A Status Report of KLOE at DAFNE

TL;DR

The KLOE experiment at DAFNE aims to precisely measure CP violation parameters in the kaon system, with initial data showing successful hardware and software performance despite luminosity challenges.

Contribution

This report provides the first operational status and performance assessment of the KLOE experiment at DAFNE, including initial data collection and technical challenges.

Findings

Achieved initial data collection of 220 nb^{-1} luminosity.

KLOE hardware and software meet design specifications.

Luminosity was temporarily reduced due to solenoid perturbations.

Abstract

The major goal of the KLOE experiment is to measure Re(epsilon' /epsilon) in the kkbar system, with a precision of 10^{-4},both via the traditional double ratio method and quantum interferometry. The experiment has started taking data at DAFNE, the phi-factory built at the Frascati National Laboratory (LNF) of INFN in Italy, beginning in April 1999. In the early phase of the commissioning (before KLOE roll-in), DAFNE has achieved multi bunch luminosities of 10^{31} cm^{-2} s^{-1} with 13 bunches and 200 mA. Detailed studies are presently underway to compensate for the large perturbation brought in by the KLOE solenoid, which has caused a drastic decrease of the peak luminosity. Nevertheless the first collected data, corresponding to an integral luminosity of 220 nb^{-1}, show that KLOE is performing to the design specifications in all its hardware and software components.