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-Bartolome, P.; Ahmed, Z.; Annand, J. R. M.; Arends, H. J.; Bantawa, K.; Beck, R.; Berghauser, 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.

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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-Bartolome, P.; Ahmed, Z.; Annand, J. R. M.; Arends, H. J.; Bantawa, K.; Beck, R.; Berghauser, 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.

Date: 2017-03-22

Type: Text

ISSN: 2469-9985

Source:

Physical Review C 95(3), 035208. (2017)

Abstract:

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_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_ωπ⁰=(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.