Dissecting Multi-Photon Resonances at the Large Hadron Collider
European Physical Journal C
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Allanach, B., Bhatia, D., & Iyer, A. (2017). Dissecting Multi-Photon Resonances at the Large Hadron Collider. European Physical Journal C, 77 (595)https://doi.org/10.1140/epjc/s10052-017-5162-5
We examine the phenomenology of the production, at the 13 TeV Large Hadron Collider (LHC), of the production 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 $\gamma$s from the $n$ decay are highly collinear and remain unresolved. We discuss how to discriminate this scenario from $X \rightarrow \gamma \gamma$: rather than discarding non-isolated photons, it is better instead to relax the isolation criterion and instead form photon jet substructure variables. The spins of $X$ and $n$ leave their imprint upon the distribution of pseudorapidity gap $\Delta \eta$ 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 $X \rightarrow \gamma \gamma$ decay in this manner. Information on the mass of $n$ can be gained by onsidering the mass of each photon jet.
This work has been partially supported by STFC ST/L000385/1.
External DOI: https://doi.org/10.1140/epjc/s10052-017-5162-5
This record's URL: https://www.repository.cam.ac.uk/handle/1810/273969
Attribution 4.0 International
Licence URL: http://creativecommons.org/licenses/by/4.0/
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