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Title: Measurement of the decay η ' π 0 π 0 η at MAMI

An experimental study of the η' → π 0π 0η → 6$$\gamma$$ decay has been conducted with the best up- to-date statistical accuracy, by measuring η' mesons produced in the $$\gamma$$p → η'p reaction with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The results obtained for the standard parametrization of the η' → π 0π 0η matrix element are consistent with the most recent results for η' → ππη decays, but have smaller uncertainties. Finally, the available statistics and experimental resolution allowed, for the first time, an observation of a structure below the π +π - 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 ππ scattering length combination, a 0 - a 2, extracted from K → 3π decays.
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Publication Date:
Grant/Contract Number:
SC0014323; FG02-99-ER41110; FG02-88ER40415; FG02-01-ER41194; SC0016583
Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 98; Journal Issue: 1; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Research Org:
Kent State Univ., Kent, OH (United States); George Washington Univ., Washington, DC (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Orgs:
A2 Collaboration at MAMI
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Meson decays; effective field theory; hadron-hadron interactions; hadronic decays; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1458793
Alternate Identifier(s):
OSTI ID: 1460973; OSTI ID: 1464051