Measurements of the Generalized Electric and Magnetic Polarizabilities of the Proton at Low Q2 Using the VCS Reaction

Abstract

The mean square polarizability radii of the proton have been measured for the first time in a virtual Compton scattering experiment performed at the MIT-Bates out-of-plane scattering facility. Response functions and polarizabilities obtained from a dispersion analysis of the data at Q2=0.06 GeV2/c2 are in agreement with O(p3) heavy baryon chiral perturbation theory. The data support the dominance of mesonic effects in the polarizabilities, and the increase of beta with increasing Q2 is evidence for the cancellation of long-range diamagnetism by short-range paramagnetism from the pion cloud.

References in corpus (3)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Polarizability of the Nucleon and Compton Scattering
• Measurement of the Generalized Polarizabilities of the Proton in Virtual Compton Scattering at Q2= 0.92 and 1.76 GeV2

Cited by in corpus (30)

• The Present and Future of QCD
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• Hadron Polarizabilities
• Dispersion Theory in Electromagnetic Interactions
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• Light-front interpretation of Proton Generalized Polarizabilities
• Electromagnetic form factors of the $\Lambda$ and $\Sigma$ baryons in an alternative baryonic current approach
• Virtual Compton Scattering and the Generalized Polarizabilities of the Proton at Q^2=0.92 and 1.76 GeV^2
• Generalized polarizabilities of the nucleon in baryon chiral perturbation theory
• Sum rules across the unpolarized Compton processes involving generalized polarizabilities and moments of nucleon structure functions
• Beam-helicity asymmetry in photon and pion electroproduction in the Delta(1232) resonance region at Q^2= 0.35 (GeV/c)^2
• Virtual Compton Scattering measurements in the ${\gamma }^{\ast }N\to \Delta$ transition
• Measured proton electromagnetic structure deviates from theoretical predictions
• Light-cone QCD Sum Rules for the $\Lambda$ Baryon Electromagnetic Form Factors and its magnetic moment
• Real and Virtual Compton Scattering: the nucleon polarisabilities
• Spin-dependent sum rules connecting real and virtual Compton scattering verified
• Virtual Compton Scattering measurements in the nucleon resonance region
• Virtual Compton Scattering and Nucleon Generalized Polarizabilities
• Electromagnetic form factors of ${\Lambda }_b$ in the Bethe-Salpeter equation approach
• New Insight in the $Q^2$-Dependence of Proton Generalized Polarizabilities
• The chiral structure of the neutron as revealed in electron and photon scattering
• New approach to low energy Virtual Compton Scattering and generalized polarizabilities of the nucleon
• Measurement of the Generalized Polarizabilities of the Proton at Intermediate $Q^2$
• Nucleon Polarizabilities: Theory
• Momentum transfer dependence of the proton's electric and magnetic polarizabilities
• Virtual Compton scattering at low energies with a positron beam
• The Proton Electromagnetic Generalized Polarizabilities
• Electromagnetic form factors of ${\Lambda }_c$ in the Bethe-Salpeter equation approach
• Virtual Compton Scattering and Neutral Pion Electroproduction in the Resonance Region up to the Deep Inelastic Region at Backward Angles