Charge symmetry breaking via rho - omega mixing from model quark - gluon dynamics

Mitchell, K.L.; Tandy, P.C.; Roberts, Craig D.; Cahill, R.T.

doi:10.1016/0370-2693(94)90351-4

Charge symmetry breaking via rho - omega mixing from model quark - gluon dynamics

Mar, 1994

14 pages

Published in:

Phys.Lett.B 335 (1994) 282-288

e-Print:

hep-ph/9403223 [hep-ph]

DOI:

10.1016/0370-2693(94)90351-4

Report number:

ANL-PHY-7718-TH-94,
KSUCNR-004-94

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Abstract:

The quark-loop contribution to the

\rho~0-\omega

mixing self-energy function is calculated using a phenomenologically successful QCD-based model field theory in which the

\rho~0

and

\omega

mesons are composite

\bar{q}q

bound states. In this calculation the dressed quark propagator, obtained from a model Dyson-Schwinger equation, is confining. In contrast to previous studies, the meson-

\bar{q}q

vertex functions are characterised by a strength and range determined by the dynamics of the model; and the calculated off-mass-shell behaviour of the mixing amplitude includes the contribution from the calculated diagonal meson self-energies. The mixing amplitude is shown to be very sensitive to the small isovector component of dynamical chiral symmetry breaking. The spacelike quark-loop mixing-amplitude generates an insignificant charge symmetry breaking nuclear force.

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