Preprint/Report PUBDB-2016-01400

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Photons, Photon Jets and Dark Photons at 750 GeV and Beyond

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2016

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Report No.: DESY-16-028; MITP-16-020; TIFR-TH-16-05; arXiv:1602.04692

Abstract: In new physics searches involving photons at the LHC, one challenge is to distinguish scenarios with isolated photons from models leading to 'photon jets'. For instance, in the context of the 750 GeV diphoton excess, it was pointed out that a true diphoton resonance $S \to \gamma\gamma$ can be mimicked by a process of the form $p p \to S \to a a \to 4\gamma$, where $S$ is a new scalar with a mass of 750 GeV and $a$ is a light pseudoscalar decaying to two collinear photons. Photon jets can be distinguished from isolated photons by exploiting the fact that a large fraction of photons convert to an $e^+e^-$ pair inside the inner detector. In this note, we quantify this discrimination power, and we study how the sensitivity of future searches differs for photon jets compared to isolated photons. We also investigate how our results depend on the lifetime of the particle(s) decaying to the photon jet. Finally, we discuss the extension to $S\to A^\prime A^\prime\to e^+e^-e^+e^-$, where there are no photons at all but the dark photon $A^\prime$ decays to $e^+e^-$ pairs. Our results will be useful in future studies of the putative 750 GeV signal, but also more generally in any new physics search involving hard photons.

Keyword(s): photon: jet ; new physics ; two-photon ; CERN LHC Coll ; pseudoscalar ; sensitivity ; collinear ; lifetime


Contributing Institute(s):
  1. Theorie-Gruppe (T)
Research Program(s):
  1. 611 - Fundamental Particles and Forces (POF3-611) (POF3-611)
  2. nuDirections - New Directions in Theoretical Neutrino Physics (637506) (637506)
Experiment(s):
  1. No specific instrument

Appears in the scientific report 2016
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http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article  ;  ;
Photons, photon jets, and dark photons at 750 GeV and beyond
The European physical journal / C 76(5), 277 () [10.1140/epjc/s10052-016-4127-4]  GO OpenAccess  Download fulltext Files  Download fulltextFulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS


 Record created 2016-03-21, last modified 2021-11-10


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