Search for new phenomena in photon+jet events collected in proton--proton collisions at sqrt(s) = 8 TeV with the ATLAS detector

The ATLAS collaboration
Phys.Lett.B 728 (2014) 562-578, 2014.

Abstract (data abstract)
CERN-LHC. A model-independent search is made for the production of new resonances in photon + jet events using 20 fb^-1 of proton-proton LHC data recorded with the ATLAS detector in 2012 at a centre-of-mass energy of sqrt(s) = 8 TeV. The photon + jet mass distribution is compared to a background model fit from data; no significant deviation from the background-only hypothesis is found. Limits are set at 95% credibility level on generic Gaussian-shaped signals and two benchmark phenomena beyond the Standard Model: non-thermal quantum black holes and excited quarks. Non-thermal quantum black holes are excluded below masses of 4.6 TeV and excited quarks are excluded below masses of 3.5 TeV. UPDATE (16 APR 2014): SIG*BR in Table 4 now given with one less significant digit to better reflect precision at which q* cross section is known.

  • Table 1

    Data from Figure 1


    Invariant mass of the photon+jet pair for events passing the final selections. The number of observed events and the fit...

  • Table 2

    Data from Figure 2


    The 95% CL upper limits on SIG*BR*A*EPSILON for a hypothetical signal with a Gaussian-shaped M(GAMMA JET) distribution as a function...

  • Table 3

    Data from Figure 3


    Acceptance (A), efficiency (EPSILON), cross-section (SIG) and limits in number of events for the quantum black hole (QBH) benchmark model,...

  • Table 4

    Data from Figure 4


    Acceptance (A), efficiency (EPSILON), cross-section (SIG) and limits in number of events for the excited quark benchmark model, as a...

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