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Elastic positron–proton scattering at low Q 2

Publication ,  Journal Article
Hague, TJ; Dutta, D; Higinbotham, DW; Bai, X; Gao, H; Gasparian, A; Gnanvo, K; Khachatryan, V; Khandaker, M; Liyanage, N; Pasyuk, E; Peng, C ...
Published in: European Physical Journal A
June 1, 2021

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 Q2 = 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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Published In

European Physical Journal A

DOI

EISSN

1434-601X

ISSN

1434-6001

Publication Date

June 1, 2021

Volume

57

Issue

6

Related Subject Headings

  • Nuclear & Particles Physics
  • 5110 Synchrotrons and accelerators
  • 5107 Particle and high energy physics
  • 5106 Nuclear and plasma physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
 

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Hague, T. J., Dutta, D., Higinbotham, D. W., Bai, X., Gao, H., Gasparian, A., … Zhou, J. (2021). Elastic positron–proton scattering at low Q 2. European Physical Journal A, 57(6). https://doi.org/10.1140/epja/s10050-021-00508-6
Hague, T. J., D. Dutta, D. W. Higinbotham, X. Bai, H. Gao, A. Gasparian, K. Gnanvo, et al. “Elastic positron–proton scattering at low Q 2.” European Physical Journal A 57, no. 6 (June 1, 2021). https://doi.org/10.1140/epja/s10050-021-00508-6.
Hague TJ, Dutta D, Higinbotham DW, Bai X, Gao H, Gasparian A, et al. Elastic positron–proton scattering at low Q 2. European Physical Journal A. 2021 Jun 1;57(6).
Hague, T. J., et al. “Elastic positron–proton scattering at low Q 2.” European Physical Journal A, vol. 57, no. 6, June 2021. Scopus, doi:10.1140/epja/s10050-021-00508-6.
Hague TJ, Dutta D, Higinbotham DW, Bai X, Gao H, Gasparian A, Gnanvo K, Khachatryan V, Khandaker M, Liyanage N, Pasyuk E, Peng C, Xiong W, Zhou J. Elastic positron–proton scattering at low Q 2. European Physical Journal A. 2021 Jun 1;57(6).
Journal cover image

Published In

European Physical Journal A

DOI

EISSN

1434-601X

ISSN

1434-6001

Publication Date

June 1, 2021

Volume

57

Issue

6

Related Subject Headings

  • Nuclear & Particles Physics
  • 5110 Synchrotrons and accelerators
  • 5107 Particle and high energy physics
  • 5106 Nuclear and plasma physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics