Measurements of the nucleon form factors at large momentum transfers

Conference · Tue Dec 01 04:00:00 EST 1992

DOI:https://doi.org/10.2172/10122483· OSTI ID:6887056

Andivahis, L; Bosted, P; Lung, A; Arnold, R; Keppel, C; Rock, S; Spengos, M; Szalata, Z; Tao, L ^[1]; Stuart, L; Dietrich, F ^[2]; Alster, J; Lichtenstadt, J ^[3]; Chang, C ^[4]; Dodge, W ^[5]

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1. American Univ., Washington, DC (United States)
2. Lawrence Livermore National Lab., CA (United States)
3. Tel Aviv Univ. (Israel)
4. Maryland Univ., College Park, MD (United States)
5. National Bureau of Standards, Gaithersburg,

New measurements of the electric G[sub E](Q[sup 2]) and magnetic G[sub M](Q[sup 2]) form factors of the nucleons are reported. The proton data cover the Q[sup 2] range from 1.75 to 8.83 (GeV/c)[sup 2] and the neutron data from 1.75 to 4.00 (GeV/c)[sup 2], more than doubling the range of previous data. Scaled by the dipole fit, G[sub D](Q[sup 2]), the results for G[sub Mp](Q[sup 2])/[mu][sub p]G[sub D](Q[sup 2]) decrease smoothly from 1.05 to 0.92, while G[sub Ep](Q[sup 2])/G[sub D](Q[sup 2]) is consistent with unity. The preliminary results for Gm.(Q2)1 GD(Q2) consistent with unity, while F[sub En][sup 2] is consistent with zero at all values of Q[sup 2]. Comparisons are made to QCD Sum Rule, diquark, constituent quark, and VMD models, none of which agree with all of the new data.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (United States)
• Sponsoring Organization: DOE; NSF; USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00515; W-7405-ENG-48; FG02-88ER40415; AC02-76ER13065; FG06-90ER40537
• OSTI ID: 6887056
• Report Number(s): SLAC-PUB-5867; UR--1277; CONF-920708--6; ON: DE93006931; CNN: PHY-87-15050; PHY-89-18491; PHY-88-19259; PHY-86-58127
• Country of Publication: United States
• Language: English

Related Subjects

662410* -- Properties of Baryons & Baryon Resonances-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
DATA
ELECTROMAGNETIC FORM FACTORS
ELEMENTARY PARTICLES
EQUATIONS
EXPERIMENTAL DATA
FERMIONS
FIELD THEORIES
FORM FACTORS
HADRONS
INFORMATION
MEASURING METHODS
MOMENTUM TRANSFER
NUCLEONS
NUMERICAL DATA
PARTICLE PROPERTIES
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SUM RULES