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

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, Th.; Supek, I.; Thiel, A.; Thiel, M.; Thomas, A.; Unverzagt, M.; Usov, Yu. A.; Wagner, S.; Walford, N.; Watts, D. P.; Werthmüller, D.; Wettig, J.; Witthauer, L.; Wolfes, M.; Zana, L. A.

doi:10.1103/PhysRevC.95.035208

Title: Measurement of the $ω \to π^{0} e^{+} e^{-}$ and $η \to e^{+} e^{-} γ$ Dalitz decays with the A2 setup at the Mainz Microtron

Journal Article · Wed Mar 22 00:00:00 EDT 2017 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.95.035208· OSTI ID:1439602

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. more »

The Dalitz decays η → e⁺e^-γ and ω → π⁰e⁺e^- have been measured in the γp → ηp and γp → ωp 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$$-2\atop{η}$$ = (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$$-2\atop{η}$$ is lower than in previous results based on the η → e⁺e^-γ decay. The value obtained for the ω slope parameter, Λ$$-2\atop{ωπ^0}$$ = (1.99 ± 0.21_tot) GeV^-2, is somewhat lower than previous measurements based on ω → π⁰μ⁺μ^-, but the results for the ω transition form factor are in better agreement with theoretical calculations, compared to earlier experiments.

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Research Organization:: George Washington Univ., Washington, DC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: A2 Collaboration at MAMI

Grant/Contract Number:: SC0016583; FG02-99-ER41110; FG02-88ER40415; FG02-01-ER41194

OSTI ID:: 1439602

Alternate ID(s):: OSTI ID: 1347815

Journal Information:: Physical Review C, Vol. 95, Issue 3; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Measurement of the $ω \to π^{0} e^{+} e^{-}$ and $η \to e^{+} e^{-} γ$ Dalitz decays with the A2 setup at the Mainz Microtron