Diquarks in nonaquark states
Diquarks in nonaquark states
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非水夸克态的双夸克
DOI：
10.1103/physrevd.72.034014
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发表时间：
2005-06
影响因子：
5
通讯作者：
Mu-Lin Yan,
中科院分区：
文献类型：
--
作者：
Gui-Jun Ding;Mu-Lin Yan,
我们研究了由[T]报道的非夸克态S{sup 0}（3115）和S{sup +}（3140）。铃木，物理学家列托人。B 597, 236 (2004) m。Iwasaki et al.，核子-ex/0310018]，利用具有双夸克相关的夸克模型。非夸克态形成1,8,10,10,27,35 SU(3)多重态。利用标准张量技术构造了所有非夸克态的风味波函数。用Gell-Mann-Okubo质量公式研究了质谱。得到了一些非夸克质量和规则。我们进一步研究了S{sup 0}（3115）和S{sup +}（3140）在“分崩离析”机制假设下的衰变。发现主要的衰减模式是{sigma}NN而不是{lambda}NN，这与实验结果一致。我们还唯一确定了S{sup 0}（3115）的风味波函数，它属于量子数Y=2，I=1,I{sub z}=-1的27重态。而奇异态S{sup +}（3140）既可以属于27重态也可以属于35重态。在精确的SU(3){sup flavor}xSU(3){sup color}xSU(2){sup spin}极限下，S{sup 0}（3115）和S{sup +}（3140）都属于负宇称的27重子。我们预测其风味结构可以通过测量其衰变通道的分支分数来确定。验证这一预测的实验如预期的那样。
We study the nonaquark states S{sup 0}(3115) and S{sup +}(3140) which are reported by [T. Suzuki (KEK-PS), Phys. Lett. B 597, 236 (2004)M. Iwasaki et al., nucl-ex/0310018] by means of the quark model with diquark correlation. The nonaquark states form 1,8,10,10,27,35 SU(3) multiplets. The flavor wave functions of all the nonaquark states are constructed through the standard tensor technique. The mass spectrum is studied by using the Gell-Mann-Okubo mass formula. Some nonaquark mass sum rules are obtained. We further investigate the decay of S{sup 0}(3115) and S{sup +}(3140) under the assumption of the ''fall-apart'' mechanism. It has been found that the main decay mode is {sigma}NN rather than {lambda}NN which is consistent with experiment. Also we have uniquely determined the flavor wave function of S{sup 0}(3115) which belongs to the 27-plet with the quantum number Y=2,I=1,I{sub z}=-1. Whereas the exotic states S{sup +}(3140) can belong to either the 27-plet or the 35-plet. In the exact SU(3){sup flavor}xSU(3){sup color}xSU(2){sup spin} limit, both S{sup 0}(3115) and S{sup +}(3140) belong to the 27-plet with negative parity. We predict that its flavor structure can be determined by measuring the branch fractions of its decay channels. The experiments to check this prediction are as expected.
影响因子：
14.9
作者：
F. Close
通讯作者：
F. Close