Speaker
Dr
Giuseppe Mandaglio
(Dipartimento di Fisica e di Scienze della Terra)
Description
The KLOE experiment was the first to exploit Initial State Radiation
(ISR) processes to obtain the $e^+e^-\rightarrow\pi^+\pi^-(\gamma)$ cross section below 1 GeV.
Three measurements have been published with small angle photon in the initial state: normalized using luminosity from Bhabha in 2005 and 2008 and using $\pi\pi\gamma / \mu\mu\gamma$ ratio in 2014. An independent measurement with the large angle photon normalized to Bhabha has been published in 2011.
These measurements are in good agreement, showing a good consistency among different analyses.
The Gounaris-Sakurai fit of the pion form factor of the combined KLOE measurements will be also discussed.
We also present the $\gamma\gamma$ physics project of KLOE-2 experiment, made possible after the recent KLOE upgrade with new small angle tagging detectors along the DAFNE beam line. The new detectors combined with KLOE apparatus allow to measure the $\pi^0\rightarrow\gamma\gamma$ decay and $\gamma^*\gamma\rightarrow\pi^0$ transition form factor. These measurements provide constraints to the models used to calculate the hadronic light-by-light contribution to the muon anomaly.
Primary author
Dr
Giuseppe Mandaglio
(Dipartimento di Fisica e di Scienze della Terra)
