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Title: Proton form factor ratio μ p G E p / G M p from double spin asymmetry

Abstract

The ratio of the electric and magnetic form factor of the proton, $$\mu_p G_E^p/G_M^p$$, has been measured for elastic electron-proton scattering with polarized beam and target up to four-momentum transfer squared, $Q^2=5.66$ (GeV/c)$^2$ using the double spin asymmetry for target spin orientation aligned nearly perpendicular to the beam momentum direction. This measurement of $$\mu_p G_E^p/G_M^p$$ agrees with the $Q^2$ dependence of previous recoil polarization data and reconfirms the discrepancy at high $Q^2$ between the Rosenbluth and the polarization-transfer method with a different measurement technique and systematic uncertainties uncorrelated to those of the recoil-polarization measurements. The form factor ratio at $Q^2$=2.06 (GeV/c)$^2$ has been measured as $$\mu_p G_E^p/G_M^p = 0.720 \pm 0.176_{stat} \pm 0.039_{sys}$$, which is in agreement with an earlier measurement with the polarized target technique at similar kinematics. The form factor ratio at $Q^2$=5.66 (GeV/c)$^2$ has been determined as $$\mu_p G_E^p/G_M^p=0.244\pm0.353_{stat}\pm0.013_{sys}$$, which represents the highest $Q^2$ reach with the double spin asymmetry with polarized target to date.

Authors:
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Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Org.:
[SANE Collaboration]
OSTI Identifier:
1605544
Alternate Identifier(s):
OSTI ID: 1604858
Report Number(s):
[JLAB-PHY-20-3164; DOE/OR/23177-4944; arXiv:1806.11156]
[Journal ID: ISSN 2469-9985; PRVCAN]
Grant/Contract Number:  
[SC0003884; SC-0013941; FG02-96ER40950; AC05-06OR23177; PHY-0855473; PHY-1207672; HRD-1649909]
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
[ Journal Volume: 101; Journal Issue: 3]; Journal ID: ISSN 2469-9985
Country of Publication:
United States
Language:
English

