Deuteron Compton scattering in effective field theory: Spin-dependent cross sections and asymmetries
Journal
Physical Review
Journal Volume
C71
Pages
044321
Date Issued
2004-08
Author(s)
Abstract
Polarized Compton scattering on the deuteron is studied in nuclear effective field theory. A set of tensor structures is introduced to define 12 independent Compton amplitudes. The scalar and vector amplitudes are calculated up to next-to-next-to-leading order in low-energy power counting. Significant contribution to the vector amplitudes is found to come from the spin-orbit type of relativistic corrections. A double-helicity-dependent cross section Δ1dσ/dΩ = (dσ+1-1 - dσ+1+1)/2dΩ is calculated to the same order, and the effect of the nucleon isoscalar spin-dependent polarizabilities is found to be smaller than the effect of isoscalar spin-independent ones. Contributions of spin-independent polarizabilities are investigated in various asymmetries, one of which has an effect as large as 12% (26%) at the center-of-mass photon energy 30 (50)MeV. ©2005 The American Physical Society.
SDGs
Type
journal article