Measurement of the electric polarizability of the neutron

Schmiedmayer, Jörg; Riehs, P.; Harvey, J.; Hill, N. W.

doi:10.1103/physrevlett.66.1015

Cited by 148 publications

(165 citation statements)

References 23 publications

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“…Experimentally, α n is found through Compton scattering off of a deuteron and the polarizability of a proton must be included in the model. In this data, there are four experimental results, [4,5,6,7]; but [7] incorporates [4]. L'vov [8] corrected the earlier values by adding 0.6 × 10 −4 fm 3 to their results.…”

Section: Results and Conclusionmentioning

confidence: 99%

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Electric polarizability of hadrons

Christensen

Lee

Wilcox

et al. 2003

Nuclear Physics B - Proceedings Supplements

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Section: Results and Conclusionmentioning

confidence: 99%

“…The results are quite model-dependent, and even the experiments do not agree. We note that [9] claims [5,8] miscalculated their errors. Further, [12] used [10]'s results to get a different number and then the authors of [10] joined others [13] to find a result close to their original value.…”

Section: Results and Conclusionmentioning

confidence: 99%

Electric polarizability of hadrons

Christensen

Lee

Wilcox

et al. 2003

Nuclear Physics B - Proceedings Supplements

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“…The electric polarizability α n E1 can in principle be measured by scattering low-energy neutrons on the Coulomb field of a heavy nucleus, whereas the magnetic polarizability β n M1 remains essentially unconstrained by such an experiment. This technique seemed to be very promising until the beginning of the 1990's, when Schmiedmayer et al (1991) obtained the value α n E1 = 12.6 ± 1.5 (stat) ± 2.0 (syst) by scattering neutrons with energies 50 eV≤ E n ≤ 50 keV off a 208 Pb target. Shortly later, however, Nikolenko and Popov (1992) argued that the errors were underestimated by a factor 5.…”

Section: Rcs Data and Extraction Of The Neutron Polarizabilitiesmentioning

confidence: 99%

Hadron structure at lowQ2

Drechsel

Walcher

2008

Rev. Mod. Phys.

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This review deals with the structure of hadrons, strongly interacting many-body systems consisting of quarks and gluons. These systems have a size of about 1 fm, which shows up in scattering experiments at low momentum transfers Q in the GeV region. At this scale the running coupling constant of Quantum Chromodynamics (QCD), the established theory of the strong interactions, becomes divergent. It is therefore highly intriguing to explore this theory in the realm of its strong interaction regime. However, the quarks and gluons can not be resolved at the GeV scale but have to be studied through their manifestations in the bound many-body systems, for instance pions, nucleons and their resonances. The review starts with a short overview of QCD at low momentum transfer and a summary of the theoretical apparatus describing the interaction of hadrons with electrons and photons. In the following sections we present the experimental results for the most significant observables studied with the electromagnetic probe: form factors, polarizabilities, excitation spectra, and sum rules. These experimental findings are compared and interpreted with various theoretical approaches to QCD, such as phenomenological models with quarks and pions, dispersion relations as a means to connect observables from different experiments, and, directly based on the QCD lagrangian, chiral perturbation theory and lattice gauge theory.

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“…Experimentally there is information about the dynamic polarizabilities obtained from Compton scattering [68] [69], which have to be corrected for relativistic and retardation effects caused by the finite size of the nucleon [70]- [73] and about the static electric polarizability of the neutron from neutron nucleus scattering [73] . There is no direct measurement of the static polarizabilities of the proton.…”

Section: Polarizabilitiesmentioning

confidence: 99%

Quantum corrections to baryon properties in chiral soliton models

Meier¹,

Walliser²

1997

Physics Reports

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Chiral lagrangians as effective field theories of QCD are successfully applied to meson physics at low energies in the framework of chiral perturbation theory. Because of their nonlinear structure these lagrangians allow for static soliton solutions which may be interpreted as baryons. Their semiclassical quantization, which provides the leading order in an 1/N C expansion (N C is the number of colors) turned out to be insufficient in many cases to obtain good agreement with empirical baryon observables. However with N C = 3, large corrections are expected in the next-to-leading order which is carried by pionic fluctuations around the soliton background. The calculation of these corrections requires renormalization to 1-loop of the underlying field theory. We present a procedure to calculate the 1-loop contributions for a variety of baryonic observables. In contrast to chiral perturbation theory, terms with an arbitrary number of gradients may in principle contribute and the restriction to low chiral orders can only be justified by the investigation of the scale independence of the results. The results generally give the right sign and magnitude to reduce the discrepancy between theory and experiment with one exception: the axial quantities. These suffer from the fact that the underlying current algebra mixes different N C orders, which suggests a large and positive next-to-next-to-leading order contribution, which is probably sufficient to close the gap to experiment.

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Measurement of the electric polarizability of the neutron

Cited by 148 publications

References 23 publications

Electric polarizability of hadrons

Electric polarizability of hadrons

Hadron structure at lowQ2

Quantum corrections to baryon properties in chiral soliton models

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