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Measurements of $W \gamma$ and $Z \gamma$ production in $pp$ collisions at $\sqrt{s}$=7  TeV with the ATLAS detector at the LHC

The ATLAS collaboration
Phys.Rev. D87 (2013) 112003, 2013

Abstract (data abstract)
CERN-LHC. Measurements of the cross sections for Wgamma and Zgamma production in proton proton collisions at a centre-of mass energy of 7 TeV. The integrated and differential fiducial cross sections for the production of a W or Z boson in association with a high-energy photon are measured at sqrt(s) = 7 TeV. The analyses use a data sample with an integrated luminosity of 4.6 fb^{-1} collected by the ATLAS detector during the 2011 LHC data-taking period. Events are selected using leptonic decays of the W and Z bosons (W(e nu, mu nu) and Z(e+ e-, mu+ mu-, nu nubar)) with the requirement of an associated isolated photon. The data are used to test the electroweak sector of the Standard Model and search for evidence for new phenomena. The measurements are used to probe the anomalous WWgamma, ZZgamma and Zgammagamma triple-gauge-boson couplings and to search for the production of vector resonances decaying to Zgamma and Wgamma. No deviations from Standard Model predictions are observed and limits are placed on anomalous triple-gauge-boson couplings and on the production of new vector meson resonances Specific Cuts for Wgamma (l;nu;gamma) decay channel inclusive measurement - PT of leading lepton > 25 GeV - Lepton kinematics account for photon contributions within Delta R=0.1 - pseudorapidity of lepton: |eta|<2.47 - PT of leading photon > 15 GeV - pseudorapidity of photon: |eta|<2.37 - Delta R(lepton;photon)>0.7 - photon relative isolation fraction<0.5 - missing transverse momentum >35GeV Specific Cuts for Wgamma (l;nu;gamma) decay channel exclusive measurement (with jet veto) - PT of leading lepton > 25 GeV - Lepton kinematics account for photon contributions within Delta R=0.1 - pseudorapidity of lepton: |eta|<2.47 - PT of leading photon > 15 GeV - pseudorapidity of leptons: |eta|<2.47 - Delta R(lepton;photon)>0.7 - photon relative isolation fraction<0.5 - missing transverse momentum >35GeV - No Truth Jets with PT > 30 GeV in |Y|<4.4 and |Delta R(jet,lepton)|>0.3 and |Delta R(jet,photon)|>0.3 (Particle-level jets defined by Anti- with =0.4500 500 1001 1004 1016 1020 Specific Cuts for Zgamma (l+;l-;gamma) decay channel inclusive measurement - PT of lepton > 25 GeV - Lepton kinematics account for photon contributions within Delta R=0.1 - pseudorapidity of leptons: |eta|<2.47 - PT of leading photon > 15 GeV - pseudorapidity of photon: |eta|<2.37 - Delta R(leptons;photon)>0.7 - photon relative isolation fraction<0.5 - dilepton mass > 40 GeV Specific Cuts for Zgamma (l+;l-;gamma) decay channel exclusive measurement (with jet veto) - PT of lepton > 25 GeV - Lepton kinematics account for photon contributions within Delta R=0.1 - pseudorapidity of leptons: |eta|<2.47 - PT of leading photon > 15 GeV - pseudorapidity of photon: |eta|<2.37 - Delta R(leptons;photon)>0.7 - photon relative isolation fraction<0.5 - dilepton mass > 40 GeV - No Truth Jets with PT > 30 GeV in |Y|<4.4 and |Delta R(jet,lepton)|>0.3 and |Delta R(jet,photon)|>0.3 (Particle-level jets defined by Anti- with =0.4500 500 1001 1004 1016 1020 Specific Cuts for Zgamma (nu;nubar;gamma) decay channel inclusive measurement - PT of leading photon > 100 GeV - photon relative isolation fraction < 0.5 - missing transverse momentum >90GeV Specific Cuts for Zgamma (nu;nubar;gamma) decay channel exclusive measurement (with jet veto) - PT of leading photon > 100 GeV - photon relative isolation fraction < 0.5 - missing transverse momentum >90GeV - No Truth Jets with PT > 30 GeV in |Y|<4.4 and |Delta R(jet,lepton)|>0.3 and |Delta R(jet,photon)|>0.3 (Particle-level jets defined by Anti- with =0.4500 500 1001 1004 1016 1020 Note added (25 JUN 2014): The cross section values reported in Tables 1,2,3,4,5,6,7,8,11,12 below should be multiplied by a factor of 1.0141 to take into account the updated value of the integrated luminosity for the ATLAS 2011 data taking period. The uncertainty on the global normalisation ("Lumi") remains at 1.8%. See Eur.Phys.J. C73 (2013) 2518 for more details.

  • Table 1

    Data from T7

    10.17182/hepdata.61926.v1/t1

    The measured inclusive fiducial cross section of Wgamma (l;nu;gamma) decay channel. The first systematic (sys) error is the combined systematic...

