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• W3100916076 abstract "We investigate the Schmid theorem, which states that if one has a tree level mechanism with a particle decaying to two particles and one of them decaying posteriorly to two other particles, the possible triangle singularity developed by the mechanism of elastic rescattering of two of the three decay particles does not change the cross section provided by the tree level. We investigate the process in terms of the width of the unstable particle produced in the first decay and determine the limits of validity and violation of the theorem. One of the conclusions is that the theorem holds in the strict limit of zero width of that resonance, in which case the strength of the triangle diagram becomes negligible compared to the tree level. Another conclusion, on the practical side, is that for realistic values of the width, the triangle singularity can provide a strength comparable or even bigger than the tree level, which indicates that invoking the Schmid theorem to neglect the triangle diagram stemming from elastic rescattering of the tree level should not be done. Even then, we observe that the realistic case keeps some memory of the Schmid theorem, which is visible in a peculiar interference pattern with the tree level." @default.
• W3100916076 created "2020-11-23" @default.
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• W3100916076 date "2019-01-01" @default.
• W3100916076 modified "2023-10-16" @default.
• W3100916076 title "Considerations on the Schmid theorem for triangle singularities" @default.
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• W3100916076 doi "https://doi.org/10.1140/epjc/s10052-019-6558-1" @default.
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