Measurement of the omega -> pi^0 e^+e^- and eta -> e^+e^-g Dalitz decays with the A2 setup at MAMI
Abstract
The Dalitz decays eta -> e^+e^-g and omega -> pi^0 e^+e^- have been measured in the g p -> eta p and g p -> omega p reactions, respectively, with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The value obtained for the slope parameter of the electromagnetic transition form factor of eta, Lambda^{-2}_eta=(1.97+/-0.11_tot) GeV^{-2}, is in good agreement with previous measurements of the eta -> e^+e^-g and eta -> mu^+mu^-g decays. The uncertainty obtained in the value of Lambda^{-2}_eta is lower than in previous results based on the eta -> e^+e^-g decay. The value obtained for the omega slope parameter, Lambda^{-2}_omega_pi^0 = (1.99+/-0.21_tot) GeV^{-2}, is somewhat lower than previous measurements based on omega -> pi^0 mu^+mu^-, but the results for the omega transition form factor are in better agreement with theoretical calculations, compared to earlier experiments.
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Cite
@article{arxiv.1609.04503,
title = {Measurement of the omega -> pi^0 e^+e^- and eta -> e^+e^-g Dalitz decays with the A2 setup at MAMI},
author = {P. Adlarson and F. Afzal and P. Aguar-Bartolomé and Z. Ahmed and J. R. M. Annand and H. J. Arends and K. Bantawa and R. Beck and H. Berghäuser and M. Biroth and N. S. Borisov and A. Braghieri and W. J. Briscoe and S. Cherepnya and F. Cividini and C. Collicott and S. Costanza and I. V. Danilkin and A. Denig and M. Dieterle and E. J. Downie and P. Drexler and M. I. Ferretti Bondy and L. V. Fil'kov and S. Gardner and S. Garni and D. I. Glazier and D. Glowa and W. Gradl and G. M. Gurevich and D. J. Hamilton and D. Hornidge and G. M. Huber and T. C. Jude and A. Käser and V. L. Kashevarov and S. Kay and I. Keshelashvili and R. Kondratiev and M. Korolija and B. Krusche and A. Lazarev and J. Linturi and V. Lisin and K. Livingston and I. J. D. MacGregor and R. Macrae and D. M. Manley and P. P. Martel and J. C. McGeorge and E. F. McNicoll and V. Metag and D. G. Middleton and R. Miskimen and E. Mornacchi and C. Mullen and A. Mushkarenkov and A. Neganov and A. Neiser and A. Nikolaev and M. Oberle and M. Ostrick and P. Ott and P. B. Otte and D. Paudyal and P. Pedroni and A. Polonski and S. Prakhov and A. Rajabi and J. Robinson and G. Ron and G. Rosner and T. Rostomyan and C. Sfienti and M. H. Sikora and V. Sokhoyan and K. Spieker and O. Steffen and I. I. Strakovsky and B. Strandberg and Th. Strub and I. Supek and A. Thiel and M. Thiel and A. Thomas and M. Unverzagt and Yu. A. Usov and S. Wagner and N. Walford and D. P. Watts and D. Werthmüller and J. Wettig and L. Witthauer and M. Wolfes and L. A. Zana},
journal= {arXiv preprint arXiv:1609.04503},
year = {2017}
}
Comments
19 figures, 2 tables