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Measurement of Bose-Einstein Correlations in $pp$ Collisions at $\sqrt{s}=0.9$ and 7 TeV

The CMS collaboration
JHEP 1105 (2011) 029, 2011

Abstract (data abstract)
CERN-LHC. Measurments of the Bose-Einstein correlations (BEC) between pairs of identical particles produced in proton-proton collisions at centre-of-mass energies of 0.9 and 7 TeV. The data used are minimum-bias events (4.2M at 0.9 TeV and 2.7M at 7 TeV) with charged particles required to have |eta| < 2.4 and PT > 200MeV. The following is a definition of the quantity measured: R_double is defined as ratio between (DN/DQ)/(DNref/DQ) and the equivalent quantity from simulated Monte Carlo events (without BEC effects), where N is the number of 'real' events and Nref the number 'reference' events derived from combining identical particles from different events with similar charged particle multiplicites and in similar pseudorapidity regions. Q is the Lorentz-invariant quantity equal to the square-root of the negative squared difference in four momentum of the two identical particles. Assuming the particles to be predominantly pions, this is equal to the square-root of the difference in the squared invariant mass of the two particles and 4*the pion mass squared. The data shows an enhancement of the number of pairs of same-sign charged particles with small relative momentum, the dependence of which is studied on kinematic and topological features.

  • Table 1

    Data from F 1

    10.17182/hepdata.60018.v1/t1

    The double ratio R_double at 900 and 7000 GeV.

  • Table 2

    Data from F 2

    10.17182/hepdata.60018.v1/t2

    The double ratio R_double at 7000 GeV in different bins of charged particle multiplicity and kT.

  • Table 3

    Data from F 2

    10.17182/hepdata.60018.v1/t3

    The double ratio R_double at 7000 GeV in different bins of charged particle multiplicity and kT.

  • Table 4

    Data from F 2

    10.17182/hepdata.60018.v1/t4

    The double ratio R_double at 7000 GeV in different bins of charged particle multiplicity and kT.

  • Table 5

    Data from F 6

    10.17182/hepdata.60018.v1/t5

    The double ratio R_double at 7000 GeV in different bins of charged particle multiplicity.

  • Table 6

    Data from T 3

    10.17182/hepdata.60018.v1/t6

    Parameters of the fit to the double ratio R_double at 900 GeV.

  • Table 7

    Data from T 3

    10.17182/hepdata.60018.v1/t7

    Parameters of the fit to the double ratio R_double at 7000 GeV.

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