PoS - Proceedings of Science
Volume 390 - 40th International Conference on High Energy physics (ICHEP2020) - Parallel: Strong Interactions and Hadron Physics
Results and perspectives on hadron physics at KLOE/KLOE-2
V. De Leo* on behalf of the KLOE-2 Collaboration
*corresponding author
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Pre-published on: January 11, 2021
Published on:
Abstract
The KLOE-2 data-taking at the $e^+e^-$ DA$\Phi$NE collider in Frascati has been completed by achieving an integrated luminosity of more than 5 fb$^{-1}$ at the $\phi$ peak. KLOE-2 is an updated version of the KLOE experiment with new detectors and an extended physics program, including light mesons investigations at unprecedented statistics. The KLOE/KLOE-2 data sample corresponds to more than $3\times10^8$ eta-meson events. The huge available statistics has been used to search for the P, CP violating $\eta \rightarrow \pi^+\pi^-$, obtaining the most stringent upper limit for this decay by using 1.7 fb$^{-1}$ of KLOE data. The status of the $\eta \rightarrow \pi^0 \gamma \gamma$ decay will be reported and also the progress on the investigation on the B boson, a postulated leptophobic mediator of dark forces, which uses the same five photon final state. Among the aims of the KLOE-2 experiment there is the study of the reaction $e^+e^- \rightarrow e^+e^-\gamma\gamma \rightarrow e^+e^-X$ by tagging the final state of the leptons. Data stability studies, based on very low angle Bhabha cross section measurement, and updates on $\gamma\gamma \rightarrow \pi^0$ analysis will be presented.
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