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 2 comparedwithpreviousresults ,whichbecameknownasthe‘protonradiuspuzzle’. Despite experimental and theoretical efforts, the puzzle remains unresolved. In fact, there is a discrepancy between the two most recent spectroscopic measurements 3,4 conducted on ordinary hydrogen . 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 the most recent high-precision e–p measurement5 and 2.7 standard 6 deviations smaller than the average of all e–p experimental results . The smaller rp we have now measured supports the value found by two previous muonic hydrogen 1,7 experiments . In addition, our finding agrees with the revised value (announced in 2019) for the Rydberg constant—one of the most accurately evaluated fundamental constants in physics.
- Authors:
-
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- Duke Univ., Durham, NC (United States)
- North Carolina A & T State Univ., Greensboro, NC (United States)
- Mississippi State Univ., Mississippi State, MS (United States)
- Idaho State Univ., Pocatello, ID (United States)
- Univ. of Virginia, Charlottesville, VA (United States)
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Duke Univ., Durham, NC (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Univ. of North Carolina, Wilmington, NC (United States)
- National Academy of Sciences of Ukraine (NASU), Kharkov (Ukraine). National Scientific Centre, Kharkov Inst. of Physics and Technology (KIPT)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Old Dominion Univ., Norfolk, VA (United States)
- National Research Centre (NRC), Moscow (Russian Federation). Kurchatov Inst. (NRCKI); Univ. of Massachusetts, Amherst, MA (United States)
- Hampton Univ., Hampton, VA (United States)
- College of William and Mary, Williamsburg, VA (United States)
- Norfolk State Univ., Norfolk, VA (United States)
- Yerevan Physics Inst. (YerPhI) (Armenia)
- National Research Centre (NRC), Moscow (Russian Federation). Kurchatov Inst. (NRCKI)
- Publication Date:
- Research Org.:
- Mississippi State Univ., Mississippi State, MS (United States); Duke Univ., Durham, NC (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Massachusetts, Amherst, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1599193
- Alternate Identifier(s):
- OSTI ID: 1577255; OSTI ID: 1659122
- Grant/Contract Number:
- FG02-07ER41528; FG02-03ER41231; PHY-1229153; AC02-06CH11357; FG02-88ER40415
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature (London)
- Additional Journal Information:
- Journal Name: Nature (London); Journal Volume: 575; Journal Issue: 7781; Journal ID: ISSN 0028-0836
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; proton charge radius; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Citation Formats
Xiong, W., Gasparian, A., Gao, H., Dutta, D., Khandaker, M., Liyanage, N., Pasyuk, E., Peng, C., Bai, X., Ye, L., Gnanvo, K., Gu, C., Levillain, M., Yan, X., Higinbotham, D. W., Meziane, M., Ye, Z., Adhikari, K., Aljawrneh, B., Bhatt, H., Bhetuwal, D., Brock, J., Burkert, V., Carlin, C., Deur, A., Di, D., Dunne, J., Ekanayaka, P., El-Fassi, L., Emmich, B., Gan, L., Glamazdin, O., Kabir, M. L., Karki, A., Keith, C., Kowalski, S., Lagerquist, V., Larin, I., Liu, T., Liyanage, A., Maxwell, J., Meekins, D., Nazeer, S. J., Nelyubin, V., Nguyen, H., Pedroni, R., Perdrisat, C., Pierce, J., Punjabi, V., Shabestari, M., Shahinyan, A., Silwal, R., Stepanyan, S., Subedi, A., Tarasov, V. V., Ton, N., Zhang, Y., and Zhao, Z. W. A small proton charge radius from an electron–proton scattering experiment. United States: N. p., 2019.
Web. doi:10.1038/s41586-019-1721-2.
