arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0901.2371hep-ex
收藏

强子谱-多夸克态

Hadronic Spectrum - Multiquark States

Stephen L. Olsen

摘要:

许多新发现的介子表现得像$\ccbar$粲偶素态,它们优先衰变到包含$c$ -和$\bar{c}$ -夸克的终态,但不符合常规$\ccbar$谱中任何未填充能级的预期。越来越多的人怀疑这些状态中至少有一些是{ \it奇异的},{ \it即}。具有比经典组分夸克模型的夸克-反夸克介子更复杂的子结构。这些候选态中的一些具有非零电荷,因此具有最小夸克含量的$\ccbar u\bar{d}$或$\ccbar d\bar{u}$。此外,在$b$ -和$s$ -夸克扇区中也观察到了具有相似性质的态。本文对实验情况作了简要评述。

英文摘要:

Many newly discovered mesons behave like $\ccbar$ charmonium states in that they preferentially decay into final states that contain a $c$- and a $\bar{c}$-quark, but do not fit expectations for any of the unfilled levels of the conventional $\ccbar$ spectrum. There is a growing suspicion that at least some of these states are {\it exotic}, {\it i.e.} have a substructure that is more complex than the quark-antiquark mesons of the classical constituent quark model. Some of these candidate states have a non-zero electric charge and, thus, a minimal quark content of $\ccbar u\bar{d}$ or $\ccbar d\bar{u}$. In addition, states with similar properties have been observed in the $b$- and $s$-quark sectors. In this report, the experimental situation is briefly reviewed.

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。

↑