Medium-Assisted Enhancement of $X(3872)$ Production from Small to Large Colliding Systems

TL;DR

This paper introduces a medium-assisted mechanism explaining the non-monotonic production pattern of the exotic hadron $ ext{X}(3872)$ across different collision systems, supported by simulations matching experimental data.

Contribution

It proposes a novel medium-assisted enhancement mechanism for $ ext{X}(3872)$ production, competing with suppression effects, and provides quantitative predictions for various collision systems.

Findings

Model reproduces existing experimental data.

Predicts non-monotonic production trends in future collisions.

Highlights the role of medium effects in exotic hadron production.

Abstract

Studies of exotic hadrons such as the $\chi_{c1} (3872)$ state provide crucial insights into the fundamental force governing the strong interaction dynamics, with an emerging new frontier to investigate their production in high energy collisions where a partonic medium is present. Latest experimental measurements from the Large Hadron Collider show an intriguing evolution pattern of the $\chi_{c1} (3872)$-to-$\psi(2S)$ yield ratio from proton-proton collisions with increasing multiplicities toward proton-lead and lead-lead collisions. Here we propose a novel mechanism of medium-assisted enhancement for the $\chi_{c1} (3872)$ production, which competes with the more conventional absorption-induced suppression and results in a non-monotonic trend from small to large colliding systems. Realistic simulations from this model offer the first quantitative description of all available data. Predictions are made for the centrality dependence of this observable in PbPb collisions as well as for its system size dependence from OO and ArAr to XeXe and PbPb collisions. In both cases, a non-monotonic behavior emerges as the imprint of the competition between enhancement and suppression and can be readily tested by future data.