Quark model analysis of the charge symmetry breaking in nuclear force
Abstract
In order to investigate the charge symmetry breaking (CSB) in the shortrange part of the nuclear force, we calculate the difference of the masses of the neutron and the proton, ΔM, the difference of the scattering lengths of the pp and nn scatterings, Δa, and the difference of the analyzing power of the proton and the neutron in the np scattering, ΔA(θ), by a quark model. In the present model the sources of CSB are the mass difference of the up and down quarks and the electromagnetic interaction. We investigate how much each of them contributes to ΔM, Δa, and ΔA(θ). It is found that the contribution of CSB of the shortrange part in the nuclear force is large enough to explain the observed ΔA(θ), while Δa is rather underestimated.
 Publication:

Physical Review C
 Pub Date:
 August 2003
 DOI:
 10.1103/PhysRevC.68.024006
 arXiv:
 arXiv:nuclth/0307002
 Bibcode:
 2003PhRvC..68b4006N
 Keywords:

 13.75.Cs;
 12.39.Jh;
 13.88.+e;
 13.40.Ks;
 Nucleonnucleon interactions;
 Nonrelativistic quark model;
 Polarization in interactions and scattering;
 Electromagnetic corrections to strong and weakinteraction processes;
 Nuclear Theory
 EPrint:
 26 pages,6 figures