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首页> 外文期刊>Physical review, C >Role of a triangle singularity in the pi N(1535) contribution to gamma p -> p pi(0) eta
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Role of a triangle singularity in the pi N(1535) contribution to gamma p -> p pi(0) eta

机译:三角形奇异性在PI n(1535)对γp - > p pi(0)eta的贡献中的作用

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We have studied the gamma p -> p pi(0) eta reaction paying attention to the two main mechanisms at low energies, the gamma p ->Delta(1700) -> eta Delta(1232) and the gamma p -> Delta(1700) -> pi N(1535). Both are driven by the photoexcitation of the Delta (1700) and the second one involves a mechanism that leads to a triangle singularity. We are able to evaluate quantitatively the cross section for this process and show that it agrees with the experimental determination. Yet there are some differences with the standard partial wave analysis which does not include explicitly the triangle singularity. The exercise also shows the convenience of exploring possible triangle singularities in other reactions and how a standard partial wave analysis can be extended to accommodate them.
机译:我们研究了γp - > p pi(0)eta反应注意在低能量下的两个主要机制,γp - > delta(1700) - > eta delta(1232)和γp - > delta( 1700) - > PI n(1535)。 两者都是由三角洲(1700)的光透明的驱动,第二个是涉及导致三角形奇点的机制。 我们能够定量地评估该过程的横截面,并表明它同意实验确定。 然而,与标准部分波分析存在一些差异,不包括明确的三角形奇点。 该练习还示出了在其他反应中探索可能的三角形奇异性以及如何延长标准部分波分析以适应它们的便利性。

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