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@ARTICLE{Aad:207440,
      author       = {Aad, Georges and others},
      title        = {{O}bservation of {T}op-{Q}uark {P}air {P}roduction in
                      {A}ssociation with a {P}hoton and {M}easurement of the
                      $t\bar{t}\gamma$ {P}roduction {C}ross {S}ection in pp
                      {C}ollisions at $\sqrt{s}=7$ {T}e{V} using the {ATLAS}
                      {D}etector},
      reportid     = {PUBDB-2015-01348, CERN-PH-EP-2014-284. arXiv:1502.00586},
      year         = {2015},
      note         = {OA},
      abstract     = {A search is performed for top-quark pairs ($t\bar{t}$)
                      produced together with a photon ($\gamma$) with transverse
                      momentum $>20$ GeV using a sample of $t\bar{t}$ candidate
                      events in final states with jets, missing transverse
                      momentum, and one isolated electron or muon. The dataset
                      used corresponds to an integrated luminosity of 4.59
                      fb$^{-1}$ of proton-proton collisions at a center-of-mass
                      energy of 7 TeV recorded by the ATLAS detector at the CERN
                      Large Hadron Collider. In total 140 and 222 $t\bar{t}\gamma$
                      candidate events are observed in the electron and muon
                      channels, to be compared to the expectation of $79\pm 26$
                      and $120\pm 39$ non-$t\bar{t}\gamma$ background events
                      respectively. The production of $t\bar{t}\gamma$ events is
                      observed with a significance of 5.3 standard deviations away
                      from the null hypothesis. The $t\bar{t}\gamma$ production
                      cross section times the branching ratio (BR) of the
                      single-lepton decay channel is measured in a fiducial
                      kinematic region within the ATLAS acceptance. The measured
                      value is $\sigma_{t\bar{t}\gamma}^{fid} = 63 \pm 8 (stat.)
                      ^{+17}_{-13} (syst.) \pm 1 (lumi.)$ fb per lepton flavor, in
                      good agreement with the leading-order theoretical
                      calculation normalized to the next-to-leading-order
                      theoretical prediction of $48\pm 10$ fb.},
      cin          = {ATLAS},
      cid          = {I:(DE-H253)ATLAS-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF3-611)},
      pid          = {G:(DE-HGF)POF3-611},
      experiment   = {EXP:(DE-H253)LHC-Exp-ATLAS-20150101},
      typ          = {PUB:(DE-HGF)25 / PUB:(DE-HGF)15},
      eprint       = {1502.00586},
      howpublished = {arXiv:1502.00586},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1502.00586;\%\%$},
      url          = {https://bib-pubdb1.desy.de/record/207440},
}