Searches for new resonances in the diphoton final state, with spin 0 as predicted by theories with an extended Higgs sector and with spin 2 using a warped extra-dimension benchmark model, are presented using 139 fb−1 of s=13 TeV pp collision data collected by the ATLAS experiment at the LHC. No significant deviation from the Standard Model is observed and upper limits are placed on the production cross-section times branching ratio to two photons as a function of the resonance mass.

Aad, G., Abbott, B., Abbott, D.C., Abed Abud, A., Abeling, K., Abhayasinghe, D.K., et al. (2021). Search for resonances decaying into photon pairs in 139 fb−1 of pp collisions at s=13 TeV with the ATLAS detector. PHYSICS LETTERS. SECTION B, 822, 136651 [10.1016/j.physletb.2021.136651].

Search for resonances decaying into photon pairs in 139 fb−1 of pp collisions at s=13 TeV with the ATLAS detector

Camerlingo M. T.;D'Amico V.;Di Micco B.;Di Nardo R.;Martinelli L.;Orestano D.;Petrucci F.;Rossi E.;Salamanna G.;