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@ARTICLE{Dasgupta:296364,
      author       = {Dasgupta, Basudeb and Kopp, Joachim and Schwaller, Pedro},
      title        = {{P}hotons, {P}hoton {J}ets and {D}ark {P}hotons at 750
                      {G}e{V} and {B}eyond},
      reportid     = {PUBDB-2016-01400, TIFR-TH-16-05. MITP-16-020. DESY-16-028.
                      arXiv:1602.04692},
      year         = {2016},
      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.},
      keywords     = {photon: jet (autogen) / new physics (autogen) / two-photon
                      (autogen) / CERN LHC Coll (autogen) / pseudoscalar (autogen)
                      / sensitivity (autogen) / collinear (autogen) / lifetime
                      (autogen)},
      cin          = {T},
      cid          = {I:(DE-H253)T-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF3-611) /
                      nuDirections - New Directions in Theoretical Neutrino
                      Physics (637506)},
      pid          = {G:(DE-HGF)POF3-611 / G:(EU-Grant)637506},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)25 / PUB:(DE-HGF)29},
      eprint       = {1602.04692},
      howpublished = {arXiv:1602.04692},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1602.04692;\%\%$},
      url          = {https://bib-pubdb1.desy.de/record/296364},
}