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arXiv · 2603.27391

Probe charmonium-nucleon interactions in high energy proton-proton collisions

Jiaxing Zhao·Taesoo Song·Joerg Aichelin·Elena Bratkovskaya·Pol Bernard Gossiaux·Klaus Werner
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Abstract

We investigate charmonium production and the charmonium-nucleon correlation function in pp collisions using the EPOS4+CATS framework. For the first time, the emission source of charmonium-proton pairs is dynamically generated and found to be non-Gaussian. This enables a femtoscopic extraction of the charmonium-proton interaction directly from experimental correlation functions. Both ground and excited charmonium states are included. We find that feed-down from excited charmonium states can induce sizable modifications to the observed prompt $J/\psi$-proton correlation function, even when the correlation deviates from unity by less than one, reflecting the stronger interactions of the excited states.

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Jiaxing Zhao, Taesoo Song, Joerg Aichelin, Elena Bratkovskaya, Pol Bernard Gossiaux, Klaus Werner. 2026-03-28. Probe charmonium-nucleon interactions in high energy proton-proton collisions. https://arxiv.org/abs/2603.27391

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