Jean Pestieau

On the mass, width and coupling constants of the f(0)(980)

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

tau -decay and second-class currents

\pi\pi

Delta++ contribution to the elastic and radiative pi+ p scattering

data for the phase shift and inelasticity, and the invariant mass spectrum of the

Final state interaction phases in (B ---> K pi) decay amplitudes

J/\psi\rightarrow\phi\pi\pi, \phi K\bar K

Lepton Self-mass, Higgs Scalar and Heavy-quark Masses

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 f0(980), the precise position depending upon the

Behaviour of the absorptive part of the W± electromagnetic vertex

\pi\pi

Pion - proton scattering and isospin breaking in the Delta0 - Delta++ system

data used. As a byproduct, values for the

W+- and Z0 propagators on the resonance region

g_{f_0\pi\pi}

LOW-ENERGY THEOREM AND PHOTODISINTEGRATION OF LIGHT NUCLEI

and

Hadronic phases and isospin amplitudes in D(B) ---> pi pi and D(B) ---> K anti-K decays

g_{f_0K\bar K}