  According to the QCD expectations the lightest glueball should be a scalar
particle (J^{PC}=0^{++}). Different scenarios have been considered for a
classification of these states but -- despite considerable progress in recent
years -- the experimental basis for various parameters is still rather weak. We
present a new analysis of the elastic and charge exchange pi pi scattering
between 1000 and 1800 MeV. A unique solution is selected which shows clear
evidence for f_0(1500) and a broad state (\sigma or ``f_0(1000)''), but there
is no evidence for f_0(1370) at a level of \gtrsim 10% branching ratio to pi
pi. Arguments in favour of the broad state to be a glueball are summarized.
