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

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arxiv 1611.04739 v2 pith:XCECAXJN submitted 2016-11-15 hep-ex nucl-ex

Measurement of the pi^0 -> 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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keywords decaygammadalitzmainzmicrotronobtainedvalueagreement
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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