Search for nonpointing photons in the diphoton and ETmiss final state in √s=7 TeV proton-proton collisions using the ATLAS detector. Physical Review D - Particles, Fields, Gravitation and Cosmology Volume 88, Issue 1, 1 July 2013, Article number 012001

14 сентября 2018
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Контактные данные автора публикации Aad, G.bp, Abajyan, T.ab, Abbott, B.ei, Abdallah, J.o, Abdel Khalek, S.em et.al.
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Аннотация

A search has been performed for photons originating in the decay of a neutral long-lived particle, exploiting the capabilities of the ATLAS electromagnetic calorimeter to make precise measurements of the flight direction of photons, as well as the calorimeters excellent time resolution. The search has been made in the diphoton plus missing transverse energy final state, using the full data sample of 4.8 fb-1 of 7 TeV proton-proton collisions collected in 2011 with the ATLAS detector at the LHC. No excess is observed above the background expected from Standard Model processes. The results are used to set exclusion limits in the context of gauge mediated supersymmetry breaking models, with the lightest neutralino being the next-to-lightest supersymmetric particle and decaying with a lifetime in excess of 0.25 ns into a photon and a gravitino.
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