Xiong, W., Gasparian, A., Gao, H., Dutta, D., Khandaker, M., Liyanage, N., Pasyuk, E., Peng, C., Bai, X., Ye, L., Gnanvo, K., Gu, C., Levillain, M., Yan, X., Higinbotham, D. W., Meziane, M., Ye, Z., Adhikari, K., Aljawrneh, B., Bhatt, H., Bhetuwal, D., Brock, J., Burkert, V., Carlin, C., Deur, A., Di, D., Dunne, J., Ekanayaka, P., El-Fassi, L., Emmich, B., Gan, L., Glamazdin, O., Kabir, M. L., Karki, A., Keith, C., Kowalski, S., Lagerquist, V., Larin, I., Liu, T., Liyanage, A., Maxwell, J., Meekins, D., Nazeer, S. J., Nelyubin, V., Nguyen, H., Pedroni, R., Perdrisat, C., Pierce, J., Punjabi, V., Shabestari, M., Shahinyan, A., Silwal, R., Stepanyan, S., Subedi, A., Tarasov, V. V., Ton, N., Zhang, Y., & Zhao, Z. W. A small proton charge radius from an electron–proton scattering experiment. United States. https://doi.org/10.1038/s41586-019-1721-2
Xiong, W., Gasparian, A., Gao, H., Dutta, D., Khandaker, M., Liyanage, N., Pasyuk, E., Peng, C., Bai, X., Ye, L., Gnanvo, K., Gu, C., Levillain, M., Yan, X., Higinbotham, D. W., Meziane, M., Ye, Z., Adhikari, K., Aljawrneh, B., Bhatt, H., Bhetuwal, D., Brock, J., Burkert, V., Carlin, C., Deur, A., Di, D., Dunne, J., Ekanayaka, P., El-Fassi, L., Emmich, B., Gan, L., Glamazdin, O., Kabir, M. L., Karki, A., Keith, C., Kowalski, S., Lagerquist, V., Larin, I., Liu, T., Liyanage, A., Maxwell, J., Meekins, D., Nazeer, S. J., Nelyubin, V., Nguyen, H., Pedroni, R., Perdrisat, C., Pierce, J., Punjabi, V., Shabestari, M., Shahinyan, A., Silwal, R., Stepanyan, S., Subedi, A., Tarasov, V. V., Ton, N., Zhang, Y., and Zhao, Z. W. Wed .
"A small proton charge radius from an electron–proton scattering experiment". United States. https://doi.org/10.1038/s41586-019-1721-2. https://www.osti.gov/servlets/purl/1599193.
@article{osti_1599193,
title = {A small proton charge radius from an electron–proton scattering experiment},
author = {Xiong, W. and Gasparian, A. and Gao, H. and Dutta, D. and Khandaker, M. and Liyanage, N. and Pasyuk, E. and Peng, C. and Bai, X. and Ye, L. and Gnanvo, K. and Gu, C. and Levillain, M. and Yan, X. and Higinbotham, D. W. and Meziane, M. and Ye, Z. and Adhikari, K. and Aljawrneh, B. and Bhatt, H. and Bhetuwal, D. and Brock, J. and Burkert, V. and Carlin, C. and Deur, A. and Di, D. and Dunne, J. and Ekanayaka, P. and El-Fassi, L. and Emmich, B. and Gan, L. and Glamazdin, O. and Kabir, M. L. and Karki, A. and Keith, C. and Kowalski, S. and Lagerquist, V. and Larin, I. and Liu, T. and Liyanage, A. and Maxwell, J. and Meekins, D. and Nazeer, S. J. and Nelyubin, V. and Nguyen, H. and Pedroni, R. and Perdrisat, C. and Pierce, J. and Punjabi, V. and Shabestari, M. and Shahinyan, A. and Silwal, R. and Stepanyan, S. and Subedi, A. and Tarasov, V. V. and Ton, N. and Zhang, Y. and Zhao, Z. W.},
abstractNote = {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 2 comparedwithpreviousresults ,whichbecameknownasthe‘protonradiuspuzzle’. Despite experimental and theoretical efforts, the puzzle remains unresolved. In fact, there is a discrepancy between the two most recent spectroscopic measurements 3,4 conducted on ordinary hydrogen . 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 the most recent high-precision e–p measurement5 and 2.7 standard 6 deviations smaller than the average of all e–p experimental results . The smaller rp we have now measured supports the value found by two previous muonic hydrogen 1,7 experiments . In addition, our finding agrees with the revised value (announced in 2019) for the Rydberg constant—one of the most accurately evaluated fundamental constants in physics.},
doi = {10.1038/s41586-019-1721-2},
journal = {Nature (London)},
number = 7781,
volume = 575,
place = {United States},
year = {Wed Nov 06 00:00:00 EST 2019},
month = {Wed Nov 06 00:00:00 EST 2019}
}
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Works referenced in this record:
Consistency of electron scattering data with a small proton radius
journal, June 2016
- Griffioen, Keith; Carlson, Carl; Maddox, Sarah
- Physical Review C, Vol. 93, Issue 6
The size of the proton: From the Lamb-shift in muonic hydrogen
journal, October 2011
- Nebel, T.; Antognini, A.; Amaro, F. D.
