ACTA

First Tests of the Full SIDDHARTA-2 Experimental Apparatus with a ⁴He Gaseous Target

A. Scordo^a, C. Amsler^b, M. Bazzi^a, D. Bosnar^c, M. Bragadireanu^d, M. Cargnelli^b, M. Carminati^e, A. Clozza^a, G. Deda^e, L. De Paolis^a, R. Del Grande^{a, f}, L. Fabbietti^f, C. Fiorini^f, C. Guaraldo^a, M. Iliescu^a, M. Iwasaki^g, A. Khreptak^a, P. King^e, P. Levi Sandri^a, S. Manti^a, J. Marton^f, M. Miliucci^a, P. Moskal^{h, i}, F. Napolitano^a, S. Niedźwiecki^{h, i}, H. Ohnishi^j, K. Piscicchia^{a, k}, Y. Sada^j, F. Sgaramella^a, H. Shi^b, M. Silarski^{h, i}, D.L. Sirghi^{a, d, k}, F. Sirghi^{a, d}, M. Skurzok^{a, h, i}, A. Spallone^a, K. Toho^j, M. Tüchler^b, O. Vazquez Doce^a, C. Yoshida^j, J. Zmeskal^b, C. Curceanu^a
^aLaboratori Nazionali di Frascati, INFN, Via E. Fermi 54, 00044 Frascati (Roma), Italy
^bStefan-Meyer-Institut für subatomare Physik, Kegelgasse 27, 1030 Vienna, Austria
^cDepartment of Physics, Faculty of Science, University of Zagreb, Bijenićka cesta 32, 1000 Zagreb, Croatia
^dHoria Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH), No. 30, Reactorului Street, 077125, Magurele, Romania
^ePolitecnico di Milano, Dipartimento di Elettronica, Informazione e Bioingegneria and INFN Sezione di Milano, Via G. Ponzio 34, 20133 Milano, Italy
^fPhysik Department E62, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
^gInstitute of Physical and Chemical Research, RIKEN, 2-1 Hirosawa, Wako, 351-0198 Saitama, Japan
^hFaculty of Physics, Astronomy, and Applied Computer Science, Jagiellonian University, prof. Stanisława Łojasiewicza 11, 30-348 Kraków, Poland
ⁱCenter for Theranostics, Jagiellonian University, prof. Stanisława Łojasiewicza 11, 30-348 Kraków, Poland
^jResearch Center for Electron Photon Science (ELPH), Tohoku University, 1-2-1 Mikamine, Taihaku-ku, 982-0826 Sendai, Miyagi, Japan
^kCentro Studi e Ricerche Enrico Fermi-Museo Storico della fisica e Centro Studi e Ricerche ``Enrico Fermi'', Via Panisperna 89a, 00184 Roma, Italy

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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 DAΦNE collider at the INFN National Laboratories of Frascati. Before starting the first measurement of the kaonic deuterium 2p→1s transition, an accurate evaluation of the background rejection was required, mainly achieved with the kaon trigger system. This run, performed in the period 04-26/05/2022 with a ⁴He gaseous target, confirmed the 10⁵ order of magnitude of the rejection factor obtained with the 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 start of the measurement campaign of the kaonic deuterium 2p→1s transition.

DOI:10.12693/APhysPolA.142.373
topics: kaonic atoms, machine background reduction, time-of-flight, silicon drift detectors