Abstract
Based on a quark-model approach previously developed by us which employs a continuation in terms of generalized meson-dominance form factors we study the weak production of the isobar . First we demonstrate that our model is in agreement with the Argonne data on charged-current production of the . We then study neutral-current production using four different gauge models, namely, the standard Weinberg-Salam model, a vectorlike model with six quarks, a five-quark model due to Achiman, Koller, and Walsh, and a variant of the Gürsey-Sikivie model. We fine that the results for the differential cross section in the forward region ( Ge) are very sensitive to the structure of the weak neutral current and suggest that measurements in this region constitute a stringent test of weak-interaction models. We also calculate the density-matrix elements measurable from decay correllations. The density-matrix elements are not so sensitive to the models containing some axial-vector contribution, whereas the vectorlike model shows a behavior quite distinct from the others.
- Received 8 August 1977
DOI:https://doi.org/10.1103/PhysRevD.18.3178
©1978 American Physical Society