Strong IR cancellation in heavy quarkonium and precise top mass determination

Y. Kiyo, G. Mishima, Y. Sumino

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Combining recent perturbative analyses on the static QCD potential and the quark pole mass, we find that, for the heavy quarkonium states cc¯(1) ultra-soft (US) corrections in the binding energies are small, and (2) there is a stronger cancellation of IR contributions than what has been predicted by renormalon dominance hypothesis. By contrast, for a hypothetical heavy quarkonium system with a small number of active quark flavors (nl ≈ 0), we observe evidence that renormalon dominance holds accurately and that non-negligible contributions from US corrections exist. In addition, we examine contributions of renormalons at u = −1. As an important consequence, we improve on a previous prediction for possible achievable accuracy of top quark MS¯-mass measurement at a future linear collider and estimate that in principle 20-30 MeV accuracy is reachable.

Original languageEnglish
Article number84
Pages (from-to)1-19
Number of pages19
JournalJournal of High Energy Physics
Volume2015
Issue number11
DOIs
Publication statusPublished - 2015 Nov 1

Keywords

  • QCD Phenomenology

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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