Thumbnail
Access Restriction
Open

Author Balla, J. ♦ Blotz, A. ♦ Goeke, K.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ BAG MODEL ♦ NEUTRONS ♦ ELECTRIC MOMENTS ♦ CHIRAL SYMMETRY ♦ SOLITONS ♦ QUARK MODEL ♦ SYMMETRY BREAKING
Abstract Within the chiral quark soliton or Nambu{endash}Jona-Lasinio model with a Witten-Veneziano type of U{sub A}(1) symmetry breaking as well as with a finite {theta} vacuum angle, we calculate the leading term (N{sub c}{sup 0}m{sub {pi}}{sup 2}) in a systematic 1/N{sub c} expansion of the electric dipole moment of the neutron. The consistency requirement that the effects of {theta} should vanish, if either the anomaly or any quark mass vanishes, is satisfied. The resulting upper limit for {theta} is {theta}{lt}2.8{times}10{sup {minus}9}, which lies close to the upper bound obtained in the literature from other chiral models. {copyright} {ital 1999} {ital The American Physical Society}
ISSN 05562821
Educational Use Research
Learning Resource Type Article
Publisher Date 1999-03-01
Publisher Place United States
Journal Physical Review, D
Volume Number 59
Issue Number 5


Open content in new tab

   Open content in new tab