Search for new phenomena in events with a photon and missing transverse momentum in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector

Results of a search for new phenomena in events with an energetic photon and large missing transverse momentum with the ATLAS experiment at the LHC are reported. Data were collected in proton-proton collisions at a center-of-mass energy of 8 TeV and correspond to an integrated luminosity of 20.3 fb-1. The observed data are well described by the expected Standard Model backgrounds. The expected (observed) upper limit on the fiducial cross section for the production of events with a photon and large missing transverse momentum is 6.1 (5.3) fb at 95% confidence level. Exclusion limits are presented on models of new phenomena with large extra spatial dimensions, supersymmetric quarks, and direct pair production of dark-matter candidates.

Note:

14 pages plus author list + cover pages (28 pages total), 19 figures, 1 table, submitted to Physical Review D, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2014-06. Fig 13 has been replaced and submitted as an Erratum: http://dx.doi.org/10.1103/PhysRevD.92.059903

13.85.Rm
13.85.Qk
14.70.Kv
14.80.Rt
p p: colliding beams
new physics: search for
transverse momentum: missing-energy
dark matter: pair production
p p: scattering
photon: final state

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ATLAS uses a right-handed coordinate system with its origin at the nominal interaction point (IP) in the center of the detector and the z-axis along the beam pipe. The xaxis points from the IP to the center of the LHC ring, and the y-axis points upward. Cylindrical coordinates (r, φ) are used in the transverse plane, φ being the azimuthal angle around the beam pipe. The pseudorapidity is defined in terms of the polar θ angle as η = - ln [tan(θ/2)]

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Search for new phenomena in events with a photon and missing transverse momentum in pppppp collisions at s=8\sqrt{s}=8s​=8 TeV with the ATLAS detector

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Search for new phenomena in events with a photon and missing transverse momentum in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector