Search for a dark photon in the π⁰ to e^+e^-γ decay

WASA-at-COSY Collaboration: P. Adlarson , W. Augustyniak , W. Bardan , M. Bashkanov , F.S. Bergmann , M. Ber{\l}owski , H. Bhatt , A. Bondar

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M. B\"uscher H. Cal\'en I. Ciepa{\l} H. Clement D. Coderre E. Czerwi\'nski K. Demmich E. Doroshkevich R. Engels W. Erven W. Eyrich P. Fedorets K. F\"ohl K. Fransson F. Goldenbaum P. Goslawski A. Goswami K. Grigoryev C.-O. Gullstr\"om F. Hauenstein L. Heijkenskj\"old V. Hejny F. Hinterberger M. Hodana B. H\"oistad A. Jany B.R. Jany L. Jarczyk T. Johansson B. Kamys G. Kemmerling F.A. Khan A. Khoukaz S. Kistryn J. Klaja H. Kleines B. K{\l}os M. Krapp W. Krzemie\'n P. Kulessa A. Kup\'s\'c A. Kuzmin K. Lalwani D. Lersch L. Li B. Lorentz A. Magiera R. Maier P. Marciniewski B. Maria\'nski U.-G. Mei{\ss}ner M. Mikirtychiants H.-P. Morsch P. Moskal B.K. Nandi H. Ohm I. Ozerianska E. Perez del Rio N. Piskunov P. Pluci\'nski P. Podkopa{\l} D. Prasuhn A. Pricking D. Pszczel K. Pysz A. Pyszniak C.F. Redmer J. Ritman A. Roy Z. Rudy S. Sawant S. Schadmand A. Schmidt T. Sefzick V. Serdyuk N. Shah B. Shwartz M. Siemaszko R. Siudak T. Skorodko M. Skurzok J. Smyrski V. Sopov R. Stassen J. Stepaniak E. Stephan G. Sterzenbach H. Stockhorst H. Str\"oher A. Szczurek T. Tolba A. Trzci\'nski R. Varma G.J. Wagner W. W\c{e}glorz A. Wirzba M. Wolke A. Wro\'nska P. W\"ustner P. Wurm A. Yamamoto J. Zabierowski M.J. Zieli\'nski W. Zipper J. Z{\l}oma\'nczuk P. \.Zupra\'nski M. \.Zurek

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classification ✦ hep-ex hep-phnucl-ex

keywords gammadarkdecayepsilonparameterphotonsearchanomalous

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The presently world largest data sample of pi0 --> gamma e+e- decays containing nearly 5E5 events was collected using the WASA detector at COSY. A search for a dark photon U produced in the pi0 --> gamma U --> gamma e+e- decay from the pp-->pp\pi^0 reaction was carried out. An upper limit on the square of the U-gamma mixing strength parameter epsilon^2 of 5e-6 at 90% CL was obtained for the mass range 20 MeV <M_U< 100 MeV. This result together with other recent experimental limits significantly reduces the M_U vs. \epsilon^2 parameter space preferred by the measured value of the muon anomalous magnetic moment.

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Search for a dark photon in the π⁰ to e^+e^-γ decay

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