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# 中国物理学会高能物理分会第十一届全国会员代表大会暨学术年会

Aug 8 – 12, 2022
Asia/Shanghai timezone

## The production of doubly charmed exotic hadrons in heavy ion collisions

Aug 11, 2022, 9:55 AM
15m
Oral report 强子物理与味物理

### Description

Hadron spectroscopy provides direct physical measurements that shed light on the non-perturbative behavior of quantum chromodynamics (QCD). In particular, various exotic hadrons such as the newly observed $T_{cc}^+$ by the LHCb collaboration, offer unique insights into the QCD dynamics in hadron structures. In this letter, we demonstrate how heavy ion collisions can serve as a powerful venue for hadron spectroscopy study of doubly charmed exotic hadrons by virtue of the extremely charm-rich environment created in such collisions. The yields of $T_{cc}^+$, as well as its potential isospin partners, are computed within the molecular picture for Pb-Pb collisions at center-of-mass energy $2.76~\mathrm{TeV}$. We find about three-order-of-magnitude enhancement in the production of $T_{cc}^+$ in Pb-Pb collisions as compared with the yield in proton-proton collisions, with a moderately smaller enhancement in the yields of the isospin partners $T_{cc}^0$ and $T_{cc}^{++}$. The $T_{cc}^+$ yield is comparable to that of the $X(3872)$ in the most central collisions while showing a considerably stronger decrease toward peripheral collisions, due to a threshold'' effect of the required double charm quarks for $T_{cc}^+$. Final results for their rapidity and transverse momentum $p_T$ dependence as well as the elliptic flow coefficient are reported and can be tested by future experimental measurements.

### Co-authors

Enke Wang (South China Normal University) Hongxi Xing (South China Normal University) Prof. JINFENG LIAO (INDIANA UNIVERSITY &amp; RBRC) Qian Wang (Bonn University)