- Hyperfine Interactions, Vol. 212, Issue 1-3
Extraction of the proton radius from electron-proton scattering data
journal, July 2015
- Lee, Gabriel; Arrington, John R.; Hill, Richard J.
- Physical Review D, Vol. 92, Issue 1
A high Performance Hybrid Electromagnetic Calorimeter at Jefferson lab
conference, January 2012
- Gasparian, A.
- Proceedings of the Eleventh International Conference, Calorimetry in Particle Physics
The Rydberg constant and proton size from atomic hydrogen
journal, October 2017
- Beyer, Axel; Maisenbacher, Lothar; Matveev, Arthur
- Science, Vol. 358, Issue 6359
The CEBAF large acceptance spectrometer (CLAS)
journal, May 2003
- Mecking, B. A.; Adams, G.; Ahmad, S.
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 503, Issue 3
Realistic transverse images of the proton charge and magnetization densities
journal, January 2011
- Venkat, Siddharth; Arrington, John; Miller, Gerald A.
- Physical Review C, Vol. 83, Issue 1
High-Precision Determination of the Electric and Magnetic Form Factors of the Proton
journal, December 2010
- Bernauer, J. C.; Achenbach, P.; Ayerbe Gayoso, C.
- Physical Review Letters, Vol. 105, Issue 24
Proton charge radius extraction from electron scattering data using dispersively improved chiral effective field theory
journal, April 2019
- Alarcón, J. M.; Higinbotham, D. W.; Weiss, C.
- Physical Review C, Vol. 99, Issue 4
Proton radius from electron scattering data
journal, May 2016
- Higinbotham, Douglas W.; Kabir, Al Amin; Lin, Vincent
- Physical Review C, Vol. 93, Issue 5
Proton Structure from the Measurement of 2S-2P Transition Frequencies of Muonic Hydrogen
journal, January 2013
- Antognini, A.; Nez, F.; Schuhmann, K.
- Science, Vol. 339, Issue 6118
Empirical fit to precision inclusive electron-proton cross sections in the resonance region
journal, May 2010
- Christy, M. E.; Bosted, P. E.
- Physical Review C, Vol. 81, Issue 5
The size of the proton
journal, July 2010
- Pohl, Randolf; Antognini, Aldo; Nez, François
- Nature, Vol. 466, Issue 7303
The proton radius puzzle
journal, May 2015
- Carlson, Carl E.
- Progress in Particle and Nuclear Physics, Vol. 82
Validity of the Weizsäcker-Williams approximation and the analysis of beam dump experiments: Production of an axion, a dark photon, or a new axial-vector boson
journal, July 2017
- Liu, Yu-Sheng; Miller, Gerald A.
- Physical Review D, Vol. 96, Issue 1
Robust extraction of the proton charge radius from electron-proton scattering data
journal, August 2018
- Yan, Xuefei; Higinbotham, Douglas W.; Dutta, Dipangkar
- Physical Review C, Vol. 98, Issue 2
High-precision determination of the electric and magnetic form factors of the proton
conference, January 2011
- Bernauer, Jan C.; Hosaka, Atsushi; Khemchandani, Kanchan
- INTERNATIONAL CONFERENCE ON THE STRUCTURE OF BARYONS (BARYONS' 10), AIP Conference Proceedings
Computing the nucleon charge and axial radii directly at in lattice QCD
journal, February 2018
- Hasan, Nesreen; Green, Jeremy; Meinel, Stefan
- Physical Review D, Vol. 97, Issue 3
Theory of the 2S–2P Lamb shift and 2S hyperfine splitting in muonic hydrogen
journal, April 2013
- Antognini, Aldo; Kottmann, Franz; Biraben, François
- Annals of Physics, Vol. 331
Defining the proton radius: A unified treatment
journal, March 2019
- Miller, Gerald A.
- Physical Review C, Vol. 99, Issue 3
CODATA recommended values of the fundamental physical constants: 2006
journal, June 2008
- Mohr, Peter J.; Taylor, Barry N.; Newell, David B.
