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 𝑡⁢𝑊 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 𝜎𝑡⁢𝑊=7⁢5+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 𝑊⁢𝑡⁢𝑏 vertex times the Cabibbo-Kobayashi-Maskawa matrix element |𝑓LV⁢𝑉𝑡⁢𝑏| 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 𝑡⁢𝑊 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 𝜎𝑡⁢𝑊=7⁢5+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 𝑊⁢𝑡⁢𝑏 vertex times the Cabibbo-Kobayashi-Maskawa matrix element |𝑓LV⁢𝑉𝑡⁢𝑏| of 0.97±0.10.
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
Settore IMIS-01/B - Misure elettriche ed elettroniche
17-ott-2024
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.110.072010
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1114428
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