Sa-wave γγ→ππ and f0 (980)→ππ

We report on a dispersion relation for the γγ→(ππ)I Sa-wave in isospin I emphasizing the low energy region. The f0(980) signal that emerges in γγ→ππ is also discussed. Our results could be used to distinguish between different ππ isoscalar Sa-wave parameterizations. We also calculate the width of th...

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Detalles Bibliográficos
Autores principales: Oller, J.A., Roca, L., Schat, C., Luso-American Foundation for Development (FLAD); Calouste Gulbenkian Foundation (FCG); Foundation for Science and Technology (FCT); Center of Physics of the Fundamental Interactions (CFIF); Center of Theoretical Particle Physics (CFTP)
Formato: JOUR
Materias:
meson-meson scattering
scalar resonances
two photons
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0094243X_v1030_n_p147_Oller
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:We report on a dispersion relation for the γγ→(ππ)I Sa-wave in isospin I emphasizing the low energy region. The f0(980) signal that emerges in γγ→ππ is also discussed. Our results could be used to distinguish between different ππ isoscalar Sa-wave parameterizations. We also calculate the width of the σ resonance to γγ and obtain the value Γ(σ→γγ) = (1.68±0.15)KeV. Finally, we elaborate on the size of the f0(980) coupling to ππ and show that its smallness compared to the KKÌ" one is not related to the OZI rule. © 2008 American Institute of Physics.

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