Search

The kaon nucleus (KN) interaction in dense nuclear matter is predicted to be repulsive and increasing with density. However, determined values for this potential are not yet consistent with each other (Benabderrahmane et al., Phys Rev Lett 102:182501, ; Agakishiev et al., Phys Rev C 82:044907, ; Büscher et al., Eur Phys J A 22:301-317, ). We analyze $K^0_S$ mesons identified with the HADES detector in p+p and p+ Nb reactions at 3.5 GeV kinetic beam energy. To determine the KN potential at normal nuclear density we propose to compare the $K^0_S$ differential distributions in p+ Nb and p+p collisions. High statistics of low p-kaons ( p < 100 MeV/c) ensure the sensitivity of our measurements to the nuclear matter effects. We present the data analysis method and first results. [ABSTRACT FROM AUTHOR]

The KLOE-2 experiment continues and extends the program of its predecessor KLOE in the field of discrete symmetry tests with the K meson system, among other studies which comprise light meson spectroscopy, dark matter searches and γγ physics. Together, KLOE and KLOE-2 have recorded the largest sample (almost 8 fb− 1) of e+e− collisions at the energy equal to ϕ meson mass, amounting to 2.4 × 1010 of produced ϕ mesons. We report on the latest results and ongoing analyses of KLOE and KLOE-2 concerning discrete symmetry tests and measurements of symmetry-violating observables. A measurement of the CPT violation sensitive asymmetry in semileptonic decays of K˙S with 1.7 fb− 1 of KLOE data will be presented, which improves the sensitivity w.r.t. previous measurements about twice. Moreover, status of direct tests of T and CPT in transitions of neutral kaons performed with the ϕ →K˙SK˙L → πeν, 3π0(2π) processes will be reported, followed by the search of the CP-violating decay K˙S → 3π0 using the data recently acquired by KLOE-2. [ABSTRACT FROM AUTHOR]