Abstract
We calculate the cross-sections of diffractive single hadron photo- or electroproduction with large pT, on a nucleon or a nucleus in the shockwave formalism. We use the hybrid formalism mixing collinear factorization with high energy small-x factorization with the impact factors computed at next-to-leading order accuracy. We prove the cancellation of divergence and we determine the finite parts of the differential cross-sections. We work in general kinematics such that both photoproduction and leptoproduction are considered. The results can be used to detect saturation effects, at both the future EIC or already at LHC, using Ultra-Peripheral Collisions.
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Acknowledgments
E. L. and S. W. thank Charlotte Van Hulse and Ronan McNulty for early discussions which motivated the present work. We thank Renaud Boussarie, Michel Fontannaz, Saad Nabeebaccus, Maxim A. Nefedov, Alessandro Papa and Farid Salazar for many useful discussions.
This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement STRONG-2020 (WP 13 “NA-Small-x”). The work by M. F. is supported by Agence Nationale de la Recherche under the contract ANR-17-CE31-0019. The work of L. S. is supported by the grant 2019/33/B/ST2/02588 of the National Science Center in Poland. L. S. thanks the P2IO Laboratory of Excellence (Programme Investissements d’Avenir ANR-10-LABEX-0038) and the P2I - Graduate School of Physics of Paris-Saclay University for support. This work was also partly supported by the French CNRS via the GDR QCD.
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Fucilla, M., Grabovsky, A., Li, E. et al. Diffractive single hadron production in a saturation framework at the NLO. J. High Energ. Phys. 2024, 165 (2024). https://doi.org/10.1007/JHEP02(2024)165
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DOI: https://doi.org/10.1007/JHEP02(2024)165