• Browse all
Search for new phenomena in events with a photon and missing transverse momentum in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

The ATLAS collaboration
JHEP 1606 (2016) 059, 2016

Abstract (data abstract)
CERN-LHC. Results of a search for new phenomena in events with an energetic photon and large missing transverse momentum with the ATLAS experiment at the Large Hadron Collider are reported. The data were collected in proton--proton collisions at a centre-of-mass energy of 13 TeV and correspond to an integrated luminosity of 3.2 $\rm fb^{-1}$. The observed data are in agreement with the Standard Model expectations. Exclusion limits are presented in models of new phenomena including pair production of dark matter candidates or large extra spatial dimensions. In a simplified model of dark matter and an axial-vector mediator, the search excludes mediator masses of up to 710 GeV for dark matter candidate masses up to 150 GeV. In an effective theory of dark matter production, values of the suppression scale $M_*$ up to 570 GeV are excluded and the effect of truncation for various coupling values is reported. For the ADD large extra spatial dimension model the search places more stringent limits than earlier searches in the same event topology, excluding $M_{\rm D}$ up to about 2.3 (2.8) TeV for two (six) additional spatial dimensions; the limits are reduced by 20--40% depending on the number of additional spatial dimensions when applying a truncation procedure.

  • Table 1

    Data from Figure 3 left

    10.17182/hepdata.72855.v1/t1

    Distribution of missing transverse momentum, reconstructed treating muons as non-interacting particles, in the data and for the background in the...

  • Table 2

    Data from Figure 3 right

    10.17182/hepdata.72855.v1/t2

    Distribution of missing transverse momentum, reconstructed treating muons as non-interacting particles, in the data and for the background in the...

  • Table 3

    Data from Figure 4 left

    10.17182/hepdata.72855.v1/t3

    Distribution of missing transverse momentum, reconstructed treating electrons as non-interacting particles, in the data and for the background in the...

  • Table 4

    Data from Figure 4 right

    10.17182/hepdata.72855.v1/t4

    Distribution of missing transverse momentum in the data and for the background in the PhJetCR. The total background expectation is...

  • Table 5

    Data from Figure 5 left

    10.17182/hepdata.72855.v1/t5

    Distribution of missing transverse momentum in the signal region for data and for the background predicted from the fit in...

  • Table 6

    Data from Figure 5 right

    10.17182/hepdata.72855.v1/t6

    Distribution of photon transverse momentum in the signal region for data and for the background predicted from the fit in...

  • Table 7

    Data from Figure 6

    10.17182/hepdata.72855.v1/t7

    The observed and 95% CL exclusion limit for a simplified model of dark matter production involving an axial-vector operator, Dirac...

  • Table 8

    Data from Figure 7

    10.17182/hepdata.72855.v1/t8

    The observed 90% CL exclusion limit on the DM-proton scattering cross section in a simplifed model of dark matter production...

  • Table 9

    Data from Figure 8

    10.17182/hepdata.72855.v1/t9

    The observed 95% CL lower limits on $M_\ast$ for a dimension-7 operator EFT model with a contact interaction of type...

  • Table 10

    Data from Figure 9

    10.17182/hepdata.72855.v1/t10

    The observed 95% CL lower limits on the mass scale $M_D$ in the ADD models of large extra dimensions, for...

Loading Data...