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- W2291607416 abstract "A light meta-stable dark photon decaying into collimated electron/positron pair can fake a photon, either converted or unconverted, at the LHC. The detailed object identification relies on the specifics of the detector and strategies for the reconstruction. We study the fake rate based on the ATLAS (CMS) detector geometry and show that it can be O(1) with a generic choice of parameters. Especially, the probability of being registered as a photon is angular dependent. If the dark photon is the product of a heavy resonance decay, e.g. the recent hint of 750 GeV at the LHC, such detector effects can induce bias when determine the spin of the resonance. If the decay products from the heavy resonance are one photon and one dark photon, which has a large probability to fake a diphoton event, the resonance is allowed to be a vector. Due to the difference in detector, the cross sections measured in ATLAS and CMS do not necessarily match. In addition to the 750 GeV excess, the issue studied here is relevant also for any future new physics searches with photon(s) in the final state. We discuss possible ways of distinguishing dark photon decay and real photon in the future." @default.
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- W2291607416 date "2016-02-29" @default.
- W2291607416 modified "2023-09-27" @default.
- W2291607416 title "Faking The Diphoton Excess by Displaced Dark Photon Decays" @default.
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