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Observation of kaonic hydrogen atom X-ray |
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| Authors: | S.N. Nakamura K. Bartlett G.A. Beer G.R. Gill R.S. Hayano T.M. Ito M. Iwasaki L. Lee G. Mason A. Olin H. Outa M. Salomon R. Seki T. Taniguchi T.P. Terada G. Trayling Y. Yamashita S. Yen |
| Affiliation: | (1) Muon Science Laboratory, The Institute of Physical and Chemical Research (RIKEN), Saitama 351-0198, Japan;(2) Department of Physics and Astronomy, University of Victoria, Box 3055, Victoria, BC, Canada, V8W 3P6;(3) TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, Canada, V6T 2A3;(4) Department of Physics, University of Tokyo, Tokyo 113-8654, Japan;(5) W.K. Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, CA 91125, USA;(6) Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan;(7) Department of Physics, University of Manitoba, Winnipeg, MB, Canada, R3T 2N2;(8) High Energy Accelerator Research Organization (KEK), Ibaraki o305-0801, Japan |
| Abstract: | We successfully observed clear K-series kaonic hydrogen X-rays for the first time taking advantage of two charged pions tagging technique and a gaseous hydrogen target. The strong-interaction energy shift and width of 1s state of K −p atom were determined to be ΔE 1s = -323 ± 63 (statistical) ± 11 (systematic) eV and Г1s = 407 ± 208 ± 100 eV. Our result means that the K −p strong interaction near threshold is repulsive and the long-standing kaonic hydrogen puzzle is solved. This revised version was published online in August 2006 with corrections to the Cover Date. |
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