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arXiv 0906.3950hep-ph
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$K^-p\toΛπ^+π^-$反应旧数据中$Σ^{*}$与PDMATHAAB新共振的证据

Evidence for a new $Σ^{*}$ resonance with $J^P=1/2^-$ in the old data of $K^-p\toΛπ^+π^-$ reaction

Jia-Jun Wu, S. Dulat, B. S. Zou

摘要:

对于自旋宇称为$J^P=1/2^-$的最低SU(3)重子九重态,用猝灭夸克模型和非猝灭夸克模型预言了不同的模式.猝灭夸克模型预测最低的$1/2^-$ $Σ^*$共振在1600 MeV以上,而非猝灭夸克模型预测它在$Σ^*(1385)$能量附近。在这里,我们重新检查了一些旧的数据的$\kp \to \la$反应,并发现,除了建立良好的$Σ^{*}(1385)$与$J^P=3/2^+$,确实有一些证据表明,可能存在一个新的$Σ^{*}$共振与$J^P=1/2^-$在相同的质量,但具有更广泛的衰变宽度。需要更多的相关反应的统计数据来澄清这种情况。

英文摘要:

Distinctive patterns are predicted by quenched quark models and unquenched quark models for the lowest SU(3) baryon nonet with spin parity $J^P=1/2^-$. While the quenched quark models predict the lowest $1/2^-$ $Σ^*$ resonance to be above 1600 MeV, the unquenched quark models predict it to be around $Σ^*(1385)$ energy. Here we re-examine some old data of the $\kp \to \la$ reaction and find that besides the well established $Σ^{*}(1385)$ with $J^P=3/2^+$, there is indeed some evidence for the possible existence of a new $Σ^{*}$ resonance with $J^P=1/2^-$ around the same mass but with broader decay width. Higher statistic data on relevant reactions are needed to clarify the situation.

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