Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-04-03
Phys.Rev. D68 (2003) 014011
Physics
High Energy Physics
High Energy Physics - Phenomenology
46 pages
Scientific paper
10.1103/PhysRevD.68.014011
A variety of strong and electroweak interaction properties of the pion and the light scalar sigma 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 sigma meson mass is determined as M_sigma=385.4 MeV. We discuss in detail the gauging of the non-local meson-quark interaction and calculate the electromagnetic form factor of the pion and the form factors of the pi(0) -> gamma gamma and sigma -> gamma gamma 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 the sigma we determine the width of the electromagnetic sigma -> gamma gamma transition and discuss the strong decay sigma -> pi pi. In a final step we compute the nonleptonic decays D -> sigma pi and B -> sigma pi relevant for the possible observation of the sigma meson. All our results are compared to available experimental data and to results of other theoretical studies.
Faessler Amand
Gutsche Th.
Ivanov Michael A.
Lyubovitskij Valery E.
Wang Pei
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