dorsal/arxiv
View SchemaExplicit Delta(1232) Degrees of Freedom in Compton Scattering off the Deuteron
| Authors | Robert P. Hildebrandt, Harald W. Grießhammer, Thomas R. Hemmert, Daniel R. Phillips |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0405077 |
| URL | https://arxiv.org/abs/nucl-th/0405077 |
| DOI | 10.1016/j.nuclphysa.2004.11.017 |
| Journal | Nucl.Phys. A748 (2005) 573-595 |
Abstract
We examine elastic Compton scattering off the deuteron for photon energies between 50 MeV and 100 MeV in the framework of chiral effective field theories to next-to-leading order. We compare one theoretical scheme with only pions and nucleons as explicit degrees of freedom to another in which the Delta(1232) resonance is treated as an explicit degree of freedom. Whereas pion degrees of freedom suffice to describe the experimental data measured at about 70 MeV, the explicit Delta(1232) gives important contributions that help to reproduce the angular dependence at higher energies. The static isoscalar dipole polarizabilities alpha_E^s and beta_M^s are fitted to the available data, giving results for the neutron polarizabilities alpha_E^n=(14.2+-2.0(stat)+-1.9(syst))*10^(-4)fm^3, beta_M^n=(1.8+-2.2(stat)+-0.3(syst))*10^(-4)fm^3. These values are in good agreement with previous experimental analyses. Comparing them to the well-known proton values we conclude that there is currently no evidence for significant differences between the proton and neutron electromagnetic dipole polarizabilities.
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"abstract": "We examine elastic Compton scattering off the deuteron for photon energies\nbetween 50 MeV and 100 MeV in the framework of chiral effective field theories\nto next-to-leading order. We compare one theoretical scheme with only pions and\nnucleons as explicit degrees of freedom to another in which the Delta(1232)\nresonance is treated as an explicit degree of freedom. Whereas pion degrees of\nfreedom suffice to describe the experimental data measured at about 70 MeV, the\nexplicit Delta(1232) gives important contributions that help to reproduce the\nangular dependence at higher energies. The static isoscalar dipole\npolarizabilities alpha_E^s and beta_M^s are fitted to the available data,\ngiving results for the neutron polarizabilities\nalpha_E^n=(14.2+-2.0(stat)+-1.9(syst))*10^(-4)fm^3,\nbeta_M^n=(1.8+-2.2(stat)+-0.3(syst))*10^(-4)fm^3. These values are in good\nagreement with previous experimental analyses. Comparing them to the well-known\nproton values we conclude that there is currently no evidence for significant\ndifferences between the proton and neutron electromagnetic dipole\npolarizabilities.",
"arxiv_id": "nucl-th/0405077",
"authors": [
"Robert P. Hildebrandt",
"Harald W. Grie\u00dfhammer",
"Thomas R. Hemmert",
"Daniel R. Phillips"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/j.nuclphysa.2004.11.017",
"journal_ref": "Nucl.Phys. A748 (2005) 573-595",
"title": "Explicit Delta(1232) Degrees of Freedom in Compton Scattering off the Deuteron",
"url": "https://arxiv.org/abs/nucl-th/0405077"
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