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Invariant-mass distribution of top-quark pairs and top-quark mass determination.

Ju, Wan-Li and Wang, Guoxing and Wang, Xing and Xu, Xiaofeng and Xu, Yongqi and Yang, Li Lin (2020) 'Invariant-mass distribution of top-quark pairs and top-quark mass determination.', Chinese physics C., 44 (9). 091001.


In this study, we investigate the invariant-mass distribution of top-quark pairs near the 2mt threshold, which strongly influences the determination of the top-quark mass mt. Higher-order non-relativistic corrections lead to large contributions, which are not included in the state-of-the-art theoretical predictions. A factorization formula is derived to resum such corrections to all orders in the strong-coupling, and necessary ingredients are calculated to perform the resummation at next-to-leading power. We combine the resummation with fixed-order results and present phenomenologically relevant numerical results. The resummation effect significantly increases the differential cross-section in the threshold region and makes the theoretical prediction more compatible with experimental data. We estimate that using our prediction in the determination of mt will lead to a value closer to the direct measurement result.

Item Type:Article
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Publisher statement:Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.
Date accepted:No date available
Date deposited:29 October 2020
Date of first online publication:17 July 2020
Date first made open access:29 October 2020

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