Citation Formats

Liyanage, A., Armstrong, W., Kang, H., Maxwell, J., Mulholland, J., Ndukum, L., Ahmidouch, A., Albayrak, I., Asaturyan, A., Ates, O., Baghdasaryan, H., Boeglin, W., Bosted, P., Brash, E., Butuceanu, C., Bychkov, M., Carter, P., Chen, C., Chen, J. -P., Choi, S., Christy, E., Covrig, S., Crabb, D., Danagoulian, S., Daniel, A., Davidenko, A. M., Davis, B., Day, D., Deconinck, W., Deur, A., Dunne, J., Dutta, D., Fassi, L. El, Elaasar, M., Ellis, C., Ent, R., Flay, D., Frlez, E., Gaskell, D., Geagla, O., German, J., Gilman, R., Gogami, T., Gomez, J., Goncharenko, Y. M., Hashimoto, O., Higinbotham, D., Horn, T., Huber, G. M., Jones, M., Jones, M. K., Kalantarians, N., Kang, H. -K., Kawama, D., Keppel, C., Khandaker, M., Kim, Y., King, P. M., Kohl, M., Kovacs, K., Kubarovsky, V., Li, Y., Liyanage, N., Mamyan, V., Markowitz, P., Maruta, T., Melnik, Y. M., Meziani, Z. -E., Mkrtchyan, A., Mkrtchyan, H., Mochalov, V. V., Monaghan, P., Narayan, A., Nakamura, S. N., Nuruzzaman,, Pentchev, L., Pocanic, D., Posik, M., Puckett, A., Qiu, X., Reinhold, J., Riordan, S., Roche, J., Rondón, O. A., Sawatzky, B., Shabestari, M., Slifer, K., Smith, G., Soloviev, L. F., Solvignon, P., Tadevosyan, V., Tang, L., Vasiliev, A. N., Veilleux, M., Walton, T., Wesselmann, F., Wood, S. A., Yao, H., Ye, Z., and Zhu, L. Proton form factor ratio μpGEp/GMp from double spin asymmetry. United States: N. p., 2020. Web. doi:10.1103/PhysRevC.101.035206.
Liyanage, A., Armstrong, W., Kang, H., Maxwell, J., Mulholland, J., Ndukum, L., Ahmidouch, A., Albayrak, I., Asaturyan, A., Ates, O., Baghdasaryan, H., Boeglin, W., Bosted, P., Brash, E., Butuceanu, C., Bychkov, M., Carter, P., Chen, C., Chen, J. -P., Choi, S., Christy, E., Covrig, S., Crabb, D., Danagoulian, S., Daniel, A., Davidenko, A. M., Davis, B., Day, D., Deconinck, W., Deur, A., Dunne, J., Dutta, D., Fassi, L. El, Elaasar, M., Ellis, C., Ent, R., Flay, D., Frlez, E., Gaskell, D., Geagla, O., German, J., Gilman, R., Gogami, T., Gomez, J., Goncharenko, Y. M., Hashimoto, O., Higinbotham, D., Horn, T., Huber, G. M., Jones, M., Jones, M. K., Kalantarians, N., Kang, H. -K., Kawama, D., Keppel, C., Khandaker, M., Kim, Y., King, P. M., Kohl, M., Kovacs, K., Kubarovsky, V., Li, Y., Liyanage, N., Mamyan, V., Markowitz, P., Maruta, T., Melnik, Y. M., Meziani, Z. -E., Mkrtchyan, A., Mkrtchyan, H., Mochalov, V. V., Monaghan, P., Narayan, A., Nakamura, S. N., Nuruzzaman,, Pentchev, L., Pocanic, D., Posik, M., Puckett, A., Qiu, X., Reinhold, J., Riordan, S., Roche, J., Rondón, O. A., Sawatzky, B., Shabestari, M., Slifer, K., Smith, G., Soloviev, L. F., Solvignon, P., Tadevosyan, V., Tang, L., Vasiliev, A. N., Veilleux, M., Walton, T., Wesselmann, F., Wood, S. A., Yao, H., Ye, Z., & Zhu, L. Proton form factor ratio μpGEp/GMp from double spin asymmetry. United States. doi:10.1103/PhysRevC.101.035206.
Liyanage, A., Armstrong, W., Kang, H., Maxwell, J., Mulholland, J., Ndukum, L., Ahmidouch, A., Albayrak, I., Asaturyan, A., Ates, O., Baghdasaryan, H., Boeglin, W., Bosted, P., Brash, E., Butuceanu, C., Bychkov, M., Carter, P., Chen, C., Chen, J. -P., Choi, S., Christy, E., Covrig, S., Crabb, D., Danagoulian, S., Daniel, A., Davidenko, A. M., Davis, B., Day, D., Deconinck, W., Deur, A., Dunne, J., Dutta, D., Fassi, L. El, Elaasar, M., Ellis, C., Ent, R., Flay, D., Frlez, E., Gaskell, D., Geagla, O., German, J., Gilman, R., Gogami, T., Gomez, J., Goncharenko, Y. M., Hashimoto, O., Higinbotham, D., Horn, T., Huber, G. M., Jones, M., Jones, M. K., Kalantarians, N., Kang, H. -K., Kawama, D., Keppel, C., Khandaker, M., Kim, Y., King, P. M., Kohl, M., Kovacs, K., Kubarovsky, V., Li, Y., Liyanage, N., Mamyan, V., Markowitz, P., Maruta, T., Melnik, Y. M., Meziani, Z. -E., Mkrtchyan, A., Mkrtchyan, H., Mochalov, V. V., Monaghan, P., Narayan, A., Nakamura, S. N., Nuruzzaman,, Pentchev, L., Pocanic, D., Posik, M., Puckett, A., Qiu, X., Reinhold, J., Riordan, S., Roche, J., Rondón, O. A., Sawatzky, B., Shabestari, M., Slifer, K., Smith, G., Soloviev, L. F., Solvignon, P., Tadevosyan, V., Tang, L., Vasiliev, A. N., Veilleux, M., Walton, T., Wesselmann, F., Wood, S. A., Yao, H., Ye, Z., and