Study of $Z \to ll\gamma$ decays at $\sqrt s~$= 8 TeV with the ATLAS detector

The ATLAS collaboration
Eur.Phys.J.C 84 (2024) 195, 2024.

Abstract
This paper presents a study of $Z \to ll\gamma~$decays with the ATLAS detector at the Large Hadron Collider. The analysis uses a proton-proton data sample corresponding to an integrated luminosity of 20.2 fb$^{-1}$ collected at a centre-of-mass energy $\sqrt{s}$ = 8 TeV. Integrated fiducial cross-sections together with normalised differential fiducial cross-sections, sensitive to the kinematics of final-state QED radiation, are obtained. The results are found to be in agreement with state-of-the-art predictions for final-state QED radiation. First measurements of $Z \to ll\gamma\gamma$ decays are also reported.

  • Table 1

    10.17182/hepdata.131524.v1/t1

    Unfolded $M(l^{+}\gamma)$ distribution for $Z \to ee\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>20$ GeV. Nexp.un f. = 63717.4...

  • Table 2

    10.17182/hepdata.131524.v1/t2

    Unfolded $M(l^{-}\gamma)$ distribution for $Z \to ee\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>20$ GeV. Nexp.un f. = 63855.8...

  • Table 3

    10.17182/hepdata.131524.v1/t3

    Unfolded $M(l^{+}\gamma)$ distribution for $Z \to \mu\mu\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>20$ GeV. Nexp.un f. = 64809.8...

  • Table 4

    10.17182/hepdata.131524.v1/t4

    Unfolded $M(l^{-}\gamma)$ distribution for $Z \to \mu\mu\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>20$ GeV. Nexp.un f. = 64822.9...

  • Table 5

    10.17182/hepdata.131524.v1/t5

    Unfolded dR distribution for $Z \to ee\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>20$ GeV. Nexp.un f. = 64273.2...

  • Table 6

    10.17182/hepdata.131524.v1/t6

    Unfolded dR distribution for $Z \to \mu\mu\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>20$ GeV. Nexp.un f. = 65362.4...

  • Table 7

    10.17182/hepdata.131524.v1/t7

    Unfolded $P_{T}^{\gamma}$ distribution for $Z \to ee\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>20$ GeV. Nexp.un f. = 63486.8...

  • Table 8

    10.17182/hepdata.131524.v1/t8

    Unfolded $P_{T}^{\gamma}$ distribution for $Z \to \mu\mu\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>20$ GeV. Nexp.un f. = 64432.6...

  • Table 9

    10.17182/hepdata.131524.v1/t9

    Unfolded $M(l^{+}\gamma)$ distribution for $Z \to ee\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>45$ GeV. Nexp.un f. = 57095.9...

  • Table 10

    10.17182/hepdata.131524.v1/t10

    Unfolded $M(l^{-}\gamma)$ distribution for $Z \to ee\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>45$ GeV. Nexp.un f. = 57130...

  • Table 11

    10.17182/hepdata.131524.v1/t11

    Unfolded $M(l^{+}\gamma)$ distribution for $Z \to \mu\mu\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>45$ GeV. Nexp.un f. = 58310.9...

  • Table 12

    10.17182/hepdata.131524.v1/t12

    Unfolded $M(l^{-}\gamma)$ distribution for $Z \to \mu\mu\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>45$ GeV. Nexp.un f. = 58320.9...

  • Table 13

    10.17182/hepdata.131524.v1/t13

    Unfolded dR distribution for $Z \to ee\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>45$ GeV. Nexp.un f. = 57705.4...

  • Table 14

    10.17182/hepdata.131524.v1/t14

    Unfolded dR distribution for $Z \to \mu\mu\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>45$ GeV. Nexp.un f. = 58869.2...

  • Table 15

    10.17182/hepdata.131524.v1/t15

    Unfolded $P_{T}^{\gamma}$ distribution for $Z \to ee\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>45$ GeV. Nexp.un f. = 57358.6...

  • Table 16

    10.17182/hepdata.131524.v1/t16

    Unfolded $P_{T}^{\gamma}$ distribution for $Z \to \mu\mu\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>45$ GeV. Nexp.un f. = 58226.4...

