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Title A small proton charge radius from an electron–proton scattering experiment
Abstract Elastic electron–proton scattering (e–p) and the spectroscopy of hydrogen atoms are the two methods traditionally used to determine the proton charge radius, rp. In 2010, a new method using muonic hydrogen atoms1 found a substantial discrepancy compared with previous results2, which became known as the ‘proton radius puzzle’. Despite experimental and theoretical efforts, the puzzle remains unresolved. In fact, there is a discrepancy between the two most recent spectroscopic measurements conducted on ordinary hydrogen3,4. Here we report on the proton charge radius experiment at Jefferson Laboratory (PRad), a high-precision e–p experiment that was established after the discrepancy was identified. We used a magnetic-spectrometer-free method along with a windowless hydrogen gas target, which overcame several limitations of previous e–p experiments and enabled measurements at very small forward-scattering angles. Our result, rp = 0.831 ± 0.007stat ± 0.012syst femtometres, is smaller than th
Author(s) W. Xiong, Ashot Gasparian, H. Gao, D. Dutta, M. Khandaker, N. Liyanage, E. Pasyuk, C. Peng, X. Bai, L. Ye, K. Gnanvo, C. Gu, M. Levillain, X. Yan, D. Higinbotham, M. Meziane, Z. Ye, Krishna Adhikari, B. Aljawrneh, H. Bhatt, D. Bhetuwal, J. Brock, Volker Burkert, C. Carlin, A. Deur, D. Di, J. Dunne, P. Ekanayaka, L. El Fassi, B. Emmich, L. Gan, O. Glamazdin, M. Kabir, A. Karki, C. Keith, S. Kowalski, V. Lagerquist, I. Larin, T. Liu, A. Liyanage, J. Maxwell, D. Meekins, S. Nazeer, V. Nelyubin, H. Nguyen, P. Pedroni, C. Perdrisat, J. Pierce, V. Punjabi, M. Shabestari, A. Shahinyan, R. Silwal, S. Stepanyan, A. Subedi, V. Tarasov, N. Ton, Y.-W. Zhang, Z. Zhao
Publication Date November 2019
Document Type Journal Article
Primary Institution Thomas Jefferson National Accelerator Facility, Newport News
Affiliation Exp Nuclear Physics / Experimental Halls / Hall B
Funding Source Nuclear Physics (NP)
Proprietary? No
This publication conveys Technical Science Results
Document Numbers
JLAB Number: JLAB-PHY-19-3107 OSTI Number: 1575200
LANL Number: Other Number: DOE/OR/23177-4853
Associated with an experiment Yes
Experiment Number(s)
E12-11-106
Associated with EIC No
Supported by Jefferson Lab LDRD Funding No
Journal Article
Journal Name Nature
Refereed Yes
Volume 575
Issue 7781
Page(s) 147-150
Attachments/Datasets/DOI Link
Document(s)
DOI Link
Dataset(s) (none)
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