4月26日（金）、Legris Clement氏 (Tohoku University）による宇宙創成物理学国際共同大学院（GP-PU）セミナー「Determination of the proton charge radius using low energy electron scattering」を開催いたします。

■日　　時
2024年4月26日（金）13:00-15:00

■セミナー題目
"Determination of the proton charge radius using low energy electron scattering"
by Legris Clement (Tohoku University)

■開催形式
対面×オンライン（Zoom）併用
[対面会場] 理学研究科合同A-B棟721号室 （キャンパスマップ「H-03」の建物です。）

■参加登録
参加者は事前に下記URLで参加登録が必要です
https://us02web.zoom.us/meeting/register/tZEpcu6srDksG93yxVGMAN71wK9qkda3kx3x#

■概　　要
The proton charge radius is one of the most basic characteristics of the nucleons and is crucial for many applications, such as the determination of the Rydberg constant, for QED tests or to evaluate lattice QCD results. Its determination is a hot topic in the nuclear physics community as throughout several experiments, the proton charge radius has been reported either close to 0.84 fm or 0.88 fm using electron scattering as well as atomic and muonic hydrogen spectroscopy.
The proton charge radius is obtained from the cross section of the elastic lepton proton scattering at low momentum transfer Q^2. At ELPH, we are conducting the most reliable measurement of the proton charge radius with electron proton scattering during the ULQ^2 (Ultra-Low Q^2) experiment using the world's lowest energy beam for electron scattering. The main specificities of the ULQ^2 experiment are the low beam energy and the use of a plastic CH! target that allows the absolute normalization of the hydrogen to the carbon scattering cross-section.
The new beam line as well as the twin spectrometers have been commissioned and the measurement of the detector efficiency is already complete. Most of the data taking for the proton charge radius measurement is finished and the analysis to determine the proton radius is underway.

■Point
GSP 1

■お問合せ
物理学専攻（GP-PU）　古城　徹　
E-mail: toru.kojo.b1[at]tohoku.ac.jp
（[at]を@に置き換えてください）