Zhu, L. Sun . "Proton form factor ratio μpGEp/GMp from double spin asymmetry". United States. doi:10.1103/PhysRevC.101.035206.
@article{osti_1605544,
title = {Proton form factor ratio μpGEp/GMp from double spin asymmetry},
author = {Liyanage, A. and Armstrong, W. and Kang, H. and Maxwell, J. and Mulholland, J. and Ndukum, L. and Ahmidouch, A. and Albayrak, I. and Asaturyan, A. and Ates, O. and Baghdasaryan, H. and Boeglin, W. and Bosted, P. and Brash, E. and Butuceanu, C. and Bychkov, M. and Carter, P. and Chen, C. and Chen, J. -P. and Choi, S. and Christy, E. and Covrig, S. and Crabb, D. and Danagoulian, S. and Daniel, A. and Davidenko, A. M. and Davis, B. and Day, D. and Deconinck, W. and Deur, A. and Dunne, J. and Dutta, D. and Fassi, L. El and Elaasar, M. and Ellis, C. and Ent, R. and Flay, D. and Frlez, E. and Gaskell, D. and Geagla, O. and German, J. and Gilman, R. and Gogami, T. and Gomez, J. and Goncharenko, Y. M. and Hashimoto, O. and Higinbotham, D. and Horn, T. and Huber, G. M. and Jones, M. and Jones, M. K. and Kalantarians, N. and Kang, H. -K. and Kawama, D. and Keppel, C. and Khandaker, M. and Kim, Y. and King, P. M. and Kohl, M. and Kovacs, K. and Kubarovsky, V. and Li, Y. and Liyanage, N. and Mamyan, V. and Markowitz, P. and Maruta, T. and Melnik, Y. M. and Meziani, Z. -E. and Mkrtchyan, A. and Mkrtchyan, H. and Mochalov, V. V. and Monaghan, P. and Narayan, A. and Nakamura, S. N. and Nuruzzaman, and Pentchev, L. and Pocanic, D. and Posik, M. and Puckett, A. and Qiu, X. and Reinhold, J. and Riordan, S. and Roche, J. and Rondón, O. A. and Sawatzky, B. and Shabestari, M. and Slifer, K. and Smith, G. and Soloviev, L. F. and Solvignon, P. and Tadevosyan, V. and Tang, L. and Vasiliev, A. N. and Veilleux, M. and Walton, T. and Wesselmann, F. and Wood, S. A. and Yao, H. and Ye, Z. and Zhu, L.},
abstractNote = {The ratio of the electric and magnetic form factor of the proton, $\mu_p G_E^p/G_M^p$, has been measured for elastic electron-proton scattering with polarized beam and target up to four-momentum transfer squared, $Q^2=5.66$ (GeV/c)$^2$ using the double spin asymmetry for target spin orientation aligned nearly perpendicular to the beam momentum direction. This measurement of $\mu_p G_E^p/G_M^p$ agrees with the $Q^2$ dependence of previous recoil polarization data and reconfirms the discrepancy at high $Q^2$ between the Rosenbluth and the polarization-transfer method with a different measurement technique and systematic uncertainties uncorrelated to those of the recoil-polarization measurements. The form factor ratio at $Q^2$=2.06 (GeV/c)$^2$ has been measured as $\mu_p G_E^p/G_M^p = 0.720 \pm 0.176_{stat} \pm 0.039_{sys}$, which is in agreement with an earlier measurement with the polarized target technique at similar kinematics. The form factor ratio at $Q^2$=5.66 (GeV/c)$^2$ has been determined as $\mu_p G_E^p/G_M^p=0.244\pm0.353_{stat}\pm0.013_{sys}$, which represents the highest $Q^2$ reach with the double spin asymmetry with polarized target to date.},
doi = {10.1103/PhysRevC.101.035206},
journal = {Physical Review C},
number = [3],
volume = [101],
place = {United States},
year = {2020},
month = {3}
}

