2017/06/30 by B. C. Allanach, Disha Bhatia, D. Bhatia +2 · 13 citations
Physics and Astronomy · #Collider #Hadron #High-Energy Particle Collisions Research #Invariant mass #Large Hadron Collider #Massless particle #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Phenomenology (philosophy) #Photon #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Rapidity #Resonance (particle physics) #Scalar (mathematics) #Spins #Substructure #hep-ex #hep-ph
paper · pdf · doi:10.1140/epjc/s10052-017-5162-5
published in The European Physical Journal C 77(9), 595 (Springer Science+Business Media) · 26 pages, 7 figures. v2 incorporates extra discussion in response to referee and a discussion of photon conversion
arxiv created 2017/08/22 · openalex publication_date 2017/09/01 · arxiv updated 2017/10/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We examine the phenomenology of the production, at the 13 TeV Large Hadron Collider (LHC), of a heavy resonance X, which decays via other new on-shell particles n into multi-(i.e. three or more) photon final states. In the limit that n has a much smaller mass than X, the multi-photon final state may dominantly appear as a two-photon final state because the γ s from the n decay are highly collinear and remain unresolved. We discuss how to discriminate this scenario from X → γ γ : rather than discarding non-isolated photons, it is better to relax the isolation criteria and instead form photon jets substructure variables. The spins of X and n leave their imprint upon the distribution of pseudo-rapidity gap Δ η between the apparent two-photon states. Depending on the total integrated luminosity, this can be used in many cases to claim discrimination between the possible spin choices of X and n, although the case where X and n are both scalar particles cannot be discriminated from the direct X → γ γ decay in this manner. Information on the mass of n can be gained by considering the mass of each photon jet.