Search for nonpointing and delayed photons in the diphoton and missing transverse momentum final state in 8 TeV <i>pp</i> collisions at the LHC using the ATLAS detector



Aad, G, Abbott, B, Abdallah, J, Khalek, S Abdel, Abdinov, O, Aben, R, Abi, B, Abolins, M, AbouZeid, OS, Abramowicz, H
et al (show 2881 more authors) (2014) Search for nonpointing and delayed photons in the diphoton and missing transverse momentum final state in 8 TeV <i>pp</i> collisions at the LHC using the ATLAS detector. PHYSICAL REVIEW D, 90 (11). 112005-.

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Abstract

A search has been performed, using the full 20.3 fb$^{-1}$ data sample of 8 TeV proton--proton collisions collected in 2012 with the ATLAS detector at the LHC, for photons originating from a displaced vertex due to the decay of a neutral long-lived particle into a photon and an invisible particle. The analysis investigates the diphoton plus missing transverse momentum final state, and is therefore most sensitive to pair-production of long-lived particles. The analysis technique exploits the capabilities of the ATLAS electromagnetic calorimeter to make precise measurements of the flight direction, as well as the time of flight, of photons. No excess is observed over the Standard Model predictions for background. Exclusion limits are set within the context of Gauge Mediated Supersymmetry Breaking models, with the lightest neutralino being the next-to-lightest supersymmetric particle and decaying into a photon and gravitino with a lifetime in the range from 250 ps to about 100 ns.

Item Type: Article
Additional Information: 16 pages plus author list + cover pages (30 pages total), 7 figures, 5 tables, submitted to Physics Review D, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2013-17/
Uncontrolled Keywords: hep-ex, hep-ex
Depositing User: Symplectic Admin
Date Deposited: 06 Aug 2015 08:21
Last Modified: 05 Oct 2023 09:27
DOI: 10.1103/PhysRevD.90.112005
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/2018901