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Inclusive photon production at forward rapidities in proton-proton collisions at $\sqrt{s}$ = 0.9, 2.76 and 7 TeV

The ALICE collaboration
Eur.Phys.J. C75 (2015) 146, 2015

Abstract (data abstract)
CERN-LHC. The multiplicity and pseudorapidity distributions of inclusive photons have been measured at forward rapidities ($2.3 < \eta < 3.9$) in proton-proton collisions at three center-of-mass energies, $\sqrt{s}=0.9$, 2.76 and 7 TeV using the ALICE detector. It is observed that the increase in the average photon multiplicity as a function of beam energy is compatible with both a logarithmic and a power-law dependence. The relative increase in average photon multiplicity produced in inelastic pp collisions at 2.76 and 7 TeV center-of-mass energies with respect to 0.9 TeV are 37.2% $\pm$ 0.3% (stat) $\pm$ 8.8% (sys) and 61.2% $\pm$ 0.3% (stat) $\pm$ 7.6% (sys), respectively. The photon multiplicity distributions for all center-of-mass energies are well described by negative binomial distributions. The multiplicity distributions are also presented in terms of KNO variables. The results are compared to model predictions, which are found in general to underestimate the data at large photon multiplicities, in particular at the highest center-of-mass energy. Limiting fragmentation behavior of photons has been explored with the data, but is not observed in the measured pseudorapidity range.

  • Table 1

    Data from Figure 6. Top

    10.17182/hepdata.69495.v1/t1

    Photon multiplicity distribution for INEL proton-proton collisions at sqrt(s)=0.9 TeV.

  • Table 2

    Data from Figure 6. Middle

    10.17182/hepdata.69495.v1/t2

    Photon multiplicity distribution for INEL proton-proton collisions at sqrt(s)=2.76 TeV.

  • Table 3

    Data from Figure 6. Bottom

    10.17182/hepdata.69495.v1/t3

    Photon multiplicity distribution for INEL proton-proton collisions at sqrt(s)=7 TeV.

  • Table 4

    Data from Figure 9. INEL p-p collisions

    10.17182/hepdata.69495.v1/t4

    Energy dependence of average photon multiplicity in INEL proton-proton collisions.

  • Table 5

    Data from Figure 9. NSD p-p collisions

    10.17182/hepdata.69495.v1/t5

    Energy dependence of average photon multiplicity in NSD proton-proton collisions.

  • Table 6

    Data from Figure 10. Top pannel

    10.17182/hepdata.69495.v1/t6

    Photon pseudorapidity distribution in INEL proton-proton collisions at sqrt(s)=0.9 TeV.

  • Table 7

    Data from Figure 10. Middle pannel

    10.17182/hepdata.69495.v1/t7

    Photon pseudorapidity distribution in INEL proton-proton collisions at sqrt(s)=2.76 TeV.

  • Table 8

    Data from Figure 10. Bottom pannel

    10.17182/hepdata.69495.v1/t8

    Photon pseudorapidity distribution in INEL proton-proton collisions at sqrt(s)=7 TeV.

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