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Search for nonpointing photons in the diphoton and E-T(miss) final state in root s=7 TeV proton-proton collisions using the ATLAS detector
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics.
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2013 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 88, no 1, 012001- p.Article in journal (Refereed) Published
Abstract [en]

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 calorimeter's 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.

Place, publisher, year, edition, pages
2013. Vol. 88, no 1, 012001- p.
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Physical Sciences
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URN: urn:nbn:se:su:diva-92641DOI: 10.1103/PhysRevD.88.012001ISI: 000321125000002OAI: oai:DiVA.org:su-92641DiVA: diva2:641652
Note

AuthorCount:2924;

Available from: 2013-08-19 Created: 2013-08-14 Last updated: 2017-12-06Bibliographically approved

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Abulaiti, YimingÅsman, BarbroBendtz, KatarinaBohm, ChristianClément, ChristopheEriksson, DanielGellerstedt, KarlHellman, StenHolmgren, Sven-OlofJohansen, MarianneJohansson, K. ErikJon-And, KerstinKhandanyan, HovhannesKim, HyeonKlimek, PawelLundberg, JohanLundberg, OlofMilstead, David A.Moa, TorbjörnPapadelis, ArasPetridis, AndreasPlucinski, PawelSilverstein, Samuel B.Sjölin, JörgenStrandberg, SaraTylmad, MajaYang, Zhaoyu
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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