https://doi.org/10.1051/epjconf/20146605016
New precision era of experiments on strong interaction with strangeness at DAFNE/LNF-INFN
1 Stefan-Meyer-Institut für subatomare Physik, Boltzmanngasse 3, 1090 Wien, Austria
2 INFN, Laboratori Nazionali di Frascati, C.P. 13, Via E. Fermi 40, I-00044 Frascati ( Roma), Italy
3 Department of Physics and Astronomy, University of Victoria, P.O. Box 1700 STN CNC, Victoria BC V8W 2Y2, Canada
4 Politecnico di Milano, Dipartimento di Elettronica e Informazione, Piazza L. da Vinci 32, I-20133 Milano, Italy
5 IFIN-HH, Institutul National pentru Fizica si Inginerie Nucleara Horia Hulubei, Reactorului 30, Magurele, Romania
6 INFN Sezione di Roma I and Instituto Superiore di Sanita, I-00161 Roma, Italy
7 University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, Japan
8 RIKEN, Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
9 Excellence Cluster Universe, Technische Universität München, Boltzmannstraße 2, D-85748 Garching, Germany
10 Universidade de Santiago de Compostela, Casas Reais 8, 15782 Santiago de Compostela, Spain
a e-mail: tomoichi.ishiwatari@assoc.oeaw.ac.at
Published online: 20 March 2014
The strong-interaction shifts and widths of kaonic hydrogen, deuterium, 3He, and 4He were measured in the SIDDHARTA experiment. The most precise values of the shift and width of the kaonic hydrogen 1s state were determined to be ϵ1s = −283 ± 36(stat)±6(syst) eV and Γ1s = 541±89(stat)±22(syst) eV. The upper limit of the kaonic deuterium Kα yield was found to be ≤ 0.39%. In addition, the shifts and widths of the kaonic 3He and 4He 2p states were determined to be ϵ2p(3He) = −2 ± 2(stat) ± 4(syst) eV and Γ2p(3He) = 6 ± 6(stat) ± 7(syst) eV; ϵ2p(4He) = +5 ± 3(stat) ± 4(syst) eV and Γ2p(4He) = 14 ± 8(stat) ± 5(syst) eV. These values are important for the constraints of the low-energy 
interaction in theoretical approaches.
© Owned by the authors, published by EDP Sciences, 2014
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