{"paper":{"title":"New high-statistics measurement of the $\\pi^0 \\to e^+e^-\\gamma$ Dalitz decay at the Mainz Microtron","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A. Braghieri, A. Denig, A. K\\\"aser, A. Lazarev, A. Neganov, A. Neiser, A. Powell, A. S. Dolzhikov, A. Thomas, B. Krusche, C. Collicott, C. Mullen, D. Ghosal, D. Hornidge, D. I. Glazier, D. M. Manley, D. Paudyal, D. P. Watts, D. Werthm\\\"uller, E. J. Downie, E. Mornacchi, E. Rickert, F. Afzal, F. Cividini, G. M. Gurevich, G. M. Huber, I. Gorodnov, I. I. Strakovsky, I. J. D. MacGregor, I. Supek, J. R. M. Annand, J. Wettig, K. Altangerel, K. Livingston, K. Spieker, L. Heijkenskj\\\"old, M. Bashkanov, M. Biroth, M. Dieterle, M. G\\\"unther, M. Korolija, M. Mocanu, M. Ostrick, M. Thiel, M. Wolfes, N. S. Borisov, N. Zachariou, O. Steffen, P. Achenbach, P. Adlarson, P. B. Otte, P. Drexler, P. Pedroni, P. P. Martel, R. Beck, R. Miskimen, S. Abt, S. Costanza, S. Fegan, S. Gardner, S. J. D. Kay, S. Lutterer, S. Prakhov, S. Wagner, Th. Strub, T. Rostomyan, V. L. Kashevarov, V. Sokhoyan, W. Gradl, W. J. Briscoe, Yu. A. Usov, Z. Ahmed","submitted_at":"2025-12-03T04:24:11Z","abstract_excerpt":"The Dalitz decay $\\pi^0 \\to e^+e^-\\gamma$ has\n  been measured with the highest statistical accuracy obtained so far in\n  the $\\gamma p\\to \\pi^0 p$ reaction with the A2 tagged-photon facility at the Mainz Microtron, MAMI.\n  The value of the slope parameter for the $\\pi^0$ electromagnetic transition form factor,\n  $a_\\pi=0.0315\\pm 0.0026_{\\mathrm{stat}}\\pm 0.0010_{\\mathrm{syst}}$,\n  is obtained from the analysis of $2.4\\times10^6$ $\\pi^0 \\to e^+e^-\\gamma$ observed decays.\n  Within experimental uncertainties, it is in agreement with existing measurements and\n  theoretical calculations, with its o"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2512.03431","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2512.03431/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}