Measurement of the ω→π0e+e− and η→e+e−γ Dalitz decays with the A2 setup at the Mainz Microtron

Adlarson, P. et al. (2017) Measurement of the ω→π0e+e− and η→e+e−γ Dalitz decays with the A2 setup at the Mainz Microtron. Physical Review C, 95, 035208. (doi: 10.1103/PhysRevC.95.035208)

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The Dalitz decays η → e + e − γ and ω → π 0 e + e − have been measured in the γ p → η p and γ p → ω p reactions, respectively, with the A2 tagged-photon facility at the Mainz Microtron. The value obtained for the slope parameter of the electromagnetic transition form factor of η , Λ − 2 η = ( 1.97 ± 0 . 11 tot ) GeV − 2 , is in good agreement with previous measurements of the η → e + e − γ and η → μ + μ − γ decays. The uncertainty obtained in the value of Λ − 2 η is lower than in previous results based on the η → e + e − γ decay. The value obtained for the ω slope parameter, Λ − 2 ω π 0 = ( 1.99 ± 0 . 21 tot ) GeV − 2 , is somewhat lower than previous measurements based on ω → π 0 μ + μ − , but the results for the ω transition form factor are in better agreement with theoretical calculations, compared to earlier experiments.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Strandberg, Mr Bruno and Glazier, Dr Derek and McGeorge, Dr John and Robinson, Mr Jamie and Werthmueller, Dr Dominik and MacGregor, Professor Douglas and Livingston, Dr Kenneth and Gardner, Mr Simon and Mullen, Mr Christopher and Macrae, Mr Roddy and Annand, Dr John and Hamilton, Dr David and Rosner, Professor Guenther
Authors: Adlarson, P., Afzal, F., Aguar-Bartolomé, P., Ahmed, Z., Annand, J.R.M., Arends, H.J., Bantawa, K., Beck, R., Berghäuser, H., Biroth, M., Borisov, N.S., Braghieri, A., Briscoe, W.J., Cherepnya, S., Cividini, F., Collicott, C., Costanza, S., Danilkin, I.V., Denig, A., Dieterle, M., Downie, E.J., Drexler, P., Ferretti Bondy, M.I., Fil'kov, L.V., Gardner, S., Garni, S., Glazier, D.I., Glowa, D., Gradl, W., Gurevich, G.M., Hamilton, D.J., Hornidge, D., Huber, G.M., Jude, T.C., Käser, A., Kashevarov, V.L., Kay, S., Keshelashvili, I., Kondratiev, R., Korolija, M., Krusche, B., Lazarev, A., Linturi, J., Lisin, V., Livingston, K., MacGregor, I.J.D., Macrae, R., Manley, D.M., Martel, P.P., McGeorge, J.C., McNicoll, E.F., Metag, V., Middleton, D.G., Miskimen, R., Mornacchi, E., Mullen, C., Mushkarenkov, A., Neganov, A., Neiser, A., Nikolaev, A., Oberle, M., Ostrick, M., Ott, P., Otte, P.B., Paudyal, D., Pedroni, P., Polonski, A., Prakhov, S., Rajabi, A., Robinson, J., Ron, G., Rosner, G., Rostomyan, T., Sfienti, C., Sikora, M.H., Sokhoyan, V., Spieker, K., Steffen, O., Strakovsky, I.I., Strandberg, B., Strub, T., Supek, I., Thiel, A., Thiel, M., Thomas, A., Unverzagt, M., Usov, Y. A., Wagner, S., Walford, N., Watts, D.P., Werthmueller, D., Wettig, J., Witthauer, L., Wolfes, M., and Zana, L.A.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review C
Publisher:American Physical Society
ISSN (Online):2469-9993

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