A new resonance in K+Lambda electroproduction: the D_{13}(1895) and its electromagnetic form factors
A new resonance in K+Lambda electroproduction: the D_{13}(1895) and its electromagnetic form factors
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K Lambda 电生产中的新共振：D_{13}(1895) 及其电磁形状因子
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
T. Mart
中科院分区：
文献类型：
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作者：
C. Bennhold;H. Haberzettl;T. Mart
新的SAPHIR p（gamma，K+）Lambda总截面数据显示在总c.m.能量约1900 MeV。我们用等压线模型研究了这一特性，发现在1895 MeV处引入一个新的D_{13}共振可以很好地解释这一结构。这样的状态已被预测的相对论夸克模型在1960 MeV的显着的γ-N和K-λ分支比。我们演示了如何测量的单，双偏振观测值可以用来获得额外的信息，这种共振。使用最近的（e，e 'K+）JLab数据从大厅C，我们提取这种状态的电磁形状因子。
New SAPHIR p(gamma,K+)Lambda total cross section data show a resonance structure at a total c.m. energy around 1900 MeV. We investigate this feature with an isobar model and find that the structure can be well explained by including a new D_{13} resonance at 1895 MeV. Such a state has been predicted by a relativistic quark model at 1960 MeV with significant gamma-N and K-Lambda branching ratios. We demonstrate how the measurement of single and double polarization observables can be used to obtain additional information on this resonance. Using recent (e,e'K+) JLab data from Hall C we extract the electromagnetic form factors of this state.