Coupled-channel analysis of KΣ production on the nucleon up to 2.0 GeV
Coupled-channel analysis of KΣ production on the nucleon up to 2.0 GeV
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DOI：
10.1103/physrevc.88.055204
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发表时间：
2013-03
影响因子：
3.1
通讯作者：
Xu Cao;V. Shklyar;H. Lenske
中科院分区：
文献类型：
--
作者：
Xu Cao;V. Shklyar;H. Lenske
采用考虑么正不变性和规范不变性的耦合通道有效拉格朗日模型，对质心能量高达2GeV的(pi，Gamma)N到KSigma反应进行了联合分析。最近由Clas、CBELSA、LEPS和Graal小组获得的光产生数据被包括在我们的计算中，目的是将共振耦合提取到$K\Sigma$状态。研究发现，共振和背景贡献对于重现角分布和偏振观测的正确形状都很重要。我们对数据的描述质量很好。详细讨论了同位旋$i=3/2$共振的提取性质，而$i=1/2$共振在很大程度上是由非奇异通道决定的。
A coupled-channel effective Lagrangian model respecting unitary and gauge invariance is applied to the combined analysis of the $(\pi,\gamma) N \to K\Sigma$ reactions for the center of mass energies up to 2 GeV. The recent photoproduction data obtained by the CLAS, CBELSA, LEPS, and GRAAL groups are included into our calculations with the aim to extract the resonance couplings to the $K\Sigma$ state. Both resonances and background contributions are found to be important to reproduce a correct shape of the angular distributions and polarization observables. Our description to the data is of good quality. The extracted properties of isospin $I = 3/2$ resonances are discussed in detail while the $I = 1/2$ resonances are largely determined by the non-strangeness channels.