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@ARTICLE{Dasgupta:300805,
      author       = {Dasgupta, Basudeb and Kopp, Joachim and Schwaller, Pedro},
      title        = {{P}hotons, photon jets, and dark photons at 750 {G}e{V}
                      and beyond},
      journal      = {The European physical journal / C},
      volume       = {76},
      number       = {5},
      issn         = {1434-6052},
      address      = {Berlin},
      publisher    = {Springer},
      reportid     = {PUBDB-2016-02425, DESY-16-028. TIFR-TH-16-05. MITP-16-020.
                      arXiv:1602.04692},
      pages        = {277},
      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 $pp \to S \to aa \to
                      4\gamma$, where $S$ is a new scalar with a mass of 750 GeV
                      and $a$ is alight 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 thelifetime 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.},
      cin          = {T},
      ddc          = {530},
      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)16},
      UT           = {WOS:000376413000004},
      pubmed       = {pmid:28280432},
      eprint       = {1602.04692},
      howpublished = {arXiv:1602.04692},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1602.04692;\%\%$},
      doi          = {10.1140/epjc/s10052-016-4127-4},
      url          = {https://bib-pubdb1.desy.de/record/300805},
}