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High-Precision Determination of the Electric and Magnetic Form Factors of the Proton

J. C. Bernauer, P. Achenbach, C. Ayerbe Gayoso, R. Böhm, D. Bosnar, L. Debenjak, M. O. Distler, L. Doria, A. Esser, H. Fonvieille, J. M. Friedrich, J. Friedrich, M. Gómez Rodríguez de la Paz, M. Makek, H. Merkel, D. G. Middleton, U. Müller, L. Nungesser, J. Pochodzalla, M. Potokar, S. Sánchez Majos, B. S. Schlimme, S. Širca, Th. Walcher, and M. Weinriefer (A1 Collaboration)
Phys. Rev. Lett. 105, 242001 – Published 10 December 2010
Physics logo See Synopsis: A question of size

Abstract

New precise results of a measurement of the elastic electron-proton scattering cross section performed at the Mainz Microtron MAMI are presented. About 1400 cross sections were measured with negative four-momentum transfers squared up to Q2=1(GeV/c)2 with statistical errors below 0.2%. The electric and magnetic form factors of the proton were extracted by fits of a large variety of form factor models directly to the cross sections. The form factors show some features at the scale of the pion cloud. The charge and magnetic radii are determined to be rE21/2=0.879(5)stat(4)syst(2)model(4)groupfm and rM21/2=0.777(13)stat(9)syst(5)model(2)groupfm.

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  • Received 29 July 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.242001

© 2010 The American Physical Society

Synopsis

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A question of size

Published 10 December 2010

Just how small is the proton?

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Comment on “High-Precision Determination of the Electric and Magnetic Form Factors of the Proton”

J. Arrington
Phys. Rev. Lett. 107, 119101 (2011)

Bernauer et al. Reply:

J. C. Bernauer, P. Achenbach, C. Ayerbe Gayoso, R. Böhm, D. Bosnar, L. Debenjak, M. O. Distler, L. Doria, A. Esser, H. Fonvieille, J. M. Friedrich, J. Friedrich, M. Gómez Rodríguez de la Paz, M. Makek, H. Merkel, D. G. Middleton, U. Müller, L. Nungesser, J. Pochodzalla, M. Potokar, S. Sánchez Majos, B. S. Schlimme, S. Širca, Th. Walcher, and M. Weinriefer (A1 Collaboration)
Phys. Rev. Lett. 107, 119102 (2011)

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Vol. 105, Iss. 24 — 10 December 2010

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