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May 22 – 26, 2023
IJCLab, Orsay (FRANCE)
Europe/Paris timezone

Probing the odderon through $\eta_c$ production in diffractive collisions at the EIC with non-linear evolution effects.

May 26, 2023, 3:25 PM
Auditorium Joliot Curie (IJCLab, Orsay (FRANCE))

Auditorium Joliot Curie

IJCLab, Orsay (FRANCE)

15, Rue G. Clemenceau 91405 Orsay Cedex FRANCE




The production of $\eta_c$ in diffractive $ep$ and $eA$ collisions has been suggested as a golden probe of the C-odd QCD interaction, the odderon. Previous studies of this process have considered a linearised Bartels-Kwiecinski-Praszalowicz odderon [1-3], which is appropriate in the dilute regime where the x region probed in the proton is not too small. In this work [4], we explore this process in the dense regime, i.e., at low-x values in the proton or in large nuclei where effects of gluon saturation may become important. We treat the energy evolution of the odderon using the running coupling Balitsky-Kovchegov equation which incorporates saturation effects and present numerical estimates for eta_c production in diffractive ep and eA (Au, Cu, Al) at the Electron-Ion Collider (EIC). As the initial condition for odderon evolution, we adopt a Jeon-Venugopalan model [5] based odderon, with the overall normalisation being fixed by a group theoretic constraint [6,7] which gives us an upper bound for the size of the odderon, as well as the cross-section. By studying the dependence of eta_c production on different kinematics and nuclear size, and the relative sizes of the QCD and QED contributions, we aim to identify the ideal scenario to get a signal for the odderon at the EIC.

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2) J. Czyzewski, J. Kwiecinski, L. Motyka, and M. Sadzikowski, Phys. Lett. B 398, 400 (1997)
3) A. Dumitru and T. Stebel, Phys. Rev. D 99, 094038 (2019)
4) S. Benić, D. Horvatić, A. Kaushik, and E. Vivoda, in preparation
5) S. Jeon and R. Venugopalan, Phys. Rev. D 71, 125003 (2005)
6) T. Lappi, A. Ramnath, K. Rummukainen, and H. Weigert, Phys. Rev. D 94, 054014 (2016)
7) N. Kaiser, Journal of Physics A: Mathematical and General 39, 15287 (2006)

Primary authors

ABHIRAM KAUSHIK BADRINARAYANAN Prof. Davor Horvatić (University of Zagreb) Mr Eric Andreas Vivoda (Department of Physics, Faculty of Science, University of Zagreb) Sanjin Benić

Presentation materials