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The production of doubly charmed exotic hadrons in heavy ion collisions

Aug 11, 2022, 9:55 AM
Oral report 强子物理与味物理 Parallel Session VII (2):Hadron and Flavor Physics


辉 张 (South China Normal University)


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.

Primary author

辉 张 (South China Normal University)


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

Presentation materials