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Top quark pair production near threshold : single/double distributions and mass determination.

Ju, Wan-Li and Wang, Guoxing and Wang, Xing and Xu, Xiaofeng and Xu, Yongqi and Yang, Li Lin (2020) 'Top quark pair production near threshold : single/double distributions and mass determination.', Journal of high energy physics., 2020 (06). p. 158.

Abstract

We investigate top quark pair production near the threshold where the pair invariant mass Mtt¯ approaches 2mt, which provides sensitive observables to extract the top quark mass mt. Using the effective field theory methods, we derive a factorization and resummation formula for kinematic distributions in the threshold limit up to the next-to- leading power, which resums higher order Coulomb corrections to all orders in the strong coupling constant. Our formula is similar to those in the literature but differs in several important aspects. We apply our formula to the Mtt¯ distribution, as well as to the double differential cross section with respect to Mtt¯ and the rapidity of the tt¯ pair. We find that the resummation effects significantly increase the cross sections near the threshold, and lead to predictions better compatible with experimental data than the fixed-order ones. We demonstrate that incorporating resummation effects in the top quark mass determination can shift the extracted value of mt by as large as 1.4 GeV. The shift is much larger than the estimated uncertainties in previous experimental studies, and leads to a value of the top quark pole mass more consistent with the current world average.

Item Type:Article
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Available under License - Creative Commons Attribution.
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1007/JHEP06(2020)158
Publisher statement:This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
Date accepted:25 May 2020
Date deposited:22 July 2020
Date of first online publication:25 June 2020
Date first made open access:22 July 2020

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