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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
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle 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
American Physical Society , 2013. Vol. 88, no 1, 012001- p.
Keyword [en]
Dynamical Supersymmetry Breaking, Missing Transverse-Momentum, Supergauge Transformations, Model, Generators, Extension, Particle, Currents, Physics, Events
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-125599DOI: 10.1103/PhysRevD.88.012001ISI: 000321125000002Scopus ID: 2-s2.0-84881278349OAI: oai:DiVA.org:kth-125599DiVA: diva2:639961
Funder
Swedish Research Council
Note

QC 20130812. Author count: 2924

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

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Strandberg, Jonas

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Jovicevic, JelenaKuwertz, EmmaLund-Jensen, BengtStrandberg, Jonas
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