An effective field theory approach to quarkonium at small transverse momentum

Sean Fleming, Yiannis Makris, Thomas Mehen

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


In this work we apply effective field theory (EFT) to observables in quarkonium production and decay that are sensitive to soft gluon radiation, in particular measurements that are sensitive to small transverse momentum. Within the EFT framework we study χQ decay to light quarks followed by the fragmentation of those quarks to light hadrons. We derive a factorization theorem that involves transverse momentum distribution (TMD) fragmentation functions and new quarkonium TMD shape functions. We derive renormalization group equations, both in rapidity and virtuality, which are used to evolve the different terms in the factorization theorem to resum large logarithms. This theoretical framework will provide a systematic treatment of quarkonium production and decay processes in TMD sensitive measurements.

Original languageEnglish (US)
Article number122
JournalJournal of High Energy Physics
Issue number4
StatePublished - Apr 1 2020


  • Effective Field Theories
  • Perturbative QCD
  • Resummation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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