Search for flavour-changing neutral-current couplings between the top quark and the photon with the ATLAS detector at $\sqrt{s} = 13$ TeV

The ATLAS collaboration
Phys.Lett.B 842 (2023) 137379, 2023.

Abstract (data abstract)
Search for flavour-changing neutral-current couplings between the top-quark and the photon with the ATLAS detector at $\sqrt{s} = 13$ TeV The analysis uses data collected in $pp$ collisions at $\sqrt{s} = 13$~TeV during the LHC Run 2 corresponding to an integrated luminosity of 139~fb$^{-1}$. Both FCNC top-quark production and decay are considered. The final state consists of a charged lepton, missing transverse momentum, a $b$-tagged jet, one high momentum photon and possibly additional jets. A multiclass deep neural network is used to classify events as either one of the two signal categories, FCNC production or decay, or as background. # hepdata_doi: 10.17182/hepdata.105039.v1

  • Figure 4 top

    Data from Figure 4 (top)

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    Post-fit distribution of a background-only fit to the NN discriminant in the SR for the $tu\gamma$ coupling. The last bin...

  • Figure 4 bottom left

    Data from Figure 4 (bottom left)

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    Post-fit distribution of a background-only fit to the photon transverse momentum distribution in the $t\bar{t}\gamma$ CR. The last bin of...

  • Figure 4 bottom right

    Data from Figure 4 (bottom right)

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    Post-fit distribution of a background-only fit to the photon transverse momentum distribution in the $W\gamma$+jets CR. The last bin of...

  • Figure 5 left

    Data from Figure 5 (left) and Table 2

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    The 95% CL limits on the effective coupling constants. The scale of new physics is set to $\Lambda = 1$...

  • Figure 5 right

    Data from Figure 5 (right) and Table 2

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    The 95% CL limits on the branching fractions. The scale of new physics is set to $\Lambda = 1$ TeV.

  • Figure Aux 03a

    Data from Auxiliary Figure 03a

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    The pre-fit distribution of the NN discriminant for the FCNC $tu\gamma$ LH signal scaled to 10 times the observed limit...

  • Figure Aux 03b

    Data from Auxiliary Figure 03b

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    The pre-fit distribution of the photon transverse momentum for SM backgrounds as well as measured data in the $t\bar{t}\gamma$ CR....

  • Figure Aux 03c

    Data from Auxiliary Figure 03c

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    The pre-fit distribution of the photon transverse momentum for the all SM backgrounds as well as measured data in the...

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