+ pi-.

  • Table 7

    Data from P 13

    10.17182/hepdata.60421.v1/t7

    Dipion invariant-mass spectrum for X(3872) ->J/PSI pi+pi- decays corrected for acceptance and efficiency, dividing by the total cross section for...

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