Measurement of single top-quark production in the s-channel in proton$-$proton collisions at $\mathrm{\sqrt{s}=13}$ TeV with the ATLAS detector

The ATLAS collaboration
JHEP 06 (2023) 191, 2023.

Abstract (data abstract)
A measurement of single top-quark production in the s-channel is performed in proton--proton collisions at a centre-of-mass energy of $13$ TeV with the ATLAS detector at the CERN Large Hadron Collider. The dataset corresponds to an integrated luminosity of 139 fb$^{-1}$. The analysis is performed on events with an electron or muon, missing transverse momentum and exactly two $b$-tagged jets in the final state. A discriminant based on matrix element calculations is used to separate single top-quark s-channel events from the main background contributions, which are top-quark pair production and $W$-boson production in association with jets. The observed (expected) signal significance over the background-only hypothesis is 3.3 (3.9) standard deviations, and the measured cross-section is $\sigma=8.2^{+3.5}_{-2.9}$ pb, consistent with the Standard Model prediction of $\sigma^{\mathrm{SM}}=10.32^{+0.40}_{-0.36}$ pb.

  • Cross-section measurement

    Result of the measurement

    10.17182/hepdata.133620.v1/t1

    Result of the s-channel single-top cross-section measurement, in pb. The statistical and systematic uncertainties are given, as well as the...

  • Figure 2a

    Data from Figure 2a

    10.17182/hepdata.133620.v1/t2

    Distribution of ${E}_{T}^{miss}$ after the fit of the multijet backgrounds, in the electron channel, in the signal region, without applying...

  • Figure 2b

    Data from Figure 2b

    10.17182/hepdata.133620.v1/t3

    Distribution of ${E}_{T}^{miss}$ after the fit of the multijet backgrounds, in the electron channel, in the $W$+jets VR, without applying...

  • Figure 2c

    Data from Figure 2c

    10.17182/hepdata.133620.v1/t4

    Distribution of ${E}_{T}^{miss}$ after the fit of the multijet backgrounds, in the electron channel, in the $t\bar{t}$ 3-jets VR, without...

  • Figure 2d

    Data from Figure 2d

    10.17182/hepdata.133620.v1/t5

    Distribution of ${E}_{T}^{miss}$ after the fit of the multijet backgrounds, in the electron channel, in the $t\bar{t}$ 4-jets VR, without...

  • Figure 3a

    Data from Figure 3a

    10.17182/hepdata.133620.v1/t6

    Distribution of $m_{T}^{W}$ after the fit of the multijet backgrounds, in the muon channel, in the signal region, without applying...

  • Figure 3b

    Data from Figure 3b

    10.17182/hepdata.133620.v1/t7

    Distribution of $m_{T}^{W}$ after the fit of the multijet backgrounds, in the muon channel, in the $W$+jets VR, without applying...

  • Figure 3c

    Data from Figure 3c

    10.17182/hepdata.133620.v1/t8

    Distribution of $m_{T}^{W}$ after the fit of the multijet backgrounds, in the muon channel, in the $t\bar{t}$ 3-jets VR, without...

  • Figure 3d

    Data from Figure 3d

    10.17182/hepdata.133620.v1/t9

    Distribution of $m_{T}^{W}$ after the fit of the multijet backgrounds, in the muon channel, in the $t\bar{t}$ 4-jets VR, without...

  • Figure 4

    Data from Figure 4

    10.17182/hepdata.133620.v1/t10

    Expected distributions of the MEM discriminant $P(S|X)$ in the SR, for the s-channel single-top signal, and for the $t\bar{t}$ and...

  • Figure 5a

    Data from Figure 5a

    10.17182/hepdata.133620.v1/t11

    Distribution of the MEM discriminant $P(S|X)$ in the $W$+jets VR. Simulated events are normalised to the expected number of events...

  • Figure 5b

    Data from Figure 5b

    10.17182/hepdata.133620.v1/t12

    Distribution of the MEM discriminant $P(S|X)$ in the $t\bar{t}$ 3-jets VR. Simulated events are normalised to the expected number of...

  • Figure 5c

    Data from Figure 5c

    10.17182/hepdata.133620.v1/t13

    Distribution of the MEM discriminant $P(S|X)$ in the $t\bar{t}$ 4-jets VR. Simulated events are normalised to the expected number of...

  • Figure 6a

    Data from Figure 6a

    10.17182/hepdata.133620.v1/t14

    Distribution of the MEM discriminant $P(S|X)$ in the SR before the fit to data, for MEM discriminant values larger than...

  • Figure 6b

    Data from Figure 6b

    10.17182/hepdata.133620.v1/t15

    Distribution of the MEM discriminant $P(S|X)$ in the SR after the fit to data, for MEM discriminant values larger than...

