Measurement of single top-quark production in the s-channel in protonproton collisions at 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 fb1. 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 σ=8.22.9+3.5 pb, consistent with the Standard Model prediction of σSM=10.320.36+0.40 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 ETmiss 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 ETmiss 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 ETmiss after the fit of the multijet backgrounds, in the electron channel, in the tt¯ 3-jets VR, without...

  • Figure 2d

    Data from Figure 2d

    10.17182/hepdata.133620.v1/t5

    Distribution of ETmiss after the fit of the multijet backgrounds, in the electron channel, in the tt¯ 4-jets VR, without...

  • Figure 3a

    Data from Figure 3a

    10.17182/hepdata.133620.v1/t6

    Distribution of mTW 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 mTW 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 mTW after the fit of the multijet backgrounds, in the muon channel, in the tt¯ 3-jets VR, without...

  • Figure 3d

    Data from Figure 3d

    10.17182/hepdata.133620.v1/t9

    Distribution of mTW after the fit of the multijet backgrounds, in the muon channel, in the tt¯ 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 tt¯ 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 tt¯ 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 tt¯ 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 2.0×104. 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, tt¯ modelling

    Data from Table 2

    10.17182/hepdata.133620.v1/t19

    Observed impact of the different sources of tt¯ 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 pT. 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 η. 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 pT. 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 η. 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 pT. 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 η. 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 ETmiss. 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 mTW. 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 μ 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 μ 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 2.0×104, 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 tt¯ and W+jets normalisation factors, obtained by statistical-only fits to the...

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