First tests of the full SIDDHARTA-2 experimental apparatus with a 4 He gaseous target

TL;DR

This paper reports the initial successful tests of the full SIDDHARTA-2 experimental setup with a helium gas target, demonstrating effective background rejection crucial for future kaonic deuterium measurements at the DAΦNE collider.

Contribution

First comprehensive testing of the complete SIDDHARTA-2 apparatus with a helium target, validating background rejection capabilities for upcoming kaonic deuterium experiments.

Findings

Achieved background rejection factor of 10^5.

Confirmed performance consistency with previous setup tests.

Paved the way for deuterium target measurements.

Abstract

In this paper, we present the first tests performed after the full installation of the SIDDHARTA-2 experimental apparatus on the Interaction Region of the DA{\Phi}NE collider at the INFN National Laboratories of Frascati. Before starting the first measurement of the kaonic deuterium 2p{\rightarrow}1s transition, accurate evaluation of the background rejection. mainly achieved with the Kaon Trigger system, was required. This run, performed in the period 04-26/05/2022 with a 4 He gaseous target, confirmed the 10^5 rejection factor obtained with a reduced version of the setup and different machine conditions in 2021. This important outcome motivated the filling of the target cell with deuterium and the starting of the measurement campaign of the kaonic deuterium 2p{\rightarrow}1s transition.