Measurement of the inclusive isolated-photon production cross section in pp collisions at $\sqrt{s}$ = 13 TeV

The ALICE collaboration
Eur.Phys.J.C 85 (2025) 98, 2025.

Abstract (data abstract)
The production cross section of inclusive isolated photons has been measured by the ALICE experiment at the CERN LHC in pp collisions at centre-of-momentum energy of $\sqrt{s}=13~\mathrm{TeV}$ collected during the LHC Run 2 data-taking period. The measurement is performed by combining the measurements of the electromagnetic calorimeter EMCal and the central tracking detectors ITS and TPC, covering a pseudorapidity range of $|\eta^{\gamma}|<0.67$ and a transverse momentum range of $7<p_\mathrm{T}^{\gamma}<200~$GeV/c. The result extends to lower $p_\mathrm{T}^{\gamma}$ and $x_\mathrm{T}^{\gamma} = 2p_\mathrm{T}^{\gamma}$/$\sqrt{s}$ ranges, the lowest $x_\mathrm{T}^{\gamma}$ of any isolated photon measurements to date,extending significantly those measured by the ATLAS and CMS experiments towards lower $p_\mathrm{T}^{\gamma}$ at the same collision energy with a small overlap between the measurements. The measurement is compared with next-to-leading order perturbative QCD calculations and the results from the ATLAS and CMS experiments as well as with measurements at other collision energies. The measurement and theory prediction are in agreement with each other within the experimental and theoretical uncertainties.

  • table_1

    Data from Figure 6 top pannel.

    10.17182/hepdata.155181.v1/t1

    Differential cross section of isolated photons measured in pp collisions at 13 TeV.

  • table_2

    Theory from Figure 6 top pannel.

    10.17182/hepdata.155181.v1/t2

    pQCD NLO calculations with JETPHOX of the isolated-photon cross section as a function of $p_\mathrm{T}^{\gamma}$. The calculations were obtained by...

  • table_3

    Data from Figure 8.

    10.17182/hepdata.155181.v1/t3

    Ratio of isolated-photon cross sections measured in pp collisions at $\sqrt{s}=$13 TeV over the previous ALICE measurement at $\sqrt{s}=$7 TeV.

  • table_4

    Theory from Figure 8.

    10.17182/hepdata.155181.v1/t4

    The isolated-photon cross section ratio, 13 TeV to 7 TeV, from pQCD NLO calculations with JETPHOX. The calculations were obtained...

  • table_5

    Data from Figure 9.

    10.17182/hepdata.155181.v1/t5

    Differential cross section of isolated photons as a function of $x_\mathrm{T}^{\gamma}$ measured in pp collisions at $\sqrt{s}=$13 TeV.

Loading Data...

Ask a Question


Your question will be emailed to those involved with the submission. Please mention the relevant table.


Please log in to HEPData to send a question.