Photoproduction of η c , b near threshold

Liu, Wei-Yang; Zahed, Ismail

doi:10.1103/PhysRevD.110.054025

Title: Photoproduction of $η_{c, b}$ near threshold

Journal Article · 20 September 2024 · Physical Review. D.

DOI: https://doi.org/10.1103/PhysRevD.110.054025 · OSTI ID:2447525

; Zahed, Ismail

We analyze the photoproduction of $η_{c, b}$ off a proton in the threshold region, in terms of C-odd gluonic correlations in the off-forward proton matrix element. Near threshold, the skewness is large, leading to a production amplitude that is dominated by four C-odd twist-3 gluon GPDs. We use the QCD instanton vacuum to estimate these C-odd contributions in the proton. The results are used to estimate the differential cross sections for coherent photoproduction of $η_{c, b}$ in the threshold region, at current electron facilities. Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0023646

OSTI ID:: 2447525

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 5 Vol. 110; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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