Measurement of the decay η′ →π0π0η at MAMI

(A2 Collaboration at MAMI)

doi:10.1103/PhysRevD.98.012001

Measurement of the decay η′ →π0π0η at MAMI

(A2 Collaboration at MAMI)

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

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.

Original language	English
Article number	012001
Journal	Physical Review D
Volume	98
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevD.98.012001
State	Published - 1 Jul 2018

Bibliographical note

Publisher Copyright:
© 2018 authors. Published by the American Physical Society.

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10.1103/PhysRevD.98.012001

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@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",

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T1 - Measurement of the decay η′ →π0π0η at MAMI

AU - (A2 Collaboration at MAMI)

AU - Adlarson, P.

AU - Afzal, F.

AU - Ahmed, Z.

AU - Akondi, C. S.

AU - Annand, J. R.M.

AU - Arends, H. J.

AU - Beck, R.

AU - Borisov, N.

AU - Braghieri, A.

AU - Briscoe, W. J.

AU - Cividini, F.

AU - Collicott, C.

AU - Costanza, S.

AU - Denig, A.

AU - Downie, E. J.

AU - Dieterle, M.

AU - Ferretti Bondy, M. I.

AU - Gardner, S.

AU - Garni, S.

AU - Glazier, D. I.

AU - Glowa, D.

AU - Gradl, W.

AU - Gurevich, G.

AU - Hamilton, D. J.

AU - Hornidge, D.

AU - Huber, G. M.

AU - Käser, A.

AU - Kashevarov, V. L.

AU - Kay, S.

AU - Keshelashvili, I.

AU - Kondratiev, R.

AU - Korolija, M.

AU - Krusche, B.

AU - Lazarev, A.

AU - Linturi, J.

AU - Livingston, K.

AU - Macgregor, I. J.D.

AU - Manley, D. M.

AU - Martel, P. P.

AU - McGeorge, J. C.

AU - Middleton, D. G.

AU - Miskimen, R.

AU - Mushkarenkov, A.

AU - Neganov, A.

AU - Neiser, A.

AU - Oberle, M.

AU - Ostrick, M.

AU - Ott, P.

AU - Otte, P. B.

AU - Ron, G.

PY - 2018/7/1

Y1 - 2018/7/1

N2 - 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.

AB - 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.

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DO - 10.1103/PhysRevD.98.012001

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AN - SCOPUS:85051017860

SN - 2470-0010

VL - 98

JO - Physical Review D

JF - Physical Review D

IS - 1

M1 - 012001

ER -

Measurement of the decay η′ →π0π0η at MAMI

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