标题： K介子光致产中的缺失核子共振证据 显示英文标题

标题： Evidence for a missing nucleon resonance in kaon photoproduction

摘要： 新的SAPHIR p(γ,K+)Λ总截面数据在质心能量约为1900 MeV处显示出一个共振结构。我们使用一个盒模型来研究这一特征，并发现通过在1895 MeV处包含一个新的D_{13}共振可以很好地解释该结构。这种状态已经被相对论夸克模型预测，在1960 MeV处具有显著的γ-N和K-Λ分支比。我们演示了如何利用光子不对称性的测量来进一步研究这个共振。此外，验证预测的进入eta-N和eta'-N通道的大衰变宽度将有助于区分其他附近的D_{13}状态。 显示英文摘要

摘要： 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 the photon asymmetry can be used to further study this resonance. In addition, verification of the predicted large decay widths into the eta-N and eta'-N channels would allow distinguishing between other nearby D_{13} states.