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arXiv 0705.1697nucl-th
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在RHIC上产生$D_{sJ}$(2317)介子

$D_{sJ}$(2317) meson production at RHIC

L. W. Chen, C. M. Ko, W. Liu, M. Nielsen

摘要:

研究了RHIC相对论重离子碰撞中$D_{sJ}$(2317)介子的产生。利用夸克并合模型,我们首先确定了产生的夸克-胶子等离子体强子化过程中产生的$D_{sJ}$(2317)介子的初始数目。预测的$D_{sJ}$(2317)丰度敏感地依赖于$D_{sJ}$(2317)介子的夸克结构。对于常规的二夸克介子,得到的产额比奇异的四夸克$D_{sJ}$(2317)介子大一个数量级。为了考虑强子效应对$D_{sJ}$(2317)介子产额的影响,我们在唯象强子模型中计算了$D_{sJ}$(2317)介子对π介子、ρ介子、反K介子和矢量反K介子的吸收截面。考虑到$D_{sJ}$(2317)介子在重离子碰撞强子阶段的吸收和产生,通过动力学模型,我们发现$D_{sJ}$(2317)介子的最终产额对由夸克-胶子等离子体产生的初始介子数仍然敏感,从而为研究相对论重离子碰撞中$D_{sJ}$(2317)介子的夸克结构及其产生机制提供了可能。

英文摘要:

Production of $D_{sJ}$(2317) mesons in relativistic heavy ion collisions at RHIC is studied. Using the quark coalescence model, we first determine the initial number of $D_{sJ}$(2317) mesons produced during hadronization of created quark-gluon plasma. The predicted $D_{sJ}$(2317) abundance depends sensitively on the quark structure of the $D_{sJ}$(2317) meson. An order-of-magnitude larger yield is obtained for a conventional two-quark than for an exotic four-quark $D_{sJ}$(2317) meson. To include the hadronic effect on the $D_{sJ}$(2317) meson yield, we have evaluated the absorption cross sections of the $D_{sJ}$(2317) meson by pion, rho, anti-kaon, and vector anti-kaon in a phenomenological hadronic model. Taking into consideration the absorption and production of $D_{sJ}$(2317) mesons during the hadronic stage of heavy ion collisions via a kinetic model, we find that the final yield of $D_{sJ}$(2317) mesons remains sensitive to its initial number produced from the quark-gluon plasma, providing thus the possibility of studying the quark structure of the $D_{sJ}$(2317) meson and its production mechanism in relativistic heavy ion collisions.

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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