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Works referenced in this record:

High Energy Elastic Scattering of Electrons on Protons
journal, August 1950


Polarization transfer in elastic electron scattering from nucleons and deuterons
journal, January 1981

  • Arnold, Raymond G.; Carlson, Carl E.; Gross, Franz
  • Physical Review C, Vol. 23, Issue 1
  • DOI: 10.1103/PhysRevC.23.363

Scattering of Polarized Leptons at High Energy
journal, January 1969


Considerations of polarization in inclusive electron scattering from nuclei
journal, July 1986


Precision Rosenbluth Measurement of the Proton Elastic Form Factors
journal, April 2005


Measurements of electron-proton elastic cross sections for 0.4 < Q 2 < 5.5 ( GeV c ) 2
journal, July 2004


Measurements of the electric and magnetic form factors of the proton from Q 2 =1.75 to 8.83 (GeV/ c ) 2
journal, November 1994


Measurements of the proton elastic form factors for 1 Q 2 3 ( G e V / c ) 2 at SLAC
journal, June 1994


Electromagnetic form factors of the peoton at low four-momentum transfer (II)
journal, July 1975


Electromagnetic form factors of the proton at low four-momentum transfer
journal, April 1974


Measurement of proton and neutron electromagnetic form factors at squared four-momentum transfers up to 3 (GeV/c)2
journal, July 1973


Electromagnetic form factors of the proton at squared four-momentum transfers between 10 and 50 fm−2
journal, April 1971


Measurement of the ratio of the proton form factors, GE/GM, at high momentum transfers and the question of scaling
journal, January 1970


Proton Form Factors from Elastic Electron-Proton Scattering
journal, February 1966


Search for Effects Beyond the Born Approximation in Polarization Transfer Observables in e p Elastic Scattering
journal, March 2011


Recoil Polarization Measurements of the Proton Electromagnetic Form Factor Ratio to Q 2 = 8.5 GeV 2
journal, June 2010


Polarization Transfer in the He 4 ( e , e p ) H 3 Reaction at Q 2 = 0.8 and 1.3 ( GeV / c ) 2
journal, August 2010


Measurements of the Proton Elastic-Form-Factor Ratio μ p G E p / G M p at Low Momentum Transfer
journal, November 2007


Polarization transfer in the H 2 ( e , e p ) n reaction up to Q 2 = 1.61 ( GeV / c ) 2
journal, June 2006


The ratio of proton electromagnetic form factors via recoil polarimetry at
journal, January 2006


Proton elastic form factor ratios to Q 2 = 3.5 GeV 2 by polarization transfer
journal, May 2005


Publisher's Note: Proton elastic form factor ratios to Q 2 = 3.5 GeV 2 by polarization transfer [Phys. Rev. C 71, 055202 (2005)]
journal, June 2005


Polarization Transfer in the H e 4 ( e , e p ) H 3 Reaction up to Q 2 = 2.6     ( G e V / c ) 2
journal, July 2003


Measurement of G E p / G M p in e p e p to Q 2 = 5.6 GeV 2
journal, February 2002


Measurements of the elastic electromagnetic form factor ratio μ p G Ep / G Mp via polarization transfer
journal, August 2001


Polarization transfer in the 4HeH reaction
journal, February 2001


Measurement of GEp/GMp via polarization transfer at Q2 = 0.4 GeV /c2
journal, September 2001

  • Pospischil, Th.; Bartsch, P.; Baumann, D.
  • The European Physical Journal A, Vol. 12, Issue 1
  • DOI: 10.1007/s100500170046

G E p / G M p Ratio by Polarization Transfer in e p e p
journal, February 2000


Comparison of Polarization Observables in Electron Scattering from the Proton and Deuteron
journal, January 1998


Erratum: Comparison of Polarization Observables in Electron Scattering from the Proton and Deuteron [Phys. Rev. Lett. 80, 452 (1998)]
journal, March 1999


Polarization transfer observables in elastic electron-proton scattering at Q 2 = 2.5 , 5.2, 6.8, and 8.5   GeV 2
journal, November 2017


