Abstract
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.
Highlights
Many theories of physics beyond the Standard Model (SM) predict the presence of new high-mass states which can currently only be produced in the high-energy collisions at the Large HadronCollider (LHC)
The largest background component comes from the non-resonant production of photon pairs (γ γ events); smaller backgrounds come from events containing a photon and a jet (γ j events) and events with two jets ( j j events), where the jets are misidentified as photons
The diphoton invariant mass distribution of the events passing the selection is shown in Fig. 3, along with the background-only fit
Summary
Many theories of physics beyond the Standard Model (SM) predict the presence of new high-mass states which can currently only be produced in the high-energy collisions at the Large HadronCollider (LHC). This Letter presents a decaying into two photons usesainrgch13fo9rfbn−e1wofh√ighs -=m1a3ssTereVsopnroatnocne–s proton (pp) collision data recorded by the ATLAS detector from 2015 to 2018 at the LHC This analysis searches for a generic resonance using two benchmark signal models: a spin-0 resonant state ( X ), which is predicted by many models that include extensions to the Higgs sector [1,2,3,4,5,6,7]; and a spin-2 graviton (G∗), taken here to be the lightest Kaluza–Klein (KK) [8] excitation in a Randall–. [11] include a common event selection for the spin-0 and spin-2 resonance searches, the use of the functional decomposition method [13] to assess the spurious-signal uncertainty, and updates to the photon reconstruction, identification, isolation and energy calibration.
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