Speaker: Claudio GATTI
Title
d0-d2 phase shift difference and scalar mesons @ KLOE
Abstract
The first item of the talk will be the KLOE measurement of the ratio KS->pi+pi-(gamma)/pi0pi0, which allows the estimate of the pi+pi- phase shift difference for I=0 and I=2, which was affected by a large experimental uncertainty due to the presence of e.m. interaction. The second item discussed will be the study of phi radiative decays into scalar mesons f0(980) and a0(980). These are not easily interpreted as qq states. Other possibilities being qqqq states, and KK molecules. The ratio phi->f0 gamma/a0 gamma is measured in order to determine their real nature.

Slides