The inclusive cross section for the production of a single top quark in association with a 𝑊 boson is measured using 140 fb−1 of proton-proton collision data collected with the ATLAS detector at √𝑠=13 TeV. Events containing two charged leptons and at least one jet identified as originating from a 𝑏-quark are selected. A multivariate discriminant is constructed to separate the 𝑡𝑊 signal from the 𝑡 ¯ 𝑡 background. The cross section is extracted using a profile likelihood fit to the signal and control regions and it is measured to be 𝜎𝑡𝑊=75+15 −14 pb, in good agreement with the Standard Model prediction. The measured cross section is used to extract a value for the left-handed form factor at the 𝑊𝑡𝑏 vertex times the Cabibbo-Kobayashi-Maskawa matrix element |𝑓LV𝑉𝑡𝑏| of 0.97±0.10.
Measurement of single top-quark production in association with a W boson in pp collisions at √s=13 TeV with the ATLAS detector / G. Aad, E.A.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 110:7(2024 Oct 17), pp. 072010.1-072010.30. [10.1103/physrevd.110.072010]
Measurement of single top-quark production in association with a W boson in pp collisions at √s=13 TeV with the ATLAS detector
A. Andreazza;A. Carbone;L. Carminati;S. D'Auria;L. Dell'Asta;M. Fanti;M. Lazzaroni;E. Mazzeo;C. Meroni;L. Nasella;F. Ragusa;A. Sala;
2024
Abstract
The inclusive cross section for the production of a single top quark in association with a 𝑊 boson is measured using 140 fb−1 of proton-proton collision data collected with the ATLAS detector at √𝑠=13 TeV. Events containing two charged leptons and at least one jet identified as originating from a 𝑏-quark are selected. A multivariate discriminant is constructed to separate the 𝑡𝑊 signal from the 𝑡 ¯ 𝑡 background. The cross section is extracted using a profile likelihood fit to the signal and control regions and it is measured to be 𝜎𝑡𝑊=75+15 −14 pb, in good agreement with the Standard Model prediction. The measured cross section is used to extract a value for the left-handed form factor at the 𝑊𝑡𝑏 vertex times the Cabibbo-Kobayashi-Maskawa matrix element |𝑓LV𝑉𝑡𝑏| of 0.97±0.10.| File | Dimensione | Formato | |
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PhysRevD.110.072010.pdf
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