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arXiv 1412.5378hep-phnucl-th
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由涉及$D$和$D^*$介子的反应产生$X(3872)$

$X(3872)$ production from reactions involving $D$ and $D^*$ mesons

A. Martinez Torres, K. P. Khemchandani, F. S. Navarra, M. Nielsen, Luciano M. Abreu

摘要:

在这一过程中,我们发现的结果为过程$\bar D D\toπX(3872)$,$\bar D^* D\to πX(3872)$和$\bar D^* D^*\toπX(3872)$,$X(3872)$丰度的重离子碰撞计算所需的信息的横截面。我们的形式是基于从强子$\bar D^0 D^{*0} - \textrm{c.c}$,$D^- D^{*+} - \textrm{c.c}$和$D^-_s D^{*+}_s - \textrm{c.c}$的相互作用产生的$X(3872)$。与具有$D^*$介子的过程相关的截面的评估涉及异常顶点$X\bar D^* D^*$,我们通过考虑$X(3872)$的分子性质所激发的三角形环来确定。我们发现这个顶点的贡献是重要的。受这一发现的鼓舞,我们估计了$X\bar D^* D^*$耦合,结果是$1.95\pm 0.22$。然后,我们使用它来获得反应$\bar D^* D^*\toπX$的横截面,并发现$X\bar D^* D^*$顶点在这种情况下也是相关的。我们还讨论了$X$的带电组分在确定的生产截面的作用。

英文摘要:

In this proceeding we show the results found for the cross sections of the processes $\bar D D\toπX(3872)$, $\bar D^* D\to πX(3872)$ and $\bar D^* D^*\toπX(3872)$, information needed for calculations of the $X(3872)$ abundance in heavy ion collisions. Our formalism is based on the generation of $X(3872)$ from the interaction of the hadrons $\bar D^0 D^{*0} - \textrm{c.c}$, $D^- D^{*+} - \textrm{c.c}$ and $D^-_s D^{*+}_s - \textrm{c.c}$. The evaluation of the cross section associated with processes having $D^*$ meson(s) involves an anomalous vertex, $X\bar D^* D^*$, which we have determined by considering triangular loops motivated by the molecular nature of $X(3872)$. We find that the contribution of this vertex is important. Encouraged by this finding we estimate the $X\bar D^* D^*$ coupling, which turns out to be $1.95\pm 0.22$. We then use it to obtain the cross section for the reaction $\bar D^* D^*\toπX$ and find that the $X\bar D^* D^*$ vertex is also relevant in this case. We also discuss the role of the charged components of $X$ in the determination of the production cross sections.

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。

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