Abstract
We compute the differential cross-section for direct quarkonium production accompanied by a gluon in high-energy deep inelastic scattering (DIS) at small-x. We employ the Non-Relativistic QCD factorization framework, focusing on the S-wave contribution to the formation of the quarkonium, and including both color singlet and octet contributions. Our short distance coefficients for the production of the heavy quark pair are obtained within the Color Glass Condensate effective field theory. Our results pave the way towards the next-to-leading order computation of direct quarkonium in DIS, as well as the study of azimuthal correlations of direct quarkonium and jet.
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Acknowledgments
We are grateful to Philip Velie for his valuable discussions and contributions at the early stages of this work. Z.K. and F.S. are supported by the National Science Foundation under grant No. PHY1945471. F.S. is also supported by the UC Southern California Hub, with funding from the UC National Laboratories division of the University of California Office of the President, and by the U.S. Department of Energy under Contract No. DE-AC02-05CH11231, by NSF under Grant No. OAC2004571 within the X-SCAPE Collaboration. This work is also supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, within the framework of the Saturated Glue (SURGE) Topical Theory Collaboration.
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Kang, ZB., Li, E. & Salazar, F. Direct quarkonium-plus-gluon production in DIS in the color glass condensate. J. High Energ. Phys. 2024, 27 (2024). https://doi.org/10.1007/JHEP03(2024)027
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DOI: https://doi.org/10.1007/JHEP03(2024)027