Spin-analysis of s-channel diphoton resonances at the LHC

Abstract

The high mass neutral quantum states envisaged by theories of physics beyond the standard model can at the hadron colliders reveal themselves through their decay into a pair of photons. Once such a peak in the diphoton invariant mass distribution is discovered, the determination of its spin through the distinctive photon angular distributions is needed in order to identify the associated nonstandard dynamics. We here discuss the discrimination of the spin-2 Randall-Sundrum graviton excitation against the hypothesis of a spin-0 exchange giving the same number of events under the peak, by means of the angular analysis applied to resonant diphoton events expected to be observed at the LHC. The spin-0 hypothesis is modelled by an effective interaction of a high mass gauge singlet scalar particle interacting with the standard model fields. The basic observable of our analysis is the symmetrically integrated angular asymmetry $A_{CE}$, calculated for both graviton and scalar s-channel exchanges to next-to-leading order in QCD.

28 pages, 13 figures, 1 table

References in corpus (11)

• Vector boson pair production at the LHC
• Search for Resonances in the Dilepton Mass Distribution in pp Collisions at sqrt(s) = 7 TeV
• Diphoton signals in theories with large extra dimensions to NLO QCD at hadron colliders
• Search for Large Extra Dimensions in the Diphoton Final State at the Large Hadron Collider
• Spin identification of the Randall-Sundrum resonance in lepton-pair production at the LHC
• Using Final State Pseudorapidities to Improve s-channel Resonance Observables at the LHC
• Telling the spin of the "Higgs boson" at the LHC
• Search for Randall-Sundrum Gravitons in the Diphoton Channel at CDF
• RS model with a small curvature and two-photon production at the LHC
• Signals of single particle production at the earliest LHC
• Early (and Later) LHC Search Strategies for Broad Dimuon Resonances

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• Resummed inclusive cross-section in Randall-Sundrum model at NNLO+NNLL
• Next-to-Next-to-Leading Order QCD Corrections in Models of TeV-Scale Gravity
• Dissecting Multi-Photon Resonances at the Large Hadron Collider
• Resummed inclusive cross-section in ADD model at N${}^3$LL+NNLO
• Optimizing Polar Angle Asymmetry Observables at Colliders
• The Higgs-like boson spin from the center-edge asymmetry in the diphoton channel