Electric dipole moment of the neutron in the chiral quark soliton model

Journal Article · Mon Mar 01 04:00:00 EST 1999 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.59.056005· OSTI ID:306281

Balla, J ^[1]; Blotz, A ^[2]; Goeke, K ^[1]

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1. Institute for Theoretical Physics II, Ruhr-University Bochum, D-44780 Bochum (Germany)
2. Theoretical Division, MS B283, LANL, Los Alamos, New Mexico 87545 (United States)

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}

• OSTI ID: 306281
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 5 Vol. 59; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BAG MODEL
CHIRAL SYMMETRY
ELECTRIC MOMENTS
NEUTRONS
QUARK MODEL
SOLITONS
SYMMETRY BREAKING