EPJ Web of Conferences (Jan 2022)

Trigger rejection factor in the first kaonic helium run with the complete SIDDHARTA-2 setup

  • De Paolis L.,
  • Bazzi M.,
  • Bosnar D.,
  • Bragadireanu M.,
  • Cargnelli M.,
  • Carminati M.,
  • Clozza A.,
  • Deda G.,
  • Del Grande R.,
  • Fabbietti L.,
  • Fiorini C.,
  • Friščić I.,
  • Guaraldo C.,
  • Iliescu M.,
  • Iwasaki M.,
  • Khreptak A.,
  • King P.,
  • Sandri P. Levi,
  • Manti S.,
  • Marton J.,
  • Miliucci M.,
  • Moskal P.,
  • Napolitano F.,
  • Niedźwiecki S.,
  • Ohnishi H.,
  • Piscicchia K.,
  • Sada Y.,
  • Scordo A.,
  • Sgaramella F.,
  • Shi H.,
  • Silarski M.,
  • Sirghi D.L.,
  • Sirghi F.,
  • Skurzok M.,
  • Spallone A.,
  • Toho K.,
  • Tüchler M.,
  • Doce O. Vazquez,
  • Yoshida C.,
  • Zmeskal J.,
  • Curceanu C.

DOI
https://doi.org/10.1051/epjconf/202227000028
Journal volume & issue
Vol. 270
p. 00028

Abstract

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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.