Ratios of isolated photon pp collisions cross sections $\sqrt{s}$ = 8 TeV / $\sqrt{s}$ = 7 TeV.

All cross sections $p_{\rm T}$ spectra and their ratios are shown for ALICE measurement and NLO JETPHOX calculation with NNPDOF40, NLO calculations scaled down by the partonic to hadronic isolation efficiency $\kappa^{\rm iso}$.

Different selections depending the collision energy, summary:

• pp $\sqrt{s}$ = 7 TeV: $|\eta|<0.27$ - EMCal only (Run 1, 2011, pass1); $p_{\rm T}^{\rm iso,~UE}$ < 2 GeV/$c$; Paper: https://alice-publications.web.cern.ch/node/5092
• pp $\sqrt{s}$ = 8 TeV: $|\eta|<0.52$ - EMCal only (Run 1, 2012, pass2); $p_{\rm T}^{\rm iso,~ch}$ < 1.5 GeV/$c$; Note: https://alice-notes.web.cern.ch/node/1254