  • Table 17

    10.17182/hepdata.131524.v1/t17

    Unfolded $M(l^{+}\gamma)$ distribution for $Z \to ee\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>20$ GeV. Nexp.un f. = 63717.4...

  • Table 18

    10.17182/hepdata.131524.v1/t18

    Unfolded $M(l^{-}\gamma)$ distribution for $Z \to ee\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>20$ GeV. Nexp.un f. = 63855.8...

  • Table 19

    10.17182/hepdata.131524.v1/t19

    Unfolded $M(l^{+}\gamma)$ distribution for $Z \to \mu\mu\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>20$ GeV. Nexp.un f. = 64809.8...

  • Table 20

    10.17182/hepdata.131524.v1/t20

    Unfolded $M(l^{-}\gamma)$ distribution for $Z \to \mu\mu\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>20$ GeV. Nexp.un f. = 64822.9...

  • Table 21

    10.17182/hepdata.131524.v1/t21

    Unfolded dR distribution for $Z \to ee\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>20$ GeV. Nexp.un f. = 64273.2...

  • Table 22

    10.17182/hepdata.131524.v1/t22

    Unfolded dR distribution for $Z \to \mu\mu\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>20$ GeV. Nexp.un f. = 65362.4...

  • Table 23

    10.17182/hepdata.131524.v1/t23

    Unfolded $P_{T}^{\gamma}$ distribution for $Z \to ee\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>20$ GeV. Nexp.un f. = 63486.8...

  • Table 24

    10.17182/hepdata.131524.v1/t24

    Unfolded $P_{T}^{\gamma}$ distribution for $Z \to \mu\mu\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>20$ GeV. Nexp.un f. = 64432.6...

  • Table 25

    10.17182/hepdata.131524.v1/t25

    Unfolded $M(l^{+}\gamma)$ distribution for $Z \to ee\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>45$ GeV. Nexp.un f. = 57095.9...

  • Table 26

    10.17182/hepdata.131524.v1/t26

    Unfolded $M(l^{-}\gamma)$ distribution for $Z \to ee\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>45$ GeV. Nexp.un f. = 57130...

  • Table 27

    10.17182/hepdata.131524.v1/t27

    Unfolded $M(l^{+}\gamma)$ distribution for $Z \to \mu\mu\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>45$ GeV. Nexp.un f. = 58310.9...

  • Table 28

    10.17182/hepdata.131524.v1/t28

    Unfolded $M(l^{-}\gamma)$ distribution for $Z \to \mu\mu\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>45$ GeV. Nexp.un f. = 58320.9...

  • Table 29

    10.17182/hepdata.131524.v1/t29

    Unfolded dR distribution for $Z \to ee\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>45$ GeV. Nexp.un f. = 57705.4...

  • Table 30

    10.17182/hepdata.131524.v1/t30

    Unfolded dR distribution for $Z \to \mu\mu\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>45$ GeV. Nexp.un f. = 58869.2...

  • Table 31

    10.17182/hepdata.131524.v1/t31

    Unfolded $P_{T}^{\gamma}$ distribution for $Z \to ee\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>45$ GeV. Nexp.un f. = 57358.6...

  • Table 32

    10.17182/hepdata.131524.v1/t32

    Unfolded $P_{T}^{\gamma}$ distribution for $Z \to \mu\mu\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>45$ GeV. Nexp.un f. = 58226.4...

  • Table 33

    10.17182/hepdata.131524.v1/t33

    Truth $P_{T}^{Z}$ distribution after reweghting to data.

  • Table 34

    10.17182/hepdata.131524.v1/t34

    Combined Covariance Matrix for Unfolded $M(l^{+}\gamma)$ distribution for $Z \to ee\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>20$ GeV....

  • Table 35

    10.17182/hepdata.131524.v1/t35

    Combined Covariance Matrix for Unfolded $M(l^{-}\gamma)$ distribution for $Z \to ee\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>20$ GeV....

  • Table 36

    10.17182/hepdata.131524.v1/t36

    Combined Covariance Matrix for Unfolded $M(l^{+}\gamma)$ distribution for $Z \to \mu\mu\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>20$ GeV....

