24-28 February 2020
Budker Institute of Nuclear Physics
Asia/Novosibirsk timezone

The KLOE-2 e+e- tagging for two-photon physics

24 Feb 2020, 15:30
Contributed Oral Colliders and detector integration Colliders and detector integration


Dr Francesca Curciarello (INFN-Laboratori Nazionali di Frascati)


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)

Presentation Materials