Faculté des sciences

The DEAR experiment—first results on kaonic hydrogen

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

In: Nuclear Physics A, 2005, vol. 754, p. 369-374

The goal of the DEAR (DAΦNE exotic atom research) experiment is the precise determination of the isospin dependent antikaon–nucleon scattering lengths. The experiment accurately measures the Kα line shift and broadening, due to the strong interaction, in kaonic hydrogen and, for the first time, in kaonic deuterium. A precision measurement of kaonic hydrogen tests chiral symmetry... More

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    Summary
    The goal of the DEAR (DAΦNE exotic atom research) experiment is the precise determination of the isospin dependent antikaon–nucleon scattering lengths. The experiment accurately measures the line shift and broadening, due to the strong interaction, in kaonic hydrogen and, for the first time, in kaonic deuterium. A precision measurement of kaonic hydrogen tests chiral symmetry breaking in systems with strangeness. An initial analysis of the DEAR experiment yields a shift ε1s=−195±45 eV and a width Γ1s=250±125 eV, which is more precise than the previous kaonic X-ray experiment KpX at KEK, and allows for the first time to disentangle the full pattern of the kaonic hydrogen K-series line , and .