ICHEP 2020

Flavor Physics and Discrete Symmetries at KLOE-2

30 Jul 2020, 12:29

15m

virtual conference

Talk 05. Quark and Lepton Flavour Physics Quark and Lepton Flavour Physics

Speakers

Michal Silarski (Jagiellonian University) Michal Silarski

Description

Present data sample of 8 fb${}^{-1}$ collected by KLOE and KLOE-2 experiments at the upgraded DA$\mathrm{\Phi }$NE collider of the INFN Laboratori Nazionali di Frascati corresponds to the largest sample ever collected at the $\varphi$(1020) meson peak at an $e^{+}{e}^{-}$ collider - $2.4\times {10}^{10}$ $\varphi$-mesons produced.

The lepton charge asymmetry measured in $K_S$ semileptonic decays with 1.7 fb${}^{-1}$ of KLOE data, improving the statistical uncertainty of the present result by about a factor two, will be presented together with the test of CPT in transitions in $\varphi \to K_S{K}_L\to \pi e\nu ,3{\pi }^0$ and $\pi e\nu ,2\pi$ decays. Latest results on $K_S$ rare decays will be discussed in the framework of Flavour Physics and CP Violation tests. Among these the first measurement ever on the $K_S\to \pi \mu \nu$ branching ratio at a 4.4% total accuracy, using 1.7 fb${}^{-1}$ KLOE data allowing a new determination of the $V_{us}$ CKM matrix element and the test of lepton-flavour universality using $K_S$ mesons, and the search for the pure CP-violating $K_S\to 3{\pi }^0$ decay with the newly acquired KLOE-2 data set.

Presentation materials

Silarski_ICHEP2020.pdf