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

Journal Article · Fri Dec 10 00:00:00 EST 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.105.242001· OSTI ID:21554460

Bernauer, J C; Achenbach, P; Ayerbe Gayoso, C; Boehm, R; Distler, M O; Doria, L; Esser, A; Friedrich, J; Merkel, H; Middleton, D G; Mueller, U; Nungesser, L; Pochodzalla, J; Sanchez Majos, S; Schlimme, B S; Walcher, Th; Weinriefer, M ^[1]; Bosnar, D; Makek, M ^[2]

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1. Institut fuer Kernphysik, Johannes Gutenberg-Universitaet Mainz, 55099 Mainz (Germany)
2. Department of Physics, University of Zagreb, 10002 Zagreb (Croatia)

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 Q{sup 2}=1 (GeV/c){sup 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 <r{sub E}{sup 2}>{sup 1/2}=0.879(5){sub stat}(4){sub syst}(2){sub model}(4){sub group} fm and <r{sub M}{sup 2}>{sup 1/2}=0.777(13){sub stat}(9){sub syst}(5){sub model}(2){sub group} fm.

• OSTI ID: 21554460
• Journal Information: Physical Review Letters, Vol. 105, Issue 24; Other Information: DOI: 10.1103/PhysRevLett.105.242001; (c) 2010 American Institute of Physics; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCURACY
CROSS SECTIONS
ELECTRON-PROTON INTERACTIONS
ERRORS
FORM FACTORS
FOUR MOMENTUM TRANSFER
GEV RANGE 01-10
MAGNETIC FORMING
PIONS
PROTONS
BARYONS
BOSONS
DIMENSIONLESS NUMBERS
ELECTRON-NUCLEON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FABRICATION
FERMIONS
GEV RANGE
HADRONS
INTERACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
MATERIALS WORKING
MESONS
MOMENTUM TRANSFER
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PSEUDOSCALAR MESONS