Search for nonpointing photons in the diphoton and E[miss over T] final state in √s=7 TeV proton-proton collisions using the ATLAS detector
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Aad_Search-for-nonpointing.pdf
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Author(s)
Taylor, Frank E.
Date Issued
July 2013
Journal
Physical Review D
Publisher
American Physical Society
Citation
Aad, G., T. Abajyan, B. Abbott, J. Abdallah, S. Abdel Khalek, A. A. Abdelalim, O. Abdinov, et al. “Search for nonpointing photons in the diphoton and E_{T}^{miss} final state in sqrt[s]=7 TeV proton-proton collisions using the ATLAS detector.” Physical Review D 88, no. 1 (July 2013). © 2013 CERN
Version
Final published version
Abstract
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[superscript -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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.88.012001
