Back to Search
Start Over
Measurement of the decay $\eta^{\prime}\to\pi^{0}\pi^{0}\eta$ at MAMI
- Source :
- Phys. Rev. D 98, 012001 (2018)
- Publication Year :
- 2017
-
Abstract
- An experimental study of the $\eta'\to \pi^0\pi^0\eta \to 6\gamma$ decay has been conducted with the best up-to-date statistical accuracy, by measuring $\eta'$ mesons produced in the $\gamma p \to \eta' p$ reaction with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The results obtained for the standard parametrization of the $\eta'\to \pi^0\pi^0\eta$ matrix element are consistent with the most recent results for $\eta'\to\pi\pi\eta$ decays, but have smaller uncertainties. The available statistics and experimental resolution allowed, for the first time, an observation of a structure below the $\pi^+\pi^-$ mass threshold, the magnitude and sign of which, checked within the framework of the nonrelativistic effective-field theory, demonstrated good agreement with the cusp that was predicted based on the $\pi\pi$ scattering length combination, $a_0-a_2$, extracted from $K \to 3\pi$ decays.<br />Comment: 15 pages, 8 figures, 2 tables, accepted for publication in Phys. Rev. D
- Subjects :
- High Energy Physics - Experiment
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. D 98, 012001 (2018)
- Publication Type :
- Report
- Accession number :
- edsarx.1709.04230
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevD.98.012001