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arXiv 0810.4988hep-ph
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$D_{sJ}(2860)$和$D_{sJ}(2700)$的多夸克描述

A multiquark description of the $D_{sJ}(2860)$ and $D_{sJ}(2700)$

J. Vijande, A. Valcarce, F. Fernandez

摘要:

在一个理论框架内,占所有的开魅介子,包括$D_0^*(2308)$,的$D_{sJ}^*(2317)$和$D_{sJ}(2460)$,我们分析了结构和探索可能的量子数分配的$D_{sJ}(2860)$和$D_{sJ}(2700)$介子的BABAR和Belle合作报告。如果将开魅区视为常规夸克-反夸克态和四-夸克分量的组合,则可以正确描述开魅区。所有的负宇称和$2^+$态都可以仅用$q\bar q$分量来理解,然而,只要包括两个和四个夸克组态之间的混合,对$0^+$和$1^+$介子的描述就得到了改进。我们分析了所有可能的量子数分配的$D_{sJ}(2860)$的$c\bar s$和$cn\bar s\bar n$配置。我们讨论了电磁和强衰变宽度的基本工具,以区分它们所发挥的作用。还分析了BABAR报告的2.7 GeV附近的宽结构。

英文摘要:

Within a theoretical framework that accounts for all open-charm mesons, including the $D_0^*(2308)$, the $D_{sJ}^*(2317)$ and the $D_{sJ}(2460)$, we analyze the structure and explore possible quantum number assignments for the $D_{sJ}(2860)$ and the $D_{sJ}(2700)$ mesons reported by BABAR and Belle Collaborations. The open-charm sector is properly described if considered as a combination of conventional quark-antiquark states and four--quark components. All negative parity and $2^+$ states can be understood in terms only of $q\bar q$ components, however the description of the $0^+$ and $1^+$ mesons is improved whenever the mixing between two-- and four--quarks configurations is included. We analyze all possible quantum number assignments for the $D_{sJ}(2860)$ in terms of both $c\bar s$ and $cn\bar s\bar n$ configurations. We discuss the role played by the electromagnetic and strong decay widths as basic tools to distinguish among them. The broad structure reported by BABAR near 2.7 GeV is also analyzed.

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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