https://doi.org/10.1051/epjconf/202227000028
Trigger rejection factor in the first kaonic helium run with the complete SIDDHARTA-2 setup
1 INFN, Laboratori Nazionali di Frascati, Via E. Fermi 54, I-00044 Frascati(RM), Italy
2 Stefan Meyer Institute for Subatomic Physics, Kegelgasse 27, 1030 Wien, Austria
3 Department of Physics, Faculty of Science, University of Zagreb, Zagreb, Croatia
4 Horia Hulubei National Institute of Physics and Nuclear Engineering, Str. Atomistilor No. 407, PO Box MG-6 Bucharest-Măgurele, Romania
5 Politecnico di Milano, Dipartimento di Elettronica, Informazione e Bioingegneria and INFN Sezione di Milano, I-20133 Milano, Italy
6 Excellence Cluster Universe, Technische Universiät München, Boltzmannstraße 2, 85748 Garching bei München, Germany
7 RIKEN, Institute of Physical and Chemical Research, Wako, Japan
8 Faculty of Physics, Astronomy, and Applied Computer Science, Jagiellonian University, Łojasiewicza 11, 30-348 Kraków, Poland
9 Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai, Japan
10 Centro Ricerche Enrico Fermi—Museo Storico della Fisica e Centro Studi e Ricerche ‘Enrico Fermi’, Via Panisperna 89A, 00184, Roma, Italy
11 University of Vienna, Vienna Doctoral School in Physics, Vienna, Austria
* e-mail: Luca.DePaolis@lnf.infn.it
Published online: 17 November 2022
The SIDDHARTA-2 experiment aims to perform the first measurement of the kaonic deuterium 2p → 1s x-ray transition energy. Such measurement, together with the measurement of kaonic hydrogen 2p → 1s x-ray energy transition performed by the SIDDHARTA experiment in 2011, allows the determination of kaon proton and kaon neutron scattering lengths and represents a fundamental input for the low energies QCD in the strangeness sector theory. The SIDDHARTA-2 experiment is presently installed at the DAΦNE electronpositron collider at the National Laboratories of Frascati, in Italy. In May 2022, the kaonic 4He x-ray transitions measurement was performed by the complete SIDDHARTA-2 setup, by using a gaseous target. The result of this measurement is presented in this paper, with a specific focus on the background rejection performed by the kaon trigger system.
© The Authors, published by EDP Sciences, 2022
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).
