Measurement of Proton Charge Radius by Low-Energy Electron Scattering

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  • Suda Toshimi
    Research Center for Electron Photon Science, Tohoku University
  • Aoyagi Taihei
    Research Center for Electron Photon Science, Tohoku University
  • Honda Yuki
    Research Center for Electron Photon Science, Tohoku University
  • Maeda Yukie
    Faculty of Engineering, University of Miyazaki
  • Miura Sadao
    Research Center for Electron Photon Science, Tohoku University
  • Muto Toshiya
    Research Center for Electron Photon Science, Tohoku University
  • Namba Kazuki
    Research Center for Electron Photon Science, Tohoku University
  • Nanbu Ken-ichi
    Research Center for Electron Photon Science, Tohoku University
  • Takahashi Ken
    Research Center for Electron Photon Science, Tohoku University
  • Tamae Tadaaki
    Research Center for Electron Photon Science, Tohoku University
  • Tsukada Kyo
    Research Center for Electron Photon Science, Tohoku University

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Other Title
  • 低エネルギー電子散乱による陽子電荷半径測定
  • テイエネルギー デンシ サンラン ニ ヨル ヨウシ デンカ ハンケイ ソクテイ

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<p>We are facing a serious confusion about the proton size, referred to as “Proton Radius Puzzle.” The proton charge radius determined by electron scattering and hydrogen spectroscopy, and that determined by muonic hydrogen spectroscopy disagree seriously, and the reason is not yet clear. It is a big surprise to realize that we do not yet fully pin down the most basic feature of the proton. In this article, we discuss on an on-going project at the Research Center for Electron-Photon Science (ELPH), Tohoku University to determine the proton charge radius by low-energy electron scattering under the lowest-ever momentum transfer, which is crucial to extract the radius reliably from electron scattering data. It is worth emphasizing that ELPH is the only facility in the world, where such a low-energy electron scattering experiment is possible.</p>

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