Observation of a {sup 4}{sub {ital {Sigma}}}He Bound State in the {sup 4}He({ital K}{sup {ital {minus}}}{ital ,{pi}}{sup {ital {minus}}}) Reaction at 600 MeV/c

Journal Article · Sun Feb 01 04:00:00 EST 1998 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.80.1605· OSTI ID:609811

Nagae, T; Miyachi, T; Fukuda, T; Outa, H; Tamagawa, T; Nakano, J ^[1]; Hayano, R S; Tamura, H; Shimizu, Y; Kubota, K ^[2]; Chrien, R E; Sutter, R; Rusek, A ^[3]; Briscoe, W J ^[4]; Sawafta, R ^[5]; Hungerford, E V; Empl, A ^[6]; Naing, W ^[7]; Neerman, C; Johnston, K ^[8] ; Planinic, M ^[9]

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1. Institute for Nuclear Study, University of Tokyo, Tanashi, Tokyo 188 (Japan)
2. University of Tokyo, Bunkyo, Tokyo 113 (Japan)
3. Brookhaven National Laboratory, Upton, New York 11973 (United States)
4. Brookhaven National Laboratory/the Department of Physics and Center for Nuclear Studies, The George Washington University, Washington, D.C. 20052 (United States)
5. North Carolina AT State University, Greensboro, North Carolina 27411 (United States)
6. University of Houston, Houston, Texas 77204 (United States)
7. Hampton University, Hampton, Virginia 23668 (United States)
8. Department of Physics, Louisiana Tech University, Ruston, Louisiana 71272 (United States)
9. Zagreb University, P.O. Box 162 Bijenicka c.32, HR-10 004 Zagreb (Croatia)

We have observed a clear peak below the {Sigma}{sup +} -production threshold in the {sup 4}He( K{sup {minus}},{pi}{sup {minus}}) reaction at 600 MeV/c and {theta}{sub K{pi}}=4{sup {circ}} . This is confirmation of the existence of the bound state of {sup 4}{sub {Sigma}}He , which was reported in the {sup 4}He(stopped K{sup {minus}},{pi}{sup {minus}}) reaction. As in the case of stopped kaons, no such peak was found in the {sup 4}He(K{sup {minus}} ,{pi}{sup +}) spectrum. Quantitatively reliable parameters for this level have been established. The binding energy and the width of the bound state are 4.4{plus_minus}0.3(stat){plus_minus}1(syst ) MeV and 7.0{plus_minus}0.7(stat){sup +1.2}{sub {minus}0.0}(syst) MeV, respectively. {copyright} {ital 1998} {ital The American Physical Society}

• Research Organization: Brookhaven National Laboratory
• DOE Contract Number: AC02-76CH00016; AS05-76ER03948
• OSTI ID: 609811
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 8 Vol. 80; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BINDING ENERGY
BOUND STATE
HELIUM 4 TARGET
KAON MINUS REACTIONS
MEV RANGE 100-1000
PIONS MINUS