Measurement of the kaonic hydrogen x-ray spectrum

G Beer; A M Bragadireanu; M Cargnelli; C Curceanu-Petrascu; J-P Egger; H Fuhrmann; C Guaraldo; M Iliescu; T Ishiwatari; K Itahashi; M Iwasaki; P Kienle; T Koike; B Lauss; V Lucherini; L Ludhova; J Marton; F Mulhauser; T Ponta; L A Schaller; R Seki; D L Sirghi; F Sirghi; J Zmeskal; DEAR Collaboration

doi:10.1103/PhysRevLett.94.212302

Measurement of the kaonic hydrogen x-ray spectrum

Phys Rev Lett. 2005 Jun 3;94(21):212302. doi: 10.1103/PhysRevLett.94.212302. Epub 2005 Jun 2.

Affiliation

¹ Department of Physics and Astronomy, University of Victoria, P. O. Box 3055, Victoria, British Columbia V8W 3P6, Canada.

PMID: 16090312
DOI: 10.1103/PhysRevLett.94.212302

Abstract

The DEAR (DAPhiNE exotic atom research) experiment measured the energy of x rays emitted in the transitions to the ground state of kaonic hydrogen. The measured values for the shift epsilon and the width Gamma of the 1s state due to the K(-)p strong interaction are epsilon(1s)=-193 +/- 37 (stat) +/- 6 (syst) eV and Gamma(1s)=249 +/- 111 (stat) +/- 30 (syst) eV, the most precise values yet obtained. The pattern of the kaonic hydrogen K-series lines, K(alpha), K(beta), and K(gamma), was disentangled for the first time.