CERN-LHC. Measurement of the total fiducial cross section for light-by-light scattering in lead-lead collisions at a centre-of-mass energy of 5.02 TeV with 0.48 nb^-1 of data collected in 2015. The final states used are 2 photons and no further activity in the detector.
The fiducial region is defined as:
- pt_Gamma > 3 GeV
- |eta_Gamma| < 2.4
- m_GammaGamma must be above 6 GeV
- pt_GammaGamma must be below 2 GeV
- aco_GammaGamma must be below 0.01
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