On the mass,width and coupling constants of the f0(980) |
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| Authors: | R. Escribano A. Gallegos J.L. Lucio M. G. Moreno J. Pestieau |
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| Affiliation: | (1) Grup de Física Teòrica and IFAE, Universitat Autònoma de Barcelona, 08193 Bellaterra (Barcelona), Spain , ES;(2) Instituto de Física, Universidad de Guanajuato, Lomas del Bosque #103, Lomas del Campestre, 37150 León, Guanajuato, Mexico , MX;(3) Institut de Physique Théorique, Université Catholique de Louvain, Chemin du Cyclotron 2, 1348 Louvain-la-Neuve, Belgium , BE |
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| Abstract: | Using the pole approach we determine the mass and width of the f 0 (980); in particular, we analyze the possibility that two nearby poles are associated to it. We restrict our analysis to a neighborhood of the resonance, using data for the phase shift and inelasticity, and the invariant mass spectrum of the decays. The formalism we use is based on unitarity and a generalized ver sion of the Breit-Wigner parameterization. We find that a single pole describes the f 0 (980), the precise position depending upon the data used. As a byproduct, values for the and coupling constants are obtained. Received: 6 June 2002 / Revised version: 21 October 2002 / Published online: 3 March 2003 |
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