Measurements of the strong-interaction widths of the kaonic (3)He and (4)He 2p levels

SIDDHARTA Collaboration; M Bazzi; G Beer; L Bombelli; A M Bragadireanu; M Cargnelli; C Curceanu Petrascu; A Dʼuffizi; C Fiorini; T Frizzi; F Ghio; C Guaraldo; R S Hayano; M Iliescu; T Ishiwatari; M Iwasaki; P Kienle; P Levi Sandri; A Longoni; J Marton; S Okada; D Pietreanu; T Ponta; A Rizzo; A Romero Vidal; E Sbardella; A Scordo; H Shi; D L Sirghi; F Sirghi; H Tatsuno; A Tudorache; V Tudorache; O Vazquez Doce; B Wünschek; E Widmann; J Zmeskal

doi:10.1016/j.physletb.2012.06.071

Measurements of the strong-interaction widths of the kaonic (3)He and (4)He 2p levels

Phys Lett B. 2012 Jul 24;714(1):40-43. doi: 10.1016/j.physletb.2012.06.071.

Abstract

The kaonic (3)He and (4)He X-rays emitted in the [Formula: see text] transitions were measured in the SIDDHARTA experiment. The widths of the kaonic (3)He and (4)He 2p states were determined to be [Formula: see text], and [Formula: see text], respectively. Both results are consistent with the theoretical predictions. The width of kaonic (4)He is much smaller than the value of [Formula: see text] determined by the experiments performed in the 70's and 80's, while the width of kaonic (3)He was determined for the first time.