美因茨电子回旋加速器MAMI和MESA上的精细强子物理（英文）

Precision hadron physis at the Mainz Microtron MAMI and MESA

美因茨电子回旋加速器MAMI是用于强子和低能粒子物理领域固定靶实验的高流强电子加速器.它提供了能量高达1.6Ge V的极化束流.目前MAMI上两个主要的装置正在安装:高分辨谱仪A1和由晶体球探测器连同TAPS量能器组成的探测器A2.在MAMI上研究规划的亮点是:测量质子的电磁形状因子和极化度,这会涉及质子半径困惑;η介子的跃迁形状因子和斜率参数的测量;以及寻找假想的暗物质规范玻色子即暗光子.目前,美因茨的新电子加速器MESA正在准备之中,它将允许低动量传递下电弱混合角的精确测量及核、强子和粒子物理中各种低能电子-核子/原子核散射的测量.

The Mainz Microtron MAMI is a high-intensity electron accelerator for fixed-target experiments in the fields of hadron and low-energy particle physics. It provides a polarized beam of up to 1. 6 Ge V beam energy. Two major installations are currently in operation at MAMI: the high-resolution spectrometer setup A1 as well as the A2 detector setup,which consists of the Crystal Ball detector in conjunction with the TAPS calorimeter. Highlights of the research program at MAMI are measurements of the electromagnetic form factors and polarizabilities of the proton,which are related to the proton radius puzzle,the measurement of the transition form factors and slope parameters of the eta meson,as well as the search for hypothetical gauge bosons of the dark sector,also denoted as dark photons. Currently,the new electron accelerator MESA is in preparation at Mainz,which will allow for a precision measurement of the electroweak mixing angle at low momentum transfer as well as measurements of low-energy electronnucleon / nucleus scattering for various applications in nuclear,hadron,and particle physics.