Abulaiti, Yiming
[7000.0, 8000.0]
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Search for non-pointing photons in the diphoton and missing transverse energy final state in 7 TeV proton-proton collisions using the ATLAS detector

The ATLAS collaboration Aad, Georges ; Abajyan, Tatevik ; Abbott, Brad ; et al.
Phys.Rev.D 88 (2013) 012001, 2013.
Inspire Record 1229502 DOI 10.17182/hepdata.61917

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 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.

3 data tables
Table 1

The 95% CL observed number of signal events vs lifetime for a neutralino with Lambda of 120 TeV together with the SM expectation and the predicition of the SPS8 GMSB model.

Table 2

The 95% CL observed cross-section vs lifetime for a neutralino with Lambda of 120 TeV together with the SM expectation and the predicition of the SPS8 GMSB model.

Table 3

The observed exclusion limits on neutralino lifetime as a function of lambda together with the SM expectation.