A small proton charge radius from an electron–proton scattering experiment

@article{Xiong2019ASP,
  title={A small proton charge radius from an electron–proton scattering experiment},
  author={Weizhi Xiong and A. Gasparian and H. Gao and D. Dutta and M. Khandaker and Nilanga K. Liyanage and Eugene Pasyuk and Chao Peng and Xinzhan Bai and Li Ye and Kondo Gnanvo and Chao Gu and Maxime Levillain and X. Yan and Douglas W. Higinbotham and Mehdi Meziane and Zhihong Ye and K. Adhikari and Bashar Aljawrneh and H. Bhatt and D. Bhetuwal and James Brock and Volker D. Burkert and C. Carlin and Alexandre Deur and Danning Di and James A. Dunne and P. Ekanayaka and Lamiaa El-Fassi and B. Emmich and Liping Gan and O. Glamazdin and Mohammad Lutful Kabir and A. Karki and Christopher Keith and Stanley B. Kowalski and Victoria Lagerquist and I. Larin and T. Liu and Anusha Liyanage and James D. Maxwell and D. Meekins and Sahara Jesmin Nazeer and Vladimir Nelyubin and Hung T. Nguyen and R. Pedroni and C. F. Perdrisat and J. Pierce and Vina Punjabi and Maryam Hashemi Shabestari and Albert Shahinyan and Rupesh Silwal and Stepan Stepanyan and Adesh Subedi and V. V. Tarasov and Nguyen Ton and Y. Zhang and Z. W. Zhao},
  journal={Nature},
  year={2019},
  volume={575},
  pages={147-150}
}
Elastic electron–proton scattering (e–p) and the spectroscopy of hydrogen atoms are the two methods traditionally used to determine the proton charge radius, r p. 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… 

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