  • Table 37

    10.17182/hepdata.131524.v1/t37

    Combined Covariance Matrix for Unfolded $M(l^{-}\gamma)$ distribution for $Z \to \mu\mu\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>20$ GeV....

  • Table 38

    10.17182/hepdata.131524.v1/t38

    Combined Covariance Matrix for Unfolded dR distribution for $Z \to ee\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>20$ GeV....

  • Table 39

    10.17182/hepdata.131524.v1/t39

    Combined Covariance Matrix for Unfolded dR distribution for $Z \to \mu\mu\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>20$ GeV....

  • Table 40

    10.17182/hepdata.131524.v1/t40

    Combined Covariance Matrix for Unfolded $P_{T}^{\gamma}$ distribution for $Z \to ee\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>20$ GeV....

  • Table 41

    10.17182/hepdata.131524.v1/t41

    Combined Covariance Matrix for Unfolded $P_{T}^{\gamma}$ distribution for $Z \to \mu\mu\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>20$ GeV....

  • Table 42

    10.17182/hepdata.131524.v1/t42

    Combined Covariance Matrix for Unfolded $M(l^{+}\gamma)$ distribution for $Z \to ee\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>45$ GeV....

  • Table 43

    10.17182/hepdata.131524.v1/t43

    Combined Covariance Matrix for Unfolded $M(l^{-}\gamma)$ distribution for $Z \to ee\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>45$ GeV....

  • Table 44

    10.17182/hepdata.131524.v1/t44

    Combined Covariance Matrix for Unfolded $M(l^{+}\gamma)$ distribution for $Z \to \mu\mu\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>45$ GeV....

  • Table 45

    10.17182/hepdata.131524.v1/t45

    Combined Covariance Matrix for Unfolded $M(l^{-}\gamma)$ distribution for $Z \to \mu\mu\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>45$ GeV....

  • Table 46

    10.17182/hepdata.131524.v1/t46

    Combined Covariance Matrix for Unfolded dR distribution for $Z \to ee\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>45$ GeV....

  • Table 47

    10.17182/hepdata.131524.v1/t47

    Combined Covariance Matrix for Unfolded dR distribution for $Z \to \mu\mu\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>45$ GeV....

  • Table 48

    10.17182/hepdata.131524.v1/t48

    Combined Covariance Matrix for Unfolded $P_{T}^{\gamma}$ distribution for $Z \to ee\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>45$ GeV....

  • Table 49

    10.17182/hepdata.131524.v1/t49

    Combined Covariance Matrix for Unfolded $P_{T}^{\gamma}$ distribution for $Z \to \mu\mu\gamma$ process with dressed leptons and bkg subtraction. $M_{ll}>45$ GeV....

  • Table 50

    10.17182/hepdata.131524.v1/t50

    Combined Covariance Matrix for Unfolded $M(l^{+}\gamma)$ distribution for $Z \to ee\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>20$ GeV....

  • Table 51

    10.17182/hepdata.131524.v1/t51

    Combined Covariance Matrix for Unfolded $M(l^{-}\gamma)$ distribution for $Z \to ee\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>20$ GeV....

  • Table 52

    10.17182/hepdata.131524.v1/t52

    Combined Covariance Matrix for Unfolded $M(l^{+}\gamma)$ distribution for $Z \to \mu\mu\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>20$ GeV....

  • Table 53

    10.17182/hepdata.131524.v1/t53

    Combined Covariance Matrix for Unfolded $M(l^{-}\gamma)$ distribution for $Z \to \mu\mu\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>20$ GeV....

  • Table 54

    10.17182/hepdata.131524.v1/t54

    Combined Covariance Matrix for Unfolded dR distribution for $Z \to ee\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>20$ GeV....

  • Table 55

    10.17182/hepdata.131524.v1/t55

    Combined Covariance Matrix for Unfolded dR distribution for $Z \to \mu\mu\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>20$ GeV....

  • Table 56

    10.17182/hepdata.131524.v1/t56

    Combined Covariance Matrix for Unfolded $P_{T}^{\gamma}$ distribution for $Z \to ee\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>20$ GeV....

