Journal
PHYSICS LETTERS B
Volume 704, Issue 3, Pages 113-117Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2011.09.011
Keywords
Kaonic atoms; Low-energy QCD; Antikaon-nucleon physics; X-ray detection
Funding
- European Community [RII3-CT-2004-506078]
- European Community under EU [227431]
- Austrian Federal Ministry of Science and Research BMBWK [650962/0001, VI/2/2009]
- Romanian National Authority for Scientific Research [2-CeX 06-11-11/2006]
- MEXT, Japan [20002003]
- Grants-in-Aid for Scientific Research [10J00295] Funding Source: KAKEN
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The (K) over barN system at threshold is a sensitive testing ground for low energy QCD, especially for the explicit chiral symmetry breaking. Therefore, we have measured the K-series X-rays of kaonic hydrogen atoms at the DA Phi NE electron-positron collider of Laboratori Nazionali di Frascati, and have determined the most precise values of the strong-interaction energy-level shift and width of the Is atomic state. As X-ray detectors, we used large-area silicon drift detectors having excellent energy and timing resolution, which were developed especially for the SIDDHARTA experiment. The shift and width were determined to be epsilon(1s) = -283 +/- 36(stat) +/- 6(syst) eV and Gamma(1s) = 541 +/- 89(stat) +/- 22(syst) eV, respectively. The new values will provide vital constraints on the theoretical description of the low-energy (K) over barN interaction. (C) 2011 Elsevier B.V. All rights reserved.
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