arXiv 1609.048682016-09-15hep-phnucl-th

LHC的Psi（2S）生产

Psi(2S) Production at the LHC

Xiaojian Du, Ralf Rapp

备注：: 4 pages, 4 figures; Proceeding on Strangeness in Quark Matter 2016 (Berkeley, CA, USA), June 27-July 1, 2016
DOI：: 10.1088/1742-6596/779/1/012042

摘要：

我们计算了在LHC上Pb-Pb碰撞中$ψ(2S)$的产生及其核修饰因子（$R_{\rm AA}$）与$J/ψ$的相应比值。基于温度依赖的反应速率的传输模型，一个连续的再生模式出现：较大的$ψ(2S)$宽度，相对于$J/ψ$，周围和低于临界温度，意味着大多数的$ψ(2S)$状态再生后的火球的演变。这对于再生的charmonia的横向动量（$p_T$）光谱具有明显的后果。虽然$ψ(2S)$介子的总产额仍然小于$J/ψ$的总产额，但它们更硬的$p_T$光谱可以产生高于1的双倍比，用于$p_T>3$ GeV切割，正如CMS合作所应用的那样。在我们的计算中的一个显着的不确定性是与温度的值，其中大部分的$ψ(2S)$再生发生，其非弹性宽度的定量温度依赖性。

英文摘要：

We calculate the production of $ψ(2S)$ and the pertinent double ratio of its nuclear modification factor ($R_{\rm AA}$) over that of the $J/ψ$ in Pb-Pb collisions at the LHC. Based on a transport model with temperature dependent reaction rates, a sequential regeneration pattern emerges: the larger $ψ(2S)$ width, relative to the $J/ψ$, around and below the critical temperature, implies that most of the $ψ(2S)$ states are regenerated later in the evolution of the fireball. This has noticeable consequences for the transverse-momentum ($p_T$) spectra of the regenerated charmonia. While the total yield of $ψ(2S)$ meson remains smaller than those of $J/ψ$'s, their harder $p_T$ spectra can produce a double ratio above unity for a $p_T>3$GeV cut, as applied by the CMS collaboration. A significant uncertainty in our calculations is associated with the values of the temperature where most of the $ψ(2S)$ regeneration occurs, the quantitative temperature dependence of its inelastic width.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

相关论文