The glueball among the light scalar mesons

Details The glueball among the light scalar mesons The glueball among the light scalar mesons

2007-11-26

arxiv.org/abs/0711.3902v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

Contribution to HADRON07 (XII Int. Conf. on Hadron Spectroscopy - Frascati, Oct 8-13, 2007), reference added

Scientific paper

The lightest gluonic meson is expected with J^{PC}=0^{++}, calculations in full QCD point towards a mass of around 1 GeV. The interpretation of the scalar meson spectrum is hindered as some states are rather broad. In a largely model-independent analysis of pi+ pi- \to pi+ pi-, pi0 pi0 scattering in the region 600-1800 MeV a unique solution for the isoscalar S-wave is obtained. The resonances f_0(980), f_0(1500) and the broad f_0(600) or ``sigma'' are clearly identified whereas f_0(1370) is not seen at the level B(f_0(1370)\to pi pi)\gtrsim 10%. Arguments for the broad state to be a glueball are recalled. We see no contradiction with the reported large B(sigma \to gamma gamma) and propose some further experimental tests.

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