Final analysis of proton form factor ratio data at Q 2 = 4.0 , 4.8, and 5.6 GeV 2
journal, April 2012


Proton G E / G M from beam-target asymmetry
journal, September 2006


Measurement of the Proton’s Electric to Magnetic Form Factor Ratio from H 1 ( e , e p )
journal, January 2007


Simple parametrization of nucleon form factors
journal, December 2004


Thermalization of hadrons via Hagedorn states
journal, October 2014


How to Reconcile the Rosenbluth and the Polarization Transfer Methods in the Measurement of the Proton Form Factors
journal, October 2003


Two-Photon Exchange and Elastic Electron-Proton Scattering
journal, October 2003


Model-independent properties of two-photon exchange in elastic electron-proton scattering
journal, November 2004


Partonic Calculation of the Two-Photon Exchange Contribution to Elastic Electron-Proton Scattering at Large Momentum Transfer
journal, September 2004


Two-photon exchange contribution to elastic electron-nucleonscattering at large momentum transfer
journal, July 2005


Two-photon exchange in elastic electron-nucleon scattering
journal, September 2005


Box diagram in the elastic electron-proton scattering
journal, December 2006


Two-photon exchange in a dispersion approach
journal, August 2008


Perturbative QCD predictions for two-photon exchange
journal, February 2009


Two-Photon Exchange in Elastic Electron-Proton Scattering: A QCD Factorization Approach
journal, August 2009


Δ Resonance Contribution to Two-Photon Exchange in Electron-Proton Scattering
journal, October 2005


Charge asymmetry for electron (positron)-proton elastic scattering at large angles
journal, July 2008


Form factor ratio from unpolarized elastic electron-proton scattering
journal, November 2016


Towards a Resolution of the Proton Form Factor Problem: New Electron and Positron Scattering Data
journal, February 2015


Measurement of two-photon exchange effect by comparing elastic e ± p cross sections
journal, June 2017


Measurement of the Two-Photon Exchange Contribution to the Elastic e ± p Scattering Cross Sections at the VEPP-3 Storage Ring
journal, February 2015


Hard Two-Photon Contribution to Elastic Lepton-Proton Scattering Determined by the OLYMPUS Experiment
journal, March 2017


Proton Spin Structure in the Resonance Region
journal, March 2007


Revealing Color Forces with Transverse Polarized Electron Scattering
journal, January 2019


T HE C ONTINUOUS E LECTRON B EAM A CCELERATOR F ACILITY : CEBAF at the Jefferson Laboratory
journal, December 2001


A high-precision polarimeter
journal, April 2001

  • Hauger, M.; Honegger, A.; Jourdan, J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 462, Issue 3
  • DOI: 10.1016/S0168-9002(01)00197-8

Target raster system at CEBAF
journal, November 1995

  • Yan, C.; Adderley, P.; Carlini, R.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 365, Issue 1
  • DOI: 10.1016/0168-9002(95)00504-8

Linear beam raster for cryogenic targets
journal, February 2005

  • Yan, C.; Sinkine, N.; Wojcik, R.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 539, Issue 1-2
  • DOI: 10.1016/j.nima.2004.09.034

Design and performance of the spin asymmetries of the nucleon experiment
journal, March 2018

  • Maxwell, J. D.; Armstrong, W. R.; Choi, S.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 885
  • DOI: 10.1016/j.nima.2017.12.008

A solid polarized target for high-luminosity experiments
journal, May 1999

  • Averett, T. D.; Crabb, D. G.; Day, D. B.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 427, Issue 3
  • DOI: 10.1016/S0168-9002(98)01431-4

Solid Polarized Targets for Nuclear and Particle Physics Experiments
journal, December 1997


Dynamically polarized target for the and experiments at Jefferson Lab
journal, February 2014

  • Pierce, J.; Maxwell, J.; Badman, T.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 738
  • DOI: 10.1016/j.nima.2013.12.016

Empirical fit to inelastic electron-deuteron and electron-neutron resonance region transverse cross sections
journal, June 2008


Empirical fit to the nucleon electromagnetic form factors
journal, January 1995