Indication of a strange tribaryon S^+ from the ^4He(stopped K^-,n) reaction

Details Indication of a strange tribaryon S^+ from the ^4He(stopped K^-,n) reaction Indication of a strange tribaryon S^+ from the ^4He(stopped K^-,n) reaction

2003-10-17

arxiv.org/abs/nucl-ex/0310018v2

Physics

Nuclear Physics

Nuclear Experiment

13 pages, 7 figures, updated because of new reslut found in PLB597(2004)263

Scientific paper

We measured the neutron time-of-flight spectrum in the ^4He(stopped K^-, n) reaction by stopping negative kaons in a superfluid helium target. A clear enhancement was observed in the neutron spectrum, which indicates the formation of a strange tribaryon of charge +1 with a mass and width of M = 3141 +/- 3 (stat.) +4/-1 (sys.) MeV/c^2 and G < 23 MeV/c^2. This state, denoted as S^+(3140), is about 25 MeV/c^2 higher than the previously observed S^0(3115) T=1.

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