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Phys. Rev. Lett. 80, 1605–1609 (1998)

Observation of a Σ4He Bound State in the 4He(K-,π-) Reaction at 600 MeV/c

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T. Nagae, T. Miyachi, T. Fukuda, H. Outa, T. Tamagawa, and J. Nakano*
Institute for Nuclear Study, University of Tokyo, Tanashi, Tokyo 188, Japan

R. S. Hayano, H. Tamura†, Y. Shimizu‡, and K. Kubota
University of Tokyo, Bunkyo, Tokyo 113, Japan

R. E. Chrien, R. Sutter, and A. Rusek
Brookhaven National Laboratory, Upton, New York 11973

W. J. Briscoe
Brookhaven National Laboratory/the Department of Physics and Center for Nuclear Studies, The George Washington University, Washington, D.C. 20052

R. Sawafta
North Carolina A&T State University, Greensboro, North Carolina 27411

E. V. Hungerford and A. Empl
University of Houston, Houston, Texas 77204

W. Naing
Hampton University, Hampton, Virginia 23668

C. Neerman and K. Johnston
Department of Physics, Louisiana Tech University, Ruston, Louisiana 71272

M. Planinic
Zagreb University, P.O. Box 162 Bijenička c. 32, HR-10 004 Zagreb, Croatia

Received 11 September 1997; published in the issue dated 23 February 1998

We have observed a clear peak below the Σ+-production threshold in the 4He(K-,π-) reaction at 600 MeV/c and θKπ = 4∘. This is confirmation of the existence of the bound state of Σ4He, 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)-0.0+1.2(syst) MeV, respectively.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.80.1605
DOI:
10.1103/PhysRevLett.80.1605
PACS:
21.80.+a, 21.45.+v, 25.80.Nv

*Present address: KEK, 1-1 Oho, Tsukuba, Ibaraki 305, Japan.

†Present address: Tohoku University, Sendai, Miyagi 980-77, Japan.

‡Present address: Osaka University, Toyonaka, Osaka 560, Japan.

 
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