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Evidence for light-by-light scattering and searches for axion-like particles in ultraperipheral PbPb collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV

The CMS collaboration
Phys.Lett. B797 (2019) 134826, 2019.

Abstract (data abstract)
Measurement of the fiducial cross section of light-by-light scattering and exclusion limits on axion-like-particles in lead-lead collisions at a centre-of-mass energy of 5.02 TeV with 390 mub^-1 of data collected in 2015. The fiducial region is defined as: - 2Gamma - pt_Gamma > 2 GeV - $|\eta_{\gamma}| < 2.4$ - exluding 1.444<|$\eta$|<1.566 region - m_GammaGamma > 5 GeV - pt_GammaGamma < 1 GeV - aco_GammaGamma < 0.01

  • Table 1

    Data from Figure 4

    10.17182/hepdata.95242.v1/t1

    Detector-level diphoton acoplanarity distribution

  • Table 2

    Data from Figure 5 top left

    10.17182/hepdata.95242.v1/t2

    Detector-level photon E$_{T}$ distribution

  • Table 3

    Data from Figure 5 top right

    10.17182/hepdata.95242.v1/t3

    Detector-level photon $\eta$ distribution

  • Table 4

    Data from Figure 5 middle left

    10.17182/hepdata.95242.v1/t4

    Detector-level photon $\phi$ distribution

  • Table 5

    Data from Figure 5 middle right

    10.17182/hepdata.95242.v1/t5

    Detector-level dipoton invariant mass distribution

  • Table 6

    Data from Figure 5 bottom left

    10.17182/hepdata.95242.v1/t6

    Detector-level diphoton rapidity distribution

  • Table 7

    Data from Figure 5 bottom right

    10.17182/hepdata.95242.v1/t7

    Detector-level dipoton p$_{T}$ distribution

  • Table 8

    Data from Figure 7 left

    10.17182/hepdata.95242.v1/t8

    Observed exclusion limits at 95% CL in the ALP-photon coupling g$_{a \gamma}$ versus ALP mass $m_{a}$ plane.

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