- Reviews of Modern Physics, Vol. 80, Issue 2
Simple parametrization of nucleon form factors
journal, December 2004
- Kelly, J. J.
- Physical Review C, Vol. 70, Issue 6
CODATA Recommended Values of the Fundamental Physical Constants: 2014
journal, December 2016
- Mohr, Peter J.; Newell, David B.; Taylor, Barry N.
- Journal of Physical and Chemical Reference Data, Vol. 45, Issue 4
Geant4—a simulation toolkit
journal, July 2003
- Agostinelli, S.; Allison, J.; Amako, K.
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 506, Issue 3
Radiative corrections beyond the ultra relativistic limit in unpolarized ep elastic and Møller scatterings for the PRad Experiment at Jefferson Laboratory
journal, January 2015
- Akushevich, I.; Gao, H.; Ilyichev, A.
- The European Physical Journal A, Vol. 51, Issue 1
A new event generator for the elastic scattering of charged leptons on protons
journal, September 2014
- Gramolin, A. V.; Fadin, V. S.; Feldman, A. L.
- Journal of Physics G: Nuclear and Particle Physics, Vol. 41, Issue 11
Proton polarizability contribution: Muonic hydrogen Lamb shift and elastic scattering
journal, January 2013
- Miller, Gerald A.
- Physics Letters B, Vol. 718, Issue 3
CODATA recommended values of the fundamental physical constants: 2010
journal, November 2012
- Mohr, Peter J.; Taylor, Barry N.; Newell, David B.
- Reviews of Modern Physics, Vol. 84, Issue 4
New Measurement of the Transition Frequency of Hydrogen: Contribution to the Proton Charge Radius Puzzle
journal, May 2018
- Fleurbaey, Hélène; Galtier, Sandrine; Thomas, Simon
- Physical Review Letters, Vol. 120, Issue 18
CODATA recommended values of the fundamental physical constants: 2006
journal, September 2008
- Mohr, Peter J.; Taylor, Barry N.; Newell, David B.
- Journal of Physical and Chemical Reference Data, Vol. 37, Issue 3
Computing the nucleon charge and axial radii directly at $Q^2=0$ in lattice QCD
text, January 2018
- Hasan, Nesreen; Green, Jeremy; Meinel, Stefan
- Deutsches Elektronen-Synchrotron, DESY, Hamburg
Codata Recommended Values Of The Fundamental Physical Constants: 2014
text, January 2015
- Mohr, Peter J.; Newell, David B.; Taylor, Barry N.
- Zenodo
CODATA Recommended Values of the Fundamental Physical Constants: 2010
journal, December 2012
- Mohr, Peter J.; Taylor, Barry N.; Newell, David B.
- Journal of Physical and Chemical Reference Data, Vol. 41, Issue 4
CODATA Recommended Values of the Fundamental Physical Constants: 2006
text, January 2008
- Mohr, Peter J.; Taylor, Barry N.; Newell, David B.
- arXiv
High-precision determination of the electric and magnetic form factors of the proton
text, January 2010
- Bernauer, J. C.; Achenbach, P.; Gayoso, C. Ayerbe
- arXiv
Proton Polarizability Contribution: Muonic Hydrogen Lamb Shift and Elastic Scattering
text, January 2012
- Miller, Gerald A.
- arXiv
A new event generator for the elastic scattering of charged leptons on protons
text, January 2014
- Gramolin, A. V.; Fadin, V. S.; Feldman, A. L.
- arXiv
Robust extraction of proton charge radius from electron-proton scattering data
text, January 2018
- Yan, Xuefei; Higinbotham, Douglas W.; Dutta, Dipangkar
- arXiv
Proton charge radius extraction from electron scattering data using dispersively improved chiral effective field theory
text, January 2018
- Alarcón, J. M.; Higinbotham, D. W.; Weiss, C.
- arXiv
Works referencing / citing this record:
Muonic Lithium atoms: nuclear structure corrections to the Lamb shift
journal, January 2020
- Li Muli, Simone Salvatore; Poggialini, Anna; Bacca, Sonia
- SciPost Physics Proceedings, Issue 3
Hyperfine structure of states in muonic ions of lithium, beryllium, and boron
journal, December 2019
- Dorokhov, A. E.; Martynenko, A. P.; Martynenko, F. A.
- Physical Review A, Vol. 100, Issue 6