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

^{- 1}

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 (stat .)_{- 71}^{+ 75} (syst .)

fb, to be compared with the Standard Model prediction of

515_{- 42}^{+ 36}

fb at next-to-leading order in QCD.

Fitted fiducial cross sections

10.17182/hepdata.134244.v1/t1

This table shows the values for $σ_{t q γ} \times B (t \to l ν b)$ and $σ_{t q γ} \times B (t \to l ν b) + σ_{t (\to l ν b γ) q}$ obtained by a profile-likelihood fit...
Figure 02

Data from Figure 02

10.17182/hepdata.134244.v1/t2

Distribution of the reconstructed top-quark mass in the $W γ$ CR before the profile-likelihood fit. The "Total" column corresponds to the sum...
Figure 03a

Data from Figure 03a

10.17182/hepdata.134244.v1/t3

Distribution of the NN output in the 0fjSR in data and the expected contribution of the signal and background processes...
Figure 03b

Data from Figure 03b

10.17182/hepdata.134244.v1/t4

Distribution of the NN output in the $\geq$ 1fjSR in data and the expected contribution of the signal and background processes...
Figure 03c

Data from Figure 03c

10.17182/hepdata.134244.v1/t5

Distribution of the NN output in the $t \bar{t} γ$ 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 $W γ$ 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 0fjSR in data and for the sum of...
Figure Aux 05b

Data from Auxiliary Figure 05b

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Distribution of the $η$ of the $b$ -tagged jet in the 0fjSR 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 0fjSR 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 $p_{T}$ of the top-quark+photon system in the 0fjSR in data and for the sum of all processes...
Figure Aux 06a

Data from Auxiliary Figure 06a

10.17182/hepdata.134244.v1/t11

Distribution of the photon $p_{T}$ in the 0fjSR 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 $η$ in the 0fjSR in data and for the sum of all processes expectations before the...
Figure Aux 07a

Data from Auxiliary Figure 07a

10.17182/hepdata.134244.v1/t13

Distribution of the scalar sum of the jet transverse momenta in the $\geq$ 1fjSR in data and for the sum of...
Figure Aux 07b

Data from Auxiliary Figure 07b

10.17182/hepdata.134244.v1/t14

Distribution of the invariant mass of the $b$ -tagged jet and the highest- $p_{T}$ forward jet in the $\geq$ 1fjSR in data and...
Figure Aux 07c

Data from Auxiliary Figure 07c

10.17182/hepdata.134244.v1/t15

Distribution of $p_{T}$ of the highest- $p_{T}$ forward jet in the $\geq$ 1fjSR in data and for the sum of all processes...
Figure Aux 07d

Data from Auxiliary Figure 07d

10.17182/hepdata.134244.v1/t16

Distribution of the difference in $η$ between the highest- $p_{T}$ forward jet and the photon in the $\geq$ 1fjSR in data and...
Figure Aux 08a

Data from Auxiliary Figure 08a

10.17182/hepdata.134244.v1/t17

Distribution of the energy of the system formed by the highest- $p_{T}$ forward jet and the photon in the $\geq$ 1fjSR in...
Figure Aux 08b

Data from Auxiliary Figure 08b

10.17182/hepdata.134244.v1/t18

Distribution of the $η$ of the $b$ -tagged jet in the $\geq$ 1fjSR in data and for the sum of all processes...
Figure Aux 08c

Data from Auxiliary Figure 08c

10.17182/hepdata.134244.v1/t19

Distribution of the reconstructed top-quark mass in the $\geq$ 1fjSR 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 $p_{T}$ of the top-quark and photon system in the $\geq$ 1fjSR in data and for the sum of...
Figure Aux 09a

Data from Auxiliary Figure 09a

10.17182/hepdata.134244.v1/t21

Distribution of the photon $p_{T}$ in the $\geq$ 1fjSR in data and for the sum of all processes expectations before the...
Figure Aux 09b

Data from Auxiliary Figure 09b

10.17182/hepdata.134244.v1/t22

Distribution of the photon $η$ in the $\geq$ 1fjSR in data and for the sum of all processes expectations before the...
Figure Aux 10a

Data from Auxiliary Figure 10a

10.17182/hepdata.134244.v1/t23

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)

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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...

Fitted fiducial cross sections

Figure 02

Figure 03a

Figure 03b

Figure 03c

Figure Aux 04

Figure Aux 05a

Figure Aux 05b

Figure Aux 05c

Figure Aux 05d

Figure Aux 06a

Figure Aux 06b

Figure Aux 07a

Figure Aux 07b

Figure Aux 07c

Figure Aux 07d

Figure Aux 08a

Figure Aux 08b

Figure Aux 08c

Figure Aux 08d

Figure Aux 09a

Figure Aux 09b

Figure Aux 10a

Figure Aux 10b

Table 1

Table 2

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