CMS-PAS-EXO-14-017

CMS-PAS-EXO-14-017
Search for displaced photons using conversions at 8 TeV
CMS Collaboration
May 2015

Abstract: A search is performed for long-lived neutral particles decaying to photons and invisible particles. An example of a physics process leading to such a signature is the decay of the lightest neutralino with nonzero lifetime into a gravitino and a photon, as predicted by gauge-mediated supersymmetric models. The search is based on events containing at least two photons of which at least one has converted to an $\mathrm{ e^{+}e^{-} }$ pair, at least two jets, and missing transverse energy. The transverse impact parameter can be reconstructed using photons converting into $\mathrm{ e^{+}e^{-} }$ pairs. We consider scenarios in which the neutralino has a mean lifetime between $c\tau =$ 0.4 and 100 cm. The analysis was performed on a data sample collected by the CMS experiment at the LHC in 2012 at center-of-mass energy $\sqrt{s} =$ 8 TeV and corresponds to an integrated luminosity of 19.7 fb $^{-1}$ of proton--proton collisions.
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