Observation of a 4ΣHe Bound State in the H4e(K−,π−) Reaction at 600MeV/c

Nagae, T. and Miyachi, T. and Fukuda, T. and Outa, H. and Tamagawa, T. and Nakano, J. and Hayano, R. S. and Tamura, H. and Shimizu, Y. and Kubota, K. and Chrien, R. E. and Sutter, R. and Rusek, A. and Briscoe, W. J. and Sawafta, R. and Hungerford, E. V. and Empl, A. and Naing, W. and Neerman, C. and Johnston, K. and Planinić, Mirko (1998) Observation of a 4ΣHe Bound State in the H4e(K−,π−) Reaction at 600MeV/c. Physical Review Letters, 80 (8). pp. 1605-1609. ISSN 0031-9007

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We have observed a clear peak below the Σ+-production threshold in the 4He(K−,π−) reaction at 600MeV/c and θKπ=4∘. This is confirmation of the existence of the bound state of 4ΣHe, which was reported in the 4He(stoppedK−,π−) reaction. As in the case of stopped kaons, no such peak was found in the 4He(K−,π+) spectrum. Quantitatively reliable parameters for this level have been established. The binding energy and the width of the bound state are 4.4±0.3(stat)±1(syst) MeV and 7.0±0.7(stat)+1.2−0.0(syst) MeV, respectively.

Item Type: Article
Keywords: production tresholdin, He Bound State
Date: February 1998
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (1998) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119205
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 08 Jul 2014 09:35
Last Modified: 08 Jul 2014 09:35
URI: http://digre.pmf.unizg.hr/id/eprint/1322

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