Isolation Studies for Di-photon Searches

The run2 LHC will focus on searching for new particles, such as, additional Higgs particles, gravitons etc. If those particles can decay to diphoton (either at tree level or via loop), that will be the most promising channel since it provides clean signature. In order to provide the final results in a fiducial region, truth isolation equivalent to the reconstructed isolation cut need to be applied. In this study, we found that the same reco isolation cuts correspond to looser truth isolation cuts for higher invariant masses.