@article{d5aa6014948f4068a9891310e2a636b8,
title = "Measurement of the decay η′ →π0π0η at MAMI",
abstract = "An experimental study of the η′→π0π0η→6γ decay has been conducted with the best up-to-date statistical accuracy, by measuring η′ mesons produced in the γp→η′p reaction with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The results obtained for the standard parametrization of the η′→π0π0η matrix element are consistent with the most recent results for η′→ππη decays, but have smaller uncertainties. 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, a0-a2, extracted from K→3π decays.",
author = "{(A2 Collaboration at MAMI)} and P. Adlarson and F. Afzal and Z. Ahmed and Akondi, {C. S.} and Annand, {J. R.M.} and Arends, {H. J.} and R. Beck and N. Borisov and A. Braghieri and Briscoe, {W. J.} and F. Cividini and C. Collicott and S. Costanza and A. Denig and Downie, {E. J.} and M. Dieterle and {Ferretti Bondy}, {M. I.} and S. Gardner and S. Garni and Glazier, {D. I.} and D. Glowa and W. Gradl and G. Gurevich and Hamilton, {D. J.} and D. Hornidge and Huber, {G. M.} and A. K{\"a}ser and Kashevarov, {V. L.} and S. Kay and I. Keshelashvili and R. Kondratiev and M. Korolija and B. Krusche and A. Lazarev and J. Linturi and K. Livingston and Macgregor, {I. J.D.} and Manley, {D. M.} and Martel, {P. P.} and McGeorge, {J. C.} and Middleton, {D. G.} and R. Miskimen and A. Mushkarenkov and A. Neganov and A. Neiser and M. Oberle and M. Ostrick and P. Ott and Otte, {P. B.} and G. Ron",
note = "Publisher Copyright: {\textcopyright} 2018 authors. Published by the American Physical Society.",
year = "2018",
month = jul,
day = "1",
doi = "10.1103/PhysRevD.98.012001",
language = "אנגלית",
volume = "98",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "1",
}