Kaonic hydrogen X-ray measurement in SIDDHARTA

Details Kaonic hydrogen X-ray measurement in SIDDHARTA Kaonic hydrogen X-ray measurement in SIDDHARTA

2012-01-23

arxiv.org/abs/1201.4635v1

Physics

Nuclear Physics

Nuclear Experiment

11 pages, 7 figures, Nuclear Physics A (in press) Special Issue on Strangeness Nuclear Physics

Scientific paper

10.1016/j.nuclphysa.2011.12.008

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 DA$\Phi$NE 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 $\bar{K}N$ interaction.

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