Inclusive J/ψ and ηc production in ϒ decay at O(αs5) in nonrelativistic QCD factorization

He, Zhi-Guo; Kniehl, Bernd A.; Wang, Xiang-Peng

doi:10.1103/physrevd.101.074002

Title: Inclusive J/ψ and ηc production in ϒ decay at O(αs5) in nonrelativistic QCD factorization

Journal Article · Thu Apr 02 00:00:00 EDT 2020 · Physical Review. D.

DOI:https://doi.org/10.1103/physrevd.101.074002· OSTI ID:1608074

He, Zhi-Guo;

; Wang, Xiang-Peng

Here, we study $J / ψ$ and $η_{c}$ inclusive production in $Υ$ decay within the framework of nonrelativistic-QCD (NRQCD) factorization. In the latter case, for which no experimental data exist so far, we also include the $h_{c}$ feed-down contribution. We calculate the short-distance coefficients completely through $O (α_{s}^{5})$ . The NRQCD predictions for the branching fraction $B (Υ \to J / ψ + X)$ via direct production, evaluated with different sets of long-distance matrix elements (LDMEs), all agree with the experimental data in a reasonable range of renormalization scale. Using $η_{c}$ and $h_{c}$ LDMEs obtained from $J / ψ$ and $χ_{c}$ ones via heavy-quark spin symmetry, we find that the bulk of $B (Υ \to η_{c} + X)$ via prompt production arises from the $c \bar{c} ({{}_{3}S}_{1}^{[8]})$ Fock state. The experimental study of this decay process would, therefore, provide a particularly clean probe of the color octet mechanism of heavy-quarkonium production.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); German Federal Ministry of Education and Research (BMBF); German Research Foundation (DFG); Chinese Scholarship Council

Grant/Contract Number:: AC02-06CH11357; 05H15GUCC1; KN-365/12-1; CSC-201404910576

OSTI ID:: 1608074

Alternate ID(s):: OSTI ID: 1756089

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Vol. 101 Journal Issue: 7; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 1 work

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