Measurement of the π0→e+e−γ Dalitz decay at MAMI

Adlarson, P.; Afzal, F.; Aguar-Bartolome, P.; Ahmed, Z.; Akondi, C. S.; 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.; 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.

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Measurement of the π0→e+e−γ Dalitz decay at MAMI

Adlarson, P.; Afzal, F.; Aguar-Bartolome, P.; Ahmed, Z.; Akondi, C. S.; 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.; 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.

Date: 2017-02-09

Type: Text

ISSN: 2469-9985

Source:

Physical Review C 95(2), 025202. (2017)

Abstract:

The Dalitz decay π⁰→e⁺e⁻γ has been measured in the γp→π⁰p reaction with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The value obtained for the slope parameter of the π⁰ electromagnetic transition form factor, a_π=0.030±0.010_tot, is in agreement with existing measurements of this decay and with recent theoretical calculations. The uncertainty obtained in the value of a_π is lower than in previous results based on the π⁰→e⁺e⁻γ decay.