Measurement of the pi⁰ -> e^+e^-gamma Dalitz decay at the Mainz Microtron

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

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R. Beck H. Bergh\"auser M. Biroth N. S. Borisov A. Braghieri W. J. Briscoe S. Cherepnya F. Cividini C. Collicott S. Costanza 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 V. V. Kulikov A. Lazarev J. Linturi V. Lisin K. Livingston I. J. D. MacGregor R. MacRae D. M. Manley P. P. Martel M. Martemianov 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 decaygammadalitzmainzmicrotronobtainedvalueagreement

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The Dalitz decay pi^0 -> e^+e^-gamma has been measured in the gamma p -> pi^0 p reaction with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The value obtained for the slope parameter of the pi^0 electromagnetic transition form factor, a_pi = 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_pi is lower than in previous results based on the pi^0 -> e^+e^-gamma decay.

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Measurement of the pi⁰ -> e^+e^-gamma Dalitz decay at the Mainz Microtron

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