Observation of single-top-quark production in association with a photon using the ATLAS detector

The ATLAS collaboration
Phys.Rev.Lett. 131 (2023) 181901, 2023.

Abstract (data abstract)
Observation of single-top-quark production in association with a photon using the ATLAS detector This Letter reports the observation of single top quarks produced together with a photon using $139\,$fb$^{-1}$ of $13\,$TeV proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider. The analysis uses the presence of a forward jet, characteristic of $t$-channel production, and separates the signal from the background with neural networks. Requiring a photon with transverse momentum larger than $20\,$GeV and within the detector acceptance, the fiducial cross section is measured to be $688\,\pm\,23 \, \mathrm{(stat.)} \, ^{+75}_{-71} \, \mathrm{(syst.)}\,$fb, to be compared with the Standard Model prediction of $515\,^{+36}_{-42}\,$fb at next-to-leading order in QCD.

  • Fitted fiducial cross sections

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    This table shows the values for $\sigma_{tq\gamma}\times\mathcal{B}(t\rightarrow l\nu b)$ and $\sigma_{tq\gamma}\times\mathcal{B}(t\rightarrow l\nu b)+\sigma_{t(\rightarrow l\nu b\gamma)q}$ obtained by a profile-likelihood fit...

  • Figure 02

    Data from Figure 02

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    Distribution of the reconstructed top-quark mass in the $W\gamma\,$CR before the profile-likelihood fit. The "Total" column corresponds to the sum...

  • Figure 03a

    Data from Figure 03a

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    Distribution of the NN output in the 0fj$\,$SR in data and the expected contribution of the signal and background processes...

  • Figure 03b

    Data from Figure 03b

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    Distribution of the NN output in the $\geq$1fj$\,$SR in data and the expected contribution of the signal and background processes...

  • Figure 03c

    Data from Figure 03c

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    Distribution of the NN output in the $t\bar{t}\gamma\,$CR in data and the expected contribution of the signal and background processes...

  • Figure Aux 04

    Data from Auxiliary Figure 04

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    Total event yield in the $W\gamma\,$CR in data and the expected contribution of the signal and background processes after the...

  • Figure Aux 05a

    Data from Auxiliary Figure 05a

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    Distribution of the scalar sum of the jet transverse momenta in the 0fj$\,$SR in data and for the sum of...

  • Figure Aux 05b

    Data from Auxiliary Figure 05b

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    Distribution of the $\eta$ of the $b$-tagged jet in the 0fj$\,$SR in data and for the sum of all processes...

  • Figure Aux 05c

    Data from Auxiliary Figure 05c

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    Distribution of the reconstructed top-quark mass in the 0fj$\,$SR in data and for the sum of all processes expectations before...

  • Figure Aux 05d

    Data from Auxiliary Figure 05d

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    Distribution of the $p_{\mathrm{T}}$ of the top-quark+photon system in the 0fj$\,$SR in data and for the sum of all processes...

  • Figure Aux 06a

    Data from Auxiliary Figure 06a

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    Distribution of the photon $p_{\mathrm{T}}$ in the 0fj$\,$SR in data and for the sum of all processes expectations before the...

  • Figure Aux 06b

    Data from Auxiliary Figure 06b

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    Distribution of the photon $\eta$ in the 0fj$\,$SR in data and for the sum of all processes expectations before the...

  • Figure Aux 07a

    Data from Auxiliary Figure 07a

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    Distribution of the scalar sum of the jet transverse momenta in the $\geq$1fj$\,$SR in data and for the sum of...

  • Figure Aux 07b

    Data from Auxiliary Figure 07b

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    Distribution of the invariant mass of the $b$-tagged jet and the highest-$p_{\mathrm{T}}$ forward jet in the $\geq$1fj$\,$SR in data and...

  • Figure Aux 07c

    Data from Auxiliary Figure 07c

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    Distribution of $p_{\mathrm{T}}$ of the highest-$p_{\mathrm{T}}$ forward jet in the $\geq$1fj$\,$SR in data and for the sum of all processes...

  • Figure Aux 07d

    Data from Auxiliary Figure 07d

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    Distribution of the difference in $\eta$ between the highest-$p_{\mathrm{T}}$ forward jet and the photon in the $\geq$1fj$\,$SR in data and...

  • Figure Aux 08a

    Data from Auxiliary Figure 08a

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    Distribution of the energy of the system formed by the highest-$p_{\mathrm{T}}$ forward jet and the photon in the $\geq$1fj$\,$SR in...

  • Figure Aux 08b

    Data from Auxiliary Figure 08b

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    Distribution of the $\eta$ of the $b$-tagged jet in the $\geq$1fj$\,$SR in data and for the sum of all processes...

  • Figure Aux 08c

    Data from Auxiliary Figure 08c

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    Distribution of the reconstructed top-quark mass in the $\geq$1fj$\,$SR in data and for the sum of all processes expectations before...

  • Figure Aux 08d

    Data from Auxiliary Figure 08d

    10.17182/hepdata.134244.v1/t20

    Distribution of the $p_{\mathrm{T}}$ of the top-quark and photon system in the $\geq$1fj$\,$SR in data and for the sum of...

  • Figure Aux 09a

    Data from Auxiliary Figure 09a

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    Distribution of the photon $p_{\mathrm{T}}$ in the $\geq$1fj$\,$SR in data and for the sum of all processes expectations before the...

  • Figure Aux 09b

    Data from Auxiliary Figure 09b

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    Distribution of the photon $\eta$ in the $\geq$1fj$\,$SR in data and for the sum of all processes expectations before the...

  • Figure Aux 10a

    Data from Auxiliary Figure 10a

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    Ordered list of the 30 systematic uncertainties with the largest impact on the measured signal normalisation in the fit to...

  • Figure Aux 10b

    Data from Auxiliary Figure 10b

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    Ordered list of the 30 systematic uncertainties with the largest impact on the measured signal normalisation in the fit to...

  • Table 1

    Description of fiducial phase definition for parton-level measurement (paragraph 7)

    10.17182/hepdata.134244.v1/t25

    This table lists the kinematic requirements on parton-level objects used to define of the fiducial phase space for the parton-level...

  • Table 2

    Description of fiducial phase definition for particle-level measurement (paragraph 8)

    10.17182/hepdata.134244.v1/t26

    This table lists the kinematic requirements on particle-level objects used to define of the fiducial phase space for the particle-level...

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