DOI: 10.1140/epjc/s2003-01140-6
On the mass, width and coupling constants of the f0(980)
R. Escribano1, A. Gallegos2, J.L. Lucio M.2, G. Moreno2 and J. Pestieau31 Grup de Física Teòrica and IFAE, Universitat Autònoma de Barcelona, 08193 Bellaterra (Barcelona), Spain
2 Instituto de Física, Universidad de Guanajuato, Lomas del Bosque #103, Lomas del Campestre, 37150 León, Guanajuato, Mexico
3 Institut de Physique Théorique, Université Catholique de Louvain, Chemin du Cyclotron 2, 1348 Louvain-la-Neuve, Belgium
(Received: 6 June 2002 / Revised version: 21 October 2002 / Published online: 3 March 2003)
Abstract
Using the pole approach we determine the mass and width of the
f0(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
version of the
Breit-Wigner parameterization.
We find that a single pole describes the
f0(980), the precise
position
depending upon the
data used.
As a byproduct, values for the
and
coupling constants are obtained.
© Società Italiana di Fisica, Springer-Verlag 2003