Speaker
Dr
Francesca Curciarello
(INFN-Laboratori Nazionali di Frascati)
Description
One goal of the KLOE-2 experiment, at the Frascati $\phi-$factory, is to study $e^+e^- \to \gamma^{\ast}\gamma^{\ast}e^+e^-\to
\pi^0 e^+e^-$ processes by tagging final state leptons with two scintillator hodoscopes installed, by means of roman pots, in the
DA$\Phi$NE beam pipe.
The High energy tagger (HET) counting rate is dominated by Bhabha scattering events without any associated signal in the KLOE
detector. By comparison with the KLOE luminosity measurement, the effective Bhabha cross section per scintillator can be measured,
in order to monitor detector performance and infer acceptance$\times$efficiency of the HET.
The $\pi^0$ production from two-photon fusion is tagged by requiring the coincidence between the HET detector and the KLOE
calorimeter when two-cluster bunches are reconstructed, and evaluating the uncorrelated HET-KLOE time coincidences.
Data stability studies, based on very low angle Bhabha cross section measurement, and updates on $\gamma^{\ast}\gamma^{\ast}\to
\pi^0$ search will be presented.
Primary author
Dr
Francesca Curciarello
(INFN-Laboratori Nazionali di Frascati)
