2 research outputs found
Elastic electron-deuteron scattering in chiral effective field theory
We calculate elastic electron-deuteron scattering in a chiral effective field
theory approach for few-nucleon systems based on a modified Weinberg power
counting. We construct the current operators and the deuteron wave function at
next-to-leading (NLO) and next-to-next-to-leading (NNLO) order simultaneously
within a projection formalism. The leading order comprises the impulse
approximation of photons coupling to point-like nucleons with an anomalous
magnetic moment. At NLO, we include renormalizations of the single nucleon
operators. To this order, no unknown parameters enter. At NNLO, one
four-nucleon-photon operator appears. Its strength can be determined from the
deuteron magnetic moment. We obtain not only a satisfactory description of the
deuteron structure functions and form factors measured in electron-deuteron
scattering but also find a good convergence for these observables.Comment: 13 pp, elsart.cls, 4 figs, extended version, includes NNLO
corrections and more detailed discussion
A Perturbative Calculation of the Electromagnetic Form Factors of the Deuteron
Making use of the effective field theory expansion recently developed by the
authors, we compute the electromagnetic form factors of the deuteron
analytically to next-to-leading order (NLO). The computation is rather simple,
and involves calculating several Feynman diagrams, using dimensional
regularization. The results agree well with data and indicate that the
expansion is converging. They do not suffer from any ambiguities arising from
off-shell versus on-shell amplitudes.Comment: 22 pages, 8 figures. Discussion of effective range theory added,
typos correcte