First results from phi -> KL KS decays with the KLOE detector

TL;DR

This paper presents initial measurements from the KLOE detector at the phi-factory, including K meson parameters, decay properties, and regeneration probabilities, based on early data collection in 1999.

Contribution

First experimental results from the KLOE detector on K meson decays, masses, lifetimes, and regeneration probabilities during initial phi-factory commissioning.

Findings

Measured Kshort and Klong decay parameters.

Determined regeneration probabilities in different materials.

Validated detector performance with phi -> KL KS decays.

Abstract

The KLOE experiment has collected 2.4 1/pb of integrated luminosity during the commissioning of the DAFNE phi-factory in 1999. The performance of the detector has been studied using phi -> KL KS decays collected during this period, yielding also first measurements of relevant K parameters such as masses and lifetimes. A clean Kshort -> pi+ pi- sample is used to select Klong -> 2pi CP-violating decays and Klong -> Kshort regeneration events in the detector material. Results on the regeneration probability in beryllium-alluminum alloy and carbon-fiber plus aluminum composite are presented.