arXiv 2102.114492021-02nucl-ex

低Q下正电子-质子弹性散射$^2$

Elastic Positron-Proton Scattering at Low Q$^2$

Tyler J. Hague, Dipangkar Dutta, Douglas W. Higinbotham, Xinzhan Bai, Haiyan Gao, Ashot Gasparian, Kondo Gnanvo, Vladimir Khachatryan, Mahbub Khandaker, Nilanga… 展开作者

Tyler J. Hague, Dipangkar Dutta, Douglas W. Higinbotham, Xinzhan Bai, Haiyan Gao, Ashot Gasparian, Kondo Gnanvo, Vladimir Khachatryan, Mahbub Khandaker, Nilanga Liyanage, Eugene Pasyuk, Chao Peng, Weizhi Xiong, Jingyi Zhou

备注：: 9 pages, 8 figures. arXiv admin note: substantial text overlap with arXiv:2007.15081
发表信息：: Eur. Phys. J. A 57, 199 (2021)
DOI：: 10.1140/epja/s10050-021-00508-6

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摘要：

由普通原子和μ子原子确定的质子电荷半径的系统差异，引起了人们对弹性轻子散射测量的兴趣重新抬头。质子的电荷半径定义为Q $^2$ =0时电荷形状因子的斜率，与探针无关。当从普通氢和μ子氢确定质子的表观大小时，任何差异都可能指向新的物理学或需要更高阶的修正。虽然最近的测量现在似乎是一致的，但迄今为止还没有高精度的电子和正电子弹性散射数据。高精度的质子半径测量可以在Jefferson实验室的Hall B中使用正电子束和基于PRad实验装置的量热计进行。这种测量也可以扩展到氘核，在氘核电荷半径的μ子和电子测定之间观察到类似的差异。一种新的，高精度的正电子测量，当与电子散射测量和即将到来的MUSE μ子散射测量一起观察时，可以帮助提供对质子半径之谜起源的新见解，并为辐射校正计算提供新的实验约束。

英文摘要：

Systematic differences in the the proton's charge radius, as determined by ordinary atoms and muonic atoms, have caused a resurgence of interest in elastic lepton scattering measurements. The proton's charge radius, defined as the slope of the charge form factor at Q$^2$=0, does not depend on the probe. Any difference in the apparent size of the proton, when determined from ordinary versus muonic hydrogen, could point to new physics or need for the higher order corrections. While recent measurements seem to now be in agreement, there is to date no high precision elastic scattering data with both electrons and positrons. A high precision proton radius measurement could be performed in Hall B at Jefferson Lab with a positron beam and the calorimeter based setup of the PRad experiment. This measurement could also be extended to deuterons where a similar discrepancy has been observed between the muonic and electronic determination of deuteron charge radius. A new, high precision measurement with positrons, when viewed alongside electron scattering measurements and the forthcoming MUSE muon scattering measurement, could help provide new insights into the origins of the proton radius puzzle, and also provide new experimental constraints on radiative correction calculations.

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