  • Figure 7

    Data from Figure 7

    10.17182/hepdata.133620.v1/t16

    Distribution of the MEM discriminant $P(S|X)$ in the SR after the fit to data, for MEM discriminant values larger than...

  • Table 1

    Data from Table 1

    10.17182/hepdata.133620.v1/t17

    Pre-fit and post-fit event yields in the SR, for MEM discriminant values larger than $2.0\times10^{-4}$. The central value of the...

  • Table 2, summary

    Data from Table 2

    10.17182/hepdata.133620.v1/t18

    Observed impact of the different sources of uncertainty on the measured s-channel signal cross-section, grouped by categories. The impact of...

  • Table 2, $t\bar{t}$ modelling

    Data from Table 2

    10.17182/hepdata.133620.v1/t19

    Observed impact of the different sources of $t\bar{t}$ modelling uncertainty on the measured s-channel signal cross-section. The impact of each...

  • Table 2, s-channel modelling

    Data from Table 2

    10.17182/hepdata.133620.v1/t20

    Observed impact of the different sources of s-channel modelling uncertainty on the measured s-channel signal cross-section. The impact of each...

  • Table 2, t-channel modelling

    Data from Table 2

    10.17182/hepdata.133620.v1/t21

    Observed impact of the different sources of t-channel modelling uncertainty on the measured s-channel signal cross-section. The impact of each...

  • Table 2, $tW$ modelling

    Data from Table 2

    10.17182/hepdata.133620.v1/t22

    Observed impact of the different sources of $tW$ modelling uncertainty on the measured s-channel signal cross-section, grouped by categories. The...

  • Table 2, PDFs

    Data from Table 2

    10.17182/hepdata.133620.v1/t23

    Observed impact of the different sources of PDF uncertainties on the measured s-channel signal cross-section, grouped by categories. The impact...

  • Figure 1a aux

    Data from Figure 1a of the auxilliary material

    10.17182/hepdata.133620.v1/t24

    Comparison between data and prediction after the fit to data in the signal region for the leading-jet $p_{T}$. The last...

  • Figure 1b aux

    Data from Figure 1b of the auxilliary material

    10.17182/hepdata.133620.v1/t25

    Comparison between data and prediction after the fit to data in the signal region for the leading-jet $\eta$. The uncertainty...

  • Figure 1c aux

    Data from Figure 1c of the auxilliary material

    10.17182/hepdata.133620.v1/t26

    Comparison between data and prediction after the fit to data in the signal region for the subleading-jet $p_{T}$. The last...

  • Figure 1d aux

    Data from Figure 1d of the auxilliary material

    10.17182/hepdata.133620.v1/t27

    Comparison between data and prediction after the fit to data in the signal region for the subleading-jet $\eta$. The uncertainty...

  • Figure 2a aux

    Data from Figure 2a of the auxilliary material

    10.17182/hepdata.133620.v1/t28

    Comparison between data and prediction after the fit to data in the signal region for the lepton $p_{T}$. The last...

  • Figure 2b aux

    Data from Figure 2b of the auxilliary material

    10.17182/hepdata.133620.v1/t29

    Comparison between data and prediction after the fit to data in the signal region for the lepton $\eta$. The uncertainty...

  • Figure 2c aux

    Data from Figure 2c of the auxilliary material

    10.17182/hepdata.133620.v1/t30

    Comparison between data and prediction after the fit to data in the signal region for the ${E}_{T}^{miss}$. The last bin...

  • Figure 2d aux

    Data from Figure 2d of the auxilliary material

    10.17182/hepdata.133620.v1/t31

    Comparison between data and prediction after the fit to data in the signal region for the $m_{T}^{W}$. The last bin...

  • Figure 3 aux

    Data from Figure 3 of the auxilliary material

    10.17182/hepdata.133620.v1/t32

    Nuisance parameters ranked according to their post-fit impacts on the best-fit value of the ratio $\mu$ of the measured cross-section...

  • Figure 4 aux

    Data from Figure 4 or the auxilliary material

    10.17182/hepdata.133620.v1/t33

    Correlation matrix of the nuisance parameters and of the ratio $\mu$ of the measured cross-section to the predicted cross-section. The...

  • Pseudo-data replicas

    Additional information

    10.17182/hepdata.133620.v1/t34

    Distribution of the MEM discriminant $P(S|X)$ in the SR for MEM discriminant values larger than $2.0\times10^{-4}$, for the collision data...

  • Statistical-only fits to pseudo-data replicas

    Additional information

    10.17182/hepdata.133620.v1/t35

    Measured values of the signal cross-section and of the $t\bar{t}$ and $W$+jets normalisation factors, obtained by statistical-only fits to the...

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