Trigger rejection factor in the first kaonic helium run with the complete SIDDHARTA-2 setup
oleh: 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.
| Format: | Article |
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| Diterbitkan: | EDP Sciences 2022-01-01 |
Deskripsi
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.