Measurement of the omega -> pi⁰ e^+e^- and eta -> e^+e^-g Dalitz decays with the A2 setup at MAMI

P. Adlarson , F. Afzal , P. Aguar-Bartolom\'e , Z. Ahmed , J. R. M. Annand , H. J. Arends , K. Bantawa , R. Beck

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H. Bergh\"auser M. Biroth N. S. Borisov A. Braghieri W. J. Briscoe S. Cherepnya F. Cividini C. Collicott S. Costanza I. V. Danilkin A. Denig M. Dieterle E. J. Downie P. Drexler M. I. Ferretti Bondy L. V. Fil'kov S. Gardner S. Garni D. I. Glazier D. Glowa W. Gradl G. M. Gurevich D. J. Hamilton D. Hornidge G. M. Huber T. C. Jude A. K\"aser V. L. Kashevarov S. Kay I. Keshelashvili R. Kondratiev M. Korolija B. Krusche A. Lazarev J. Linturi V. Lisin K. Livingston I. J. D. MacGregor R. MacRae D. M. Manley P. P. Martel J. C. McGeorge E. F. McNicoll V. Metag D. G. Middleton R. Miskimen E. Mornacchi C. Mullen A. Mushkarenkov A. Neganov A. Neiser A. Nikolaev M. Oberle M. Ostrick P. Ott P. B. Otte D. Paudyal P. Pedroni A. Polonski S. Prakhov A. Rajabi J. Robinson G. Ron G. Rosner T. Rostomyan C. Sfienti M. H. Sikora V. Sokhoyan K. Spieker O. Steffen I. I. Strakovsky B. Strandberg Th. Strub I. Supek A. Thiel M. Thiel A. Thomas M. Unverzagt Yu. A. Usov S. Wagner N. Walford D. P. Watts D. Werthm\"uller J. Wettig L. Witthauer M. Wolfes L. A. Zana

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classification ✦ hep-ex nucl-ex

keywords omegadecayslambdaobtainedpreviousvalueagreementdalitz

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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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Measurement of the omega -> pi⁰ e^+e^- and eta -> e^+e^-g Dalitz decays with the A2 setup at MAMI

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