  • Table 57

    10.17182/hepdata.131524.v1/t57

    Combined Covariance Matrix for Unfolded $P_{T}^{\gamma}$ distribution for $Z \to \mu\mu\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>20$ GeV....

  • Table 58

    10.17182/hepdata.131524.v1/t58

    Combined Covariance Matrix for Unfolded $M(l^{+}\gamma)$ distribution for $Z \to ee\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>45$ GeV....

  • Table 59

    10.17182/hepdata.131524.v1/t59

    Combined Covariance Matrix for Unfolded $M(l^{-}\gamma)$ distribution for $Z \to ee\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>45$ GeV....

  • Table 60

    10.17182/hepdata.131524.v1/t60

    Combined Covariance Matrix for Unfolded $M(l^{+}\gamma)$ distribution for $Z \to \mu\mu\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>45$ GeV....

  • Table 61

    10.17182/hepdata.131524.v1/t61

    Combined Covariance Matrix for Unfolded $M(l^{-}\gamma)$ distribution for $Z \to \mu\mu\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>45$ GeV....

  • Table 62

    10.17182/hepdata.131524.v1/t62

    Combined Covariance Matrix for Unfolded dR distribution for $Z \to ee\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>45$ GeV....

  • Table 63

    10.17182/hepdata.131524.v1/t63

    Combined Covariance Matrix for Unfolded dR distribution for $Z \to \mu\mu\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>45$ GeV....

  • Table 64

    10.17182/hepdata.131524.v1/t64

    Combined Covariance Matrix for Unfolded $P_{T}^{\gamma}$ distribution for $Z \to ee\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>45$ GeV....

  • Table 65

    10.17182/hepdata.131524.v1/t65

    Combined Covariance Matrix for Unfolded $P_{T}^{\gamma}$ distribution for $Z \to \mu\mu\gamma$ process with bare leptons and bkg subtraction. $M_{ll}>45$ GeV....

  • Table 66

    10.17182/hepdata.131524.v1/t66

    Unfolded $M(l^{+}\gamma\gamma)$ distribution for $Z \to ll\gamma\gamma$ process with dressed leptons.

  • Table 67

    10.17182/hepdata.131524.v1/t67

    Unfolded $M(l^{+}\gamma\gamma)$ distribution for $Z \to ll\gamma\gamma$ process with bare leptons.

  • Table 68

    10.17182/hepdata.131524.v1/t68

    Unfolded dR distribution for $Z \to ll\gamma\gamma$ process with dressed leptons for leading photon.

  • Table 69

    10.17182/hepdata.131524.v1/t69

    Unfolded dR distribution for $Z \to ll\gamma\gamma$ process with bare leptons for leading photon.

  • Table 70

    10.17182/hepdata.131524.v1/t70

    Unfolded dR distribution for $Z \to ll\gamma\gamma$ process with dressed leptons for second photon.

  • Table 71

    10.17182/hepdata.131524.v1/t71

    Unfolded dR distribution for $Z \to ll\gamma\gamma$ process with bare leptons for second photon.

  • Table 72

    10.17182/hepdata.131524.v1/t72

    Unfolded dRgg distribution for $Z \to ll\gamma\gamma$ process with dressed leptons.

  • Table 73

    10.17182/hepdata.131524.v1/t73

    Unfolded dRgg distribution for $Z \to ll\gamma\gamma$ process with bare leptons.

  • Table 74

    10.17182/hepdata.131524.v1/t74

    Unfolded $P_{T}^{\gamma 1}$ distribution for $Z \to ll\gamma\gamma$ process with dressed leptons for leading photon.

  • Table 75

    10.17182/hepdata.131524.v1/t75

    Unfolded $P_{T}^{\gamma 1}$ distribution for $Z \to ll\gamma\gamma$ process with bare leptons for leading photon.

  • Table 76

    10.17182/hepdata.131524.v1/t76

    Unfolded $P_{T}^{\gamma 2}$ distribution for $Z \to ll\gamma\gamma$ process with dressed leptons for second photon.

  • Table 77

    10.17182/hepdata.131524.v1/t77

    Unfolded $P_{T}^{\gamma 2}$ distribution for $Z \to ll\gamma\gamma$ process with bare leptons for second photon.

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