# Photon 2015

15-19 June 2015
Asia/Novosibirsk timezone
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# Results and prospects on hadronic cross section and γγ physics at KLOE/KLOE-2

## Speakers

• Dr. Giuseppe MANDAGLIO

## Content

The KLOE experiment was the first to exploit Initial State Radiation (ISR) processes to obtain the $e^+e^-rightarrowpi^+pi^-(gamma)$ 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 $pipigamma / mumugamma$ 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 $gammagamma$ 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 $pi^0rightarrowgammagamma$ decay and $gamma^*gammarightarrowpi^0$ transition form factor. These measurements provide constraints to the models used to calculate the hadronic light-by-light contribution to the muon anomaly.