期刊
CHINESE PHYSICS C
卷 45, 期 9, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1674-1137/ac0e89
关键词
hyperon-nucleon interaction; dibaryon; threshold effects
资金
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)
- NSFC [196253076 - TRR 110, 12070131001, CRC 110]
- EU
- Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) [2018DM0034]
- VolkswagenStiftung [93562]
The complexity of threshold phenomena is exemplified by the structure in the Lambda p cross section at the opening of the Sigma N channel. The mass splitting between the Sigma baryons and angular momentum coupling in the S-3(1) - D-3(1) partial wave imply the involvement of up to six channels. Evidence for a strangeness S = -1 dibaryon is provided with predictions for level shifts and widths of Sigma(-)p atomic states.
The complexity of threshold phenomena is exemplified on a prominent and long-known case - the structure in the Lambda p cross section (invariant mass spectrum) at the opening of the Sigma N channel. The mass splitting between the Sigma baryons together with the angular momentum coupling in the S-3(1) - D-3(1) partial wave imply that, in principle, up to six channels are involved. Utilizing hyperon-nucleon potentials that provide an excellent description of the available low-energy Lambda p and Sigma N scattering data, the shape of the resulting Lambda p cross section is discussed and the poles near the Sigma N threshold are determined. Evidence for a strangeness S = -1 dibaryon is provided, in the form of a (unstable) Sigma N bound state in the vicinity of the Sigma N threshold. Predictions for level shifts and widths of Sigma(-)p atomic states are given.
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