Kaonic hydrogen atoms provide a unique laboratory to probe the kaon-nucleon strong interaction at the energy threshold, allowing an investigation of the interplay between spontaneous and explicit chiral symmetry breaking in low-energy QCD. The SIDDHARTA Collaboration has measured the K-series X rays of kaonic hydrogen atoms at the DAΦNE electron-positron collider of Laboratori Nazionali di Frascati, and has determined the most precise values of the strong-interaction induced shift and width of the 1s atomic energy level. This result provides vital constraints on the theoretical description of the low-energy KˉN interaction.
@article{arxiv.1201.4635,
title = {Kaonic hydrogen X-ray measurement in SIDDHARTA},
author = {M. Bazzi and G. Beer and L. Bombelli and A. M. Bragadireanu and M. Cargnelli and G. Corradi and C. Curceanu and A. d'Uffizi and C. Fiorini and T. Frizzi and F. Ghio and C. Guaraldo and R. S. Hayano and M. Iliescu and T. Ishiwatari and M. Iwasaki and P. Kienle and P. Levi Sandri and A. Longoni and V. Lucherini and J. Marton and S. Okada and D. Pietreanu and T. Ponta and A. Rizzo and A. Romero Vidal and A. Scordo and H. Shi and D. L. Sirghi and F. Sirghi and H. Tatsuno and A. Tudorache and V. Tudorache and O. Vazquez Doce and E. Widmann and J. Zmeskal},
journal= {arXiv preprint arXiv:1201.4635},
year = {2012}
}
Comments
11 pages, 7 figures, Nuclear Physics A (in press) Special Issue on Strangeness Nuclear Physics