Measurement of the decay η′→π0π0η at MAMI

Adlarson, P. et al. (2018) Measurement of the decay η′→π0π0η at MAMI. Physical Review D, 98, 012001. (doi:10.1103/PhysRevD.98.012001)

Adlarson, P. et al. (2018) Measurement of the decay η′→π0π0η at MAMI. Physical Review D, 98, 012001. (doi:10.1103/PhysRevD.98.012001)

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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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:McGeorge, Dr John and Gardner, Mr Simon and Werthmueller, Dr Dominik and Livingston, Dr Kenneth and MacGregor, Professor I and Annand, Dr John and Hamilton, Dr David and Glazier, Dr Derek
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, J., 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., Werthmueller, D., Wettig, J., Witthauer, L., Wolfes, M., Workman, R.L., and Zana, L.A.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review D
Publisher:American Physical Society
ISSN:2470-0010
ISSN (Online):2470-0029
Copyright Holders:Copyright © 2018 American Physical Society
First Published:First published in Physical Review D 98:012001
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
507271Illuminating strongly interacting matterI MacgregorScience & Technology Facilities Council (STFC)ST/G008604/1P&A - PHYSICS & ASTRONOMY
570711Nuclear Physics GroupDavid IrelandScience & Technology Facilities Council (STFC)ST/J000175/1P&A - PHYSICS & ASTRONOMY