Measurement of the decay η0 → π0π0η at MAMI

Adlarson, P.; Afzal, F.; Ahmed, Z.; Akondi, C. S.; Annand, J. R. M.; Arends, H. J.; Beck, R.; Borisov, N.; Braghieri, A.; Briscoe, W. J.; Cividini, F.; Collicott, C.; Costanza, S.; Denig, A.; Downie, E. J.; Dieterle, M.; Ferretti Bondy, M. I.; Gardner, S.; Garni, S.; Glazier, D. I.; Glowa, D.; Gradl, W.; Gurevich, G.
.; Hamilton, D. J.; Hornidge, D.; Huber, G. M.; Käser, A.; Kashevarov, V. L.; Kay, S; Keshelashvili, I.; Kondratiev, R.; Korolija, M.
.; Krusche, B.; Lazarev, A; Linturi, James M.; Livingston, K.; Macgregor, I. J.D.; Manley, D. M.; Martel, P. P.; McGeorge, J. C.; Middleton, D. G.; Miskimen, R.; Mushkarenkov, A.; Neganov, A.; Neiser, A.; Oberle, M.; Ostrick, M.; Ott, P.; Otte, P. B.; Oussena, B.; Paudyal, D.; Pedroni, P.; Polonski, A.; Prakhov, S.; Rajabi, A.; Ron, G.; Rostomyan, T.; Sarty, A.; Sfienti, C.; Sokhoyan, V.; Spieker, K.; Steffen, O.; Strakovsky, I. I.; Strub, T.; Supek, I.; Thiel, A.; Thiel, M.; Tiator, L.; Thomas, A.; Unverzagt, M.; Usov, Y. A.; Wagner, S.; Watts, D. P.; Werthmüller, D.; Wettig, J.; Witthauer, L.; Wolfes, M.; Workman, R. L.; Zana, L. A.

Please use this identifier to cite or link to this item: https://repository.seku.ac.ke/handle/123456789/4290

Title:	Measurement of the decay η0 → π0π0η at MAMI
Authors:	Adlarson, P. Afzal, F. Ahmed, Z. Akondi, C. S. Annand, J. R. M. Arends, H. J. Beck, R. Borisov, N. Braghieri, A. Briscoe, W. J. Cividini, F. Collicott, C. Costanza, S. Denig, A. Downie, E. J. Dieterle, M. Ferretti Bondy, M. I. Gardner, S. Garni, S. Glazier, D. I. Glowa, D. Gradl, W. Gurevich, G. . Hamilton, D. J. Hornidge, D. Huber, G. M. Käser, A. Kashevarov, V. L. Kay, S Keshelashvili, I. Kondratiev, R. Korolija, M. . Krusche, B. Lazarev, A Linturi, James M. Livingston, K. Macgregor, I. J.D. Manley, D. M. Martel, P. P. McGeorge, J. C. Middleton, D. G. Miskimen, R. Mushkarenkov, A. Neganov, A. Neiser, A. Oberle, M. Ostrick, M. Ott, P. Otte, P. B. Oussena, B. Paudyal, D. Pedroni, P. Polonski, A. Prakhov, S. Rajabi, A. Ron, G. Rostomyan, T. Sarty, A. Sfienti, C. Sokhoyan, V. Spieker, K. Steffen, O. Strakovsky, I. I. Strub, T. Supek, I. Thiel, A. Thiel, M. Tiator, L. Thomas, A. Unverzagt, M. Usov, Y. A. Wagner, S. Watts, D. P. Werthmüller, D. Wettig, J. Witthauer, L. Wolfes, M. Workman, R. L. Zana, L. A.
Issue Date:	2018
Publisher:	American Physical Society
Citation:	Physical Review D, 98, 012001
Abstract:	An experimental study of the η0 → π0π0η → 6γ decay has been conducted with the best up-to-date statistical accuracy, by measuring η0 mesons produced in the γp → η0 p reaction with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The results obtained for the standard parametrization of the η0 → π0π0η matrix element are consistent with the most recent results for η0 → ππη decays, but have smaller uncertainties. The available statistics and experimental resolution allowed, for the first time, an observation of a structure below the πþπ− 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
Description:	DOI: 10.1103/PhysRevD.98.012001
URI:	https://journals.aps.org/prd/pdf/10.1103/PhysRevD.98.012001 http://repository.seku.ac.ke/handle/123456789/4290
ISSN:	2470-0010 2470-0029
Appears in Collections:	School of Science and Computing (JA)

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