Exclusive quarkonium production or decay in soft gluon factorization

Abstract

In this paper, we study the application of the recently proposed soft gluon factorization (SGF) to exclusive quarkonium production or decay. We find that in the nonrelativistic QCD factorization framework there are too many nonperturbative parameters. Thanks to the factorization of kinematical physics from dynamical physics, the SGF significantly reduces the number of nonperturbative parameters. Therefore, the SGF can improve our predictive power of exclusive quarkonium production or decay. By applying to ${\eta }_c+\gamma$ production at B-factories, our result is the closest one to data among all theoretical calculations.

arXiv comment13 pages, 1 figure, version published in JHEP

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Cited by in corpus (7)

• Matching next-to-leading-order and high-energy-resummed calculations of heavy-quarkonium-hadroproduction cross sections
• First-principle calculation of ${\eta }_c\to 2\gamma$ decay width from lattice QCD
• Theory for quarkonium: from NRQCD factorization to soft gluon factorization
• Fragmentation function of $g\to Q\bar{Q}{(}^3{S}_1^{[8]})$ in soft gluon factorization and threshold resummation
• Observation of the charmonium decay ${\eta }_c\to \gamma \gamma$ in $J/\psi \to \gamma {\eta }_c$
• Color-octet contributions for $J/\psi$ inclusive production at B factories in soft gluon factorization
• Next-to-leading order analysis of $J/\psi +\gamma$ production in photon-photon collisions at CEPC