{rho}-{omega} mixing self-energy and model quark-gluon dynamics

Technical Report · Tue Aug 01 04:00:00 EDT 1995

DOI:https://doi.org/10.2172/166440· OSTI ID:166440

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

The u-d quark-loop vacuum polarization process that mixes the {omega} and {rho} mesons and its contribution to the Charge-Symmetry-Breaking (CSB) piece of the nucleon-nucleon (NN) interaction has been studied in a QCD-based, model field theory: the Global Color-symmetry Model (GCM), using a confining quark propagator obtained in earlier studies. In fitting NN phase shifts it was found necessary to include a term in the NN potential that has, conventionally, been attributed to the mixing between {omega} and {rho} mesons that arises because of isospin asymmetry at the quark level, as manifest in the small u-d current-quark-mass difference. To the present, this term was modeled and assumed to be momentum independent. It is important to understand this term in the context of QCD. The results of this study indicate that the modification of the meson propagators produced by the quark loop is alone not sufficient to account for the observed charge symmetry breaking effects in the NN interaction. We are exploring other possible mechanisms which may describe the origin of CSB in the NN interaction.

• Research Organization: Argonne National Lab., IL (United States)
• OSTI ID: 166440
• Report Number(s): ANL--95/14; ON: DE96000985
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
C INVARIANCE
D QUARKS
NUCLEON-NUCLEON INTERACTIONS
OMEGA BARYONS
PROGRESS REPORT
QUARK MODEL
QUARK-QUARK INTERACTIONS
SELF-ENERGY
SYMMETRY BREAKING
VECTOR MESONS