Pseudoscalar quarkonium+γ production at NLL+NLO accuracy

Hee Sok Chung, June Haak Ee, Daekyoung Kang, U. Rae Kim, Jungil Lee, Xiang Peng Wang

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


We consider the exclusive pseudoscalar heavy-quarkonium (ηb, c) production in association with a photon at future lepton colliders where the collider energies of O(102) GeV are far greater than the quarkonium mass. At these energies, the logarithm of mass to collision energy becomes increasingly large hence its resummation becomes particularly important. By making use of the light-cone-distribution factorization formula, we resum the logarithms up to next-to-leading-logarithmic accuracy (NLL) that corresponds to order-αs accuracy. We combine the resummed result with a known fixed-order result at next-to-leading order (NLO) such that both resummed-logarithmic terms and non-logarithmic terms are included at the same order in αs. This allowed us to provide reliable predictions at accuracies of order αs ranging from relatively low energies near quarkonium mass to the collider energies of O(102) GeV. We also include the leading relativistic corrections resummed at leading-logarithmic accuracy. Our prediction at the Belle energy is comparable with fixed-order predictions in literatures while it shows a large deviation from a recent Belle’s upper limit by about 4 σ. Finally, we make predictions for the energies of future Z - and Higgs factories.

Original languageEnglish
Article number162
JournalJournal of High Energy Physics
Issue number10
Publication statusPublished - 2019 Oct 1


  • QCD Phenomenology

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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