[Submitted on 8 Jan 2015]
Electromagnetic and neutral-weak response functions of 4He and 12C
A. Lovato🇺🇸 · S. Gandolfi🇺🇸 · J. Carlson🇺🇸 · Steven C. Pieper🇺🇸 · R. Schiavilla🇺🇸
Ab initio calculations of the quasi-elastic electromagnetic and neutral-weak response functions of 4He and 12C are carried out for the first time. They are based on a realistic approach to nuclear dynamics, in which the strong interactions are described by two- and three-nucleon potentials and the electroweak interactions with external fields include one- and two-body terms. The Green's function Monte Carlo method is used to calculate directly the Laplace transforms of the response functions, and maximum-entropy techniques are employed to invert the resulting imaginary-time correlation functions with associated statistical errors. The theoretical results, confirmed by experiment in the electromagnetic case, show that two-body currents generate excess transverse strength from threshold to the quasi-elastic to the dip region and beyond. These findings challenge the conventional picture of quasi-elastic inclusive scattering as being largely dominated by single-nucleon knockout processes.
- Comments:
- 6 pages, 3 figures
- Subjects:
- Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph)
- arXiv:
- 1501.01981 [pdf]