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在美因茨微子加速器上对 $\pi^0 \to e^+e^-\gamma$ 达利兹衰变的新高统计量测量

New high-statistics measurement of the $π^0 \to e^+e^-γ$ Dalitz decay at the Mainz Microtron

University of Mainz(美因茨大学);University of Basel(巴塞尔大学);University of Bonn(波恩大学);University of Regina(里贾纳大学);SUPA School of Physics and Astronomy, University of Glasgow(格拉斯哥大学物理与天文学学院);Department of Physics, University of York(约克大学物理系);Joint Institute for Nuclear Research(联合核研究所);INFN Sezione di Pavia(帕维亚 INFN 分部);The George Washington University(乔治华盛顿大学)
S. Prakhov, L. Heijkenskjöld, S. Abt, P. Achenbach, P. Adlarson, F. Afzal, Z. Ahmed, K. Altangerel, J. R. M. Annand, M. Bashkanov, R. Beck, M. Biroth, N. S. Bor… 展开作者

S. Prakhov, L. Heijkenskjöld, S. Abt, P. Achenbach, P. Adlarson, F. Afzal, Z. Ahmed, K. Altangerel, J. R. M. Annand, M. Bashkanov, R. Beck, M. Biroth, N. S. Borisov, A. Braghieri, W. J. Briscoe, F. Cividini, C. Collicott, S. Costanza, A. Denig, M. Dieterle, A. S. Dolzhikov, E. J. Downie, P. Drexler, S. Fegan, S. Gardner, D. Ghosal, D. I. Glazier, I. Gorodnov, W. Gradl, M. Günther, G. M. Gurevich, D. Hornidge, G. M. Huber, A. Käser, V. L. Kashevarov, S. J. D. Kay, M. Korolija, B. Krusche, A. Lazarev, K. Livingston, S. Lutterer, I. J. D. MacGregor, D. M. Manley, P. P. Martel, R. Miskimen, M. Mocanu, E. Mornacchi, C. Mullen, A. Neganov, A. Neiser, M. Ostrick, P. B. Otte, D. Paudyal, P. Pedroni, A. Powell, E. Rickert, T. Rostomyan, V. Sokhoyan, K. Spieker, O. Steffen, I. I. Strakovsky, Th. Strub, I. Supek, M. Thiel, A. Thomas, Yu. A. Usov, S. Wagner, D. P. Watts, D. Werthmüller, J. Wettig, M. Wolfes, N. Zachariou

AI总结:

基于γp→π0p反应,在MAMI上以2.4×10^6个事例高统计测量π0→e+e-γ达利兹衰变,得到电磁跃迁形状因子斜率参数aπ=0.0315±0.0026stat±0.0010syst,精度优于此前结果。

摘要:

达利兹衰变 $\pi^0 \to e^+e^-\gamma$ 已在美因茨微子加速器 MAMI 的 A2 标记光子设施中,通过 $\gamma p\to \pi^0 p$ 反应以迄今最高的统计精度进行了测量。从 $2.4\times10^6$ 个观测到的 $\pi^0 \to e^+e^-\gamma$ 衰变分析中,得到了 $\pi^0$ 电磁跃迁形状因子的斜率参数 $a_\pi=0.0315\pm 0.0026_{\mathrm{stat}}\pm 0.0010_{\mathrm{syst}}$。在实验不确定度范围内,该结果与现有测量和理论计算一致,且其自身不确定度小于以往基于 $\pi^0\to e^+e^-\gamma$ 衰变分析的结果。

英文摘要:

The Dalitz decay $π^0 \to e^+e^-γ$ has been measured with the highest statistical accuracy obtained so far in the $γp\to π^0 p$ reaction with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The value of the slope parameter for the $π^0$ electromagnetic transition form factor, $a_π=0.0315\pm 0.0026_{\mathrm{stat}}\pm 0.0010_{\mathrm{syst}}$, is obtained from the analysis of $2.4\times10^6$ $π^0 \to e^+e^-γ$ observed decays. Within experimental uncertainties, it is in agreement with existing measurements and theoretical calculations, with its own uncertainty being smaller than previous results based on the analysis of $π^0\to e^+e^-γ$ decays.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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