Abstract
High-mass states decaying into two photons are predicted in many extensions of the Standard Model (SM). The diphoton final state provides a clean experimental signature with good invariant mass resolution and moderate backgrounds. Searches for high-mass resonances decaying into two photons for a spin-0 or spin-2 state are presented. The latest ATLAS results using p-p collision data at 13 TeV and covering a large mass range are discussed.
Highlights
Searches for high-mass resonances deca√ying into two photons using CERN Large Hadron Collider (LHC) proton–proton collision data at s= 13 TeV recorded in 2015 by the ATLAS detector and corresponding During the to an LHC integrated lumino√sity of 3.2 fb−1 Run-1 period, at s= 7 TeV and are described. 8 TeV, more than fb−1 of data were recorded and searches for diphoton resonances have been reported by the ATLAS and CMS collaborations [1–5]
We look for the lightest Kaluz√a–Klein [9] spin-2 graviton excitation (G∗) with a dimensionless coupling k/MPl, where MPl = MPl/ 8π is the reduced Planck scale and k the curvature scale of the extra dimension
Monte Carlo (MC) samples are produced for different hypotheses of the spin-0 boson mass in the range 200 GeV to 2000 GeV and of the decay width (ΓX) up to 10% of mX
Summary
Searches for high-mass resonances deca√ying into two photons using CERN Large Hadron Collider (LHC) proton–proton collision data at s= 13 TeV recorded in 2015 by the ATLAS detector and corresponding During the to an LHC integrated lumino√sity of 3.2 fb−1 Run-1 period, at s= 7 TeV and are described. 8 TeV, more than fb−1 of data were recorded and searches for diphoton resonances have been reported by the ATLAS and CMS collaborations [1–. 8 TeV, more than fb−1 of data were recorded and searches for diphoton resonances have been reported by the ATLAS and CMS collaborations [1–. The analyses were performed using two benchmark models: the diphoton decay resulting from a hypothetical particle of spin-0 or spin-2. This implies that diphotons have different kinematic properties depending on the model used. This means that one needs to apply two different selections, with looser kinematic selection requirements for the spin-2 resonance search. The photon identification criteria and the event pre-selection are common to both searches
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