Search for resonances decaying into photon pairs in 139 fb$^{-1}$ of $pp$ collisions at $\sqrt{s} =$ 13 TeV with the ATLAS detector

The ATLAS collaboration
Aad, Georges , Abbott, Braden Keim , Abbott, Brad , Abbott, Dale , Abed Abud, Adam , Abeling, Kira , Abhayasinghe, Deshan Kavishka , Abidi, Haider , Abouzeid, Hass , Abouzeid, Ossama
Phys.Lett.B 822 (2021) 136651, 2021.

Abstract (data abstract)
CERN-LHC. Search for resonances decay into photon pairs in 139 fb^{-1} of proton-proton collisions collected at a centre-of-mass energy of 13 TeV with the ATLAS detector between 2015--2018. The fiducial region for the combined spin-0/spin-2 resonance search is defined as: - 2 photons - E_T > 0.3 m_gamgam for the photon with leading E_T, and E_T > 0.25 m_gamgam for the photon with sub-leading E_T - |eta_gam| < 2.37 - An isolation requirement using all particles with lifetime greater than 10 ps at the generator level in a cone of Delta_R = 0.4 around the photon direction: E^iso_T< 0.05 E_T + 6 GeV. For the spin-2 resonance search, the acceptance and efficiencies are assumed to be those obtained from MC simulation of KK graviton decays.

Version 2 modifications: Corrected typo of the width used in Table 3

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