A new kaonic helium measurement in gas by SIDDHARTINO at the DAΦNE collider

Abstract

The SIDDHARTINO experiment at the DAΦNE Collider of INFN-LNF, the pilot run for the SIDDHARTA-2 experiment which aims to perform the measurement of kaonic deuterium transitions to the fundamental level, has successfully been concluded. The paper reports the main results of this run, including the optimization of various components of the apparatus, among which the degrader needed to maximize the fraction of kaons stopped inside the target, through measurements of kaonic helium transitions to the 2p level. The obtained shift and width values are ε_2p = E_exp-E_e.m = 0.2 {\pm} 2.5(stat) {\pm} 2(syst) eV and Γ_2p = 8 {\pm} 10 eV (stat), respectively. This new measurement of the shift, in particular, represents the most precise one for a gaseous target and is expected to contribute to a better understanding of the kaon-nuclei interaction at low energy.

References in corpus (5)

• Precision measurement of the $3d\to 2p$ x-ray energy in kaonic ${}^4$He
• S-Wave Scattering of Fermion Revisited
• Beam-Beam Issues for Colliding Schemes with Large Piwinski Angle and Crabbed Waist
• Measurements of the strong-interaction widths of the kaonic 3He and 4He 2p levels
• Characterization of the SIDDHARTA-2 luminosity monitor

Cited by in corpus (4)

• Measurements of high-n transitions in intermediate mass kaonic atoms by SIDDHARTA-2 at DA$\mathrm{\Phi }$NE
• First measurement of kaonic helium-4 M-series transitions
• First Linearity and Stability Characterization for CZT Detection System in a e${}^{+}$e${}^{-}$ Collider Environment
• First tests of the full SIDDHARTA-2 experimental apparatus with a 4 He gaseous target