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.
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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
10.17182/hepdata.134244.v1/t2
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
10.17182/hepdata.134244.v1/t3
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
10.17182/hepdata.134244.v1/t4
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
10.17182/hepdata.134244.v1/t5
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
10.17182/hepdata.134244.v1/t7
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
10.17182/hepdata.134244.v1/t8
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
10.17182/hepdata.134244.v1/t9
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
10.17182/hepdata.134244.v1/t10
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
10.17182/hepdata.134244.v1/t11
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
10.17182/hepdata.134244.v1/t12
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
10.17182/hepdata.134244.v1/t13
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
10.17182/hepdata.134244.v1/t14
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
10.17182/hepdata.134244.v1/t15
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
10.17182/hepdata.134244.v1/t16
Distribution of the difference in $\eta$ between the highest-$p_{\mathrm{T}}$ forward jet and the photon in the $\geq$1fj$\,$SR in data and...
Figure Aux 08a
Data from Auxiliary Figure 08a
10.17182/hepdata.134244.v1/t17
Distribution of the energy of the system formed by the highest-$p_{\mathrm{T}}$ forward jet and the photon in the $\geq$1fj$\,$SR in...
Figure Aux 08b
Data from Auxiliary Figure 08b
10.17182/hepdata.134244.v1/t18
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
10.17182/hepdata.134244.v1/t19
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
10.17182/hepdata.134244.v1/t21
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
10.17182/hepdata.134244.v1/t22
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
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
10.17182/hepdata.134244.v1/t24
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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Observation of single-top-quark production in association with a photon using the ATLAS detector. HEPData (collection).
https://doi.org/10.17182/hepdata.134244
or, if you prefer, a specific version of the
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ATLAS
Collaboration
(2023).
Observation of single-top-quark production in association with a photon using the ATLAS detector (Version 1). HEPData (collection).
https://doi.org/10.17182/hepdata.134244.v1
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(2023).
“Fitted fiducial cross sections” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t1
ATLAS
Collaboration
(2023).
“Figure 02” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t2
ATLAS
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(2023).
“Figure 03a” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t3
ATLAS
Collaboration
(2023).
“Figure 03b” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t4
ATLAS
Collaboration
(2023).
“Figure 03c” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t5
ATLAS
Collaboration
(2023).
“Figure Aux 04” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t6
ATLAS
Collaboration
(2023).
“Figure Aux 05a” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t7
ATLAS
Collaboration
(2023).
“Figure Aux 05b” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t8
ATLAS
Collaboration
(2023).
“Figure Aux 05c” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t9
ATLAS
Collaboration
(2023).
“Figure Aux 05d” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t10
ATLAS
Collaboration
(2023).
“Figure Aux 06a” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t11
ATLAS
Collaboration
(2023).
“Figure Aux 06b” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t12
ATLAS
Collaboration
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“Figure Aux 07a” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t13
ATLAS
Collaboration
(2023).
“Figure Aux 07b” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t14
ATLAS
Collaboration
(2023).
“Figure Aux 07c” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t15
ATLAS
Collaboration
(2023).
“Figure Aux 07d” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t16
ATLAS
Collaboration
(2023).
“Figure Aux 08a” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
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ATLAS
Collaboration
(2023).
“Figure Aux 08b” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t18
ATLAS
Collaboration
(2023).
“Figure Aux 08c” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t19
ATLAS
Collaboration
(2023).
“Figure Aux 08d” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t20
ATLAS
Collaboration
(2023).
“Figure Aux 09a” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t21
ATLAS
Collaboration
(2023).
“Figure Aux 09b” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t22
ATLAS
Collaboration
(2023).
“Figure Aux 10a” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t23
ATLAS
Collaboration
(2023).
“Figure Aux 10b” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t24
ATLAS
Collaboration
(2023).
“Table 1” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t25
ATLAS
Collaboration
(2023).
“Table 2” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.134244.v1/t26
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“workspace_partonLevel.json” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (other).
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ATLAS
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(2023).
“workspace_particleLevel.json” of “Observation of single-top-quark production in association with a photon using the ATLAS detector” (Version 1). HEPData (other).
https://doi.org/10.17182/hepdata.134244.v1/r2
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(2023).
Observation of single-top-quark production in association with a photon using the ATLAS detector. Phys.Rev.Lett. 131 (2023) 181901.
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