论文标题
双子碰撞中双重迷人状态的多重性$ t_ {cc} ^+$
Multiplicity of the doubly charmed state $T_{cc} ^+$ in heavy-ion collisions
论文作者
论文摘要
我们研究了在重型离子碰撞后期产生的热强子气体中，双重诱人的状态$ t_ {cc}^+$的演变。我们使用有效的拉格朗日人来计算$ t_ {cc}^+ $生产的热平均横截面，例如$ d^{（*）} d^{（*）} \ rightArrow t_ {cc}^+ wish+ rightARROW t_ {cc}^+π，然后，我们求解速率方程，以遵循$ t_ {cc}^+$多重性的时间演变，并确定在扩展HADRONIC MATESS期间如何影响其受考虑的反应的影响。我们比较了$ t_ {cc}^+$丰度的演变，被视为HADRONIC $ S $ - 波分子和Tetraquark State。我们的结果表明，在冷冻输出时，四夸克产率增加了约2倍，但它仍然比由强调结合形成的分子的最终产量小一个数量级。另外，结果表明在类似条件下，$ n_ {t_ {t_ {cc}} $比$ n_ {x（3872）} $更受HADRONIC培养基的交互影响。我们还表明，产量非常弱取决于系统大小，以$ \ MATHCAL {n} = \ left [d n_ {ch} /dη（η<0.5）\ right]^{1/3} $表示。
We study the evolution of the doubly charmed state $T_{cc}^+$ in a hot hadron gas produced in the late stage of heavy-ion collisions. We use effective Lagrangians to calculate the thermally averaged cross sections of $T_{cc}^+$ production in reactions such as $ D^{(*)} D^{(*)} \rightarrow T_{cc}^+ π, T_{cc}^+ ρ$ and its absorption in the corresponding inverse processes. We then solve the rate equation to follow the time evolution of the $T_{cc}^+$ multiplicity, and determine how it is affected by the considered reactions during the expansion of the hadronic matter. We compare the evolution of the $T_{cc}^+$ abundance treated as a hadronic $S$-wave molecule and as a tetraquark state. Our results show that the tetraquark yield increases by a factor of about 2 at freeze-out, but it is still one order of magnitude smaller than the final yield of molecules formed from hadron coalescence. Also, the results indicate that $N_{T_{cc}}$ is more affected by interactions with hadronic medium than $ N_{X(3872)} $ in similar conditions. We also show that yields depend very weakly on the system size, represented by $\mathcal{N} = \left[ d N_{ch} / d η(η< 0.5)\right]^{1/3}$.
