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Extracting the Top-Quark Width from Nonresonant Production


Herwig, Christian; Ježo, Tomáš; Nachman, Benjamin (2019). Extracting the Top-Quark Width from Nonresonant Production. Physical Review Letters, 122(23):231803.

Abstract

In the context of the standard model of particle physics, the relationship between the top-quark mass and width (Γt) has been precisely calculated. However, the uncertainty from current direct measurements of the width is nearly 50%. A new approach for directly measuring the top-quark width using events away from the resonance peak is presented. By using an orthogonal dataset to traditional top-quark width extractions, this new method may enable significant improvements in the experimental sensitivity in a method combination. Recasting a recent ATLAS differential cross section measurement, we find Γt=1.28±0.30  GeV (1.33±0.29  GeV expected), providing the most precise direct measurement of the width.

Abstract

In the context of the standard model of particle physics, the relationship between the top-quark mass and width (Γt) has been precisely calculated. However, the uncertainty from current direct measurements of the width is nearly 50%. A new approach for directly measuring the top-quark width using events away from the resonance peak is presented. By using an orthogonal dataset to traditional top-quark width extractions, this new method may enable significant improvements in the experimental sensitivity in a method combination. Recasting a recent ATLAS differential cross section measurement, we find Γt=1.28±0.30  GeV (1.33±0.29  GeV expected), providing the most precise direct measurement of the width.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > General Physics and Astronomy
Uncontrolled Keywords:General Physics and Astronomy
Language:English
Date:14 June 2019
Deposited On:16 Oct 2019 14:13
Last Modified:29 Jul 2020 11:27
Publisher:American Physical Society
ISSN:0031-9007
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1103/physrevlett.122.231803

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