Speaker
Description
Recently structures in invariant mass distributions and excitation energy spectra have been attributed to triangular singularities as discussed in e.g., [1, 2] and in the review by Guo et al.[3]. These singularities emerge under specific kinematic conditions when new reaction channels open up. It will be shown that a triangular singularity associated with the opening of the γp → pa0 → pπ0η channel can explain the observation of a structure in the Mpη invariant mass distribution near 1700 MeV/c2 in the γp → pπ0η reaction [4]
References
[1] G. D. Alexeev et al., The COMPASS Collaboration, Phys. Rev. Lett 127, 082501 (2021).
[2] M. Mikhasenko, B. Ketzer and A. Sarantsev, Phys. Rev. D 91, 094015 (2015).
[3] F. K. Guo et al., Rev. Mod. Phys. D 90, 015004 (2018).
[4] V. Metag et al.,EPJA 57, 325 (2021).
∗Supported by DFG through SFB/TR16.
| speaker affiliation | II. Physikalisches Institut, University of Giessen |
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