  • Table 2

    Data from T7

    10.17182/hepdata.61926.v1/t2

    The measured exclusive fiducial cross section of Wgamma (l;nu;gamma) decay channel. The first systematic (sys) error is the combined systematic...

  • Table 3

    Data from T7

    10.17182/hepdata.61926.v1/t3

    The measured inclusive fiducial cross section of Zgamma (l+;l-;gamma) decay channel. The first systematic (sys) error is the combined systematic...

  • Table 4

    Data from T7

    10.17182/hepdata.61926.v1/t4

    The measured exclusive fiducial cross section of Zgamma (l+;l-;gamma) decay channel. The first systematic (sys) error is the combined systematic...

  • Table 5

    Data from T7

    10.17182/hepdata.61926.v1/t5

    The measured inclusive fiducial cross section of Zgamma (nu;nubar;gamma) decay channel. The first systematic (sys) error is the combined systematic...

  • Table 6

    Data from T7

    10.17182/hepdata.61926.v1/t6

    The measured exclusive fiducial cross section of Zgamma (nu;nubar;gamma) decay channel. The first systematic (sys) error is the combined systematic...

  • Table 7

    Data from T8

    10.17182/hepdata.61926.v1/t7

    Differential fiducial cross section of Wgamma (l;nu;gamma) decay channel in bins of the leading photon PT. Leading Photon is the...

  • Table 8

    Data from T8

    10.17182/hepdata.61926.v1/t8

    Differential fiducial cross section of Wgamma (l;nu;gamma) decay channel in bins of the leading photon PT. Leading Photon is the...

  • Table 9

    Data from T8

    10.17182/hepdata.61926.v1/t9

    Normalised fiducial cross section of Wgamma (l;nu;gamma) decay channel in bins of the leading photon PT. Leading Photon is the...

  • Table 10

    Data from T8

    10.17182/hepdata.61926.v1/t10

    Normalised fiducial cross section of Wgamma (l;nu;gamma) decay channel in bins of the leading photon PT. Leading Photon is the...

  • Table 11

    Data from T8

    10.17182/hepdata.61926.v1/t11

    Differential fiducial cross section of Zgamma (l+;l-;gamma) decay channel in bins of the leading photon PT. Leading Photon is the...

  • Table 12

    Data from T8

    10.17182/hepdata.61926.v1/t12

    Differential fiducial cross section of Wgamma (l;nu;gamma) decay channel in bins of the leading photon PT. Leading Photon is the...

  • Table 13

    Data from T8

    10.17182/hepdata.61926.v1/t13

    Normalised fiducial cross section of Zgamma (l+;l-;gamma) decay channel in bins of the leading photon PT. Leading Photon is the...

  • Table 14

    Data from T8

    10.17182/hepdata.61926.v1/t14

    Normalised fiducial cross section of Zgamma (l+;l-;gamma) decay channel in bins of the leading photon PT. Leading Photon is the...

  • Table 15

    Data from T9

    10.17182/hepdata.61926.v1/t15

    Normalised fiducial cross section of Wgamma (l;nu;gamma) decay channel in bins of the jet multiplicity with leading photon pT >...

  • Table 16

    Data from T9

    10.17182/hepdata.61926.v1/t16

    Normalised fiducial cross section of Wgamma (l;nu;gamma) decay channel in bins of the jet multiplicity with leading photon pT >...

  • Table 17

    Data from T9

    10.17182/hepdata.61926.v1/t17

    Normalised fiducial cross section of Zgamma (l+;l+;gamma) decay channel in bins of the jet multiplicity with leading photon pT >...

  • Table 18

    Data from T9

    10.17182/hepdata.61926.v1/t18

    Normalised fiducial cross section of Zgamma (l+;l+;gamma) decay channel in bins of the jet multiplicity with leading photon pT >...

  • Table 19

    Data from T10

    10.17182/hepdata.61926.v1/t19

    Normalised fiducial cross section of Wgamma (l;nu;gamma) decay channel in bins of the transverse mass of Wgamma with leading photon...

  • Table 20

    Data from T11

    10.17182/hepdata.61926.v1/t20

    Normalised fiducial cross section of Zgamma (l+;l+;gamma) decay channel in bins of the mass of Zgamma with leading photon pT...

  • Table 21

    Data from T15

    10.17182/hepdata.61926.v1/t21

    The reconstruction efficiency of spin 1 narrow resonance a_T in low scale technicolor model decays to Wgamma (l;nu;gamma) final state...

  • Table 22

    Data from T15

    10.17182/hepdata.61926.v1/t22

    95% C.L. observed and expected upper limits on fiducial cross section of spin 1 narrow resonance decays to Wgamma (l;nu;gamma)...

  • Table 23

    Data from T14

    10.17182/hepdata.61926.v1/t23

    The reconstruction efficiency of spin 1 narrow resonance rho_T in low scale technicolor model decays to Zgamma (l+;l-;gamma) final state...

  • Table 24

    Data from T14

    10.17182/hepdata.61926.v1/t24

    95% C.L. observed and expected upper limits on fiducial cross section of spin 1 narrow resonance decays to Zgamma (l+;l+;gamma)...

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