ΔI = 1 axial-vector mixing and charge symmetry breaking

1996/06/27 by S. A. Coon, Bruce H. J. McKellar, B. H. J. McKellar +1
Physics and Astronomy · #Nuclear physics research studies #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-th

paper · pdf · doi:10.1016/0370-2693(96)00896-9

published as Phys.Lett. B385 (1996) 25-32 · 14 pages. To appear in Phys. Lett. B

arxiv created 1996/06/27 · openalex publication_date 1996/09/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

Phenomenological Lagrangians that exhibit (broken) chiral symmetry as well as isospin violation suggest short-range charge symmetry breaking (CSB) nucleon-nucleon potentials with a \boldmath σ₁ ⋅ \boldmath σ₂ structure. This structure could be realized by the mixing of axial-vector (1⁺) mesons in a single-meson exchange picture. The Coleman-Glashow scheme for ΔI_z=1 charge symmetry breaking applied to meson and baryon SU(2) mass splittings suggests a universal scale. This scale can be extended to ΔI=1 nonstrange CSB transitions ⟨ a₁^∘|H_em|f₁⟩ of size -0.005 GeV². The resulting nucleon-nucleon axial-vector meson exchange CSB potential then predicts ΔI=1 effects which are small.

Citations

• Constraints on the momentum dependence of rho-omega mixing
• Decay Correlations of Heavy Leptons ine++e−→l++l−
• Off-shell ρ-ω mixing in QCD sum rules
• Review of particle properties
• Phenomenological Lagrangians