Abstract
A variety of strong and electroweak interaction properties of a pion and a light scalar meson are computed in a relativistic quark model. Under the assumption that the resulting coupling of these mesons to the constituent quarks is identical, the meson mass is determined as We discuss in detail the gauging of the nonlocal meson-quark interaction and calculate the electromagnetic form factor of the pion and the form factors of the and processes. We obtain explicit expressions for the relevant form factors and evaluate the leading and next-to-leading orders for large Euclidean photon virtualities. Turning to the decay properties of we determine the width of the electromagnetic transition and discuss the strong decay In a final step we compute the nonleptonic decays and relevant for the possible observation of the meson. All our results are compared to available experimental data and to results of other theoretical studies.
- Received 4 April 2003
DOI:https://doi.org/10.1103/PhysRevD.68.014011
©2003 American Physical Society