On the structure in the ΛN cross section at the ∑N threshold  

作　　者：Johann Haidenbauer Uf-G.MeiBner 

机构地区：[1]Institute for Advanced Simulation,Institut fur Kemphysik and Julich Center for Hadron Physics,Forschungszentrum Julich,D-52425 Julich,Germany [2]Helmholtz-Institut fiir Strahlen-und Kemphysik and Bethe Center for Theoretical Physics,Universitat Bonn,53115 Bonn,Germany [3]Tbilisi State University,0186 Tbilisi,Georgia

出　　处：《Chinese Physics C》2021年第9期157-166,共10页中国物理C（英文版）

基　　金：Supported in part by the Deutsche Forschungsgemeinschaft(DFG,German Research Foundation);the Sino-German Collaborative Research Center CRC 110"Symmetries and the Emergence of Structure in QCD"(DFG Project-ID 196253076-TRR 110,Grant No.12070131001);the EU(STRONG2020);the Chinese Academy of Sciences(CAS)President's International Fellowship Initiative(PIFI)(2018DM0034);VolkswagenStiftung(93562)。

摘　　要：The complexity of threshold phenomena is exemplified on a prominent and long-known case-the structure in theΛp cross section(invariant mass spectrum)at the opening of the∑N channel.The mass splitting between the∑baryons together with the angular momentum coupling in the^(3)S_(1)-^(3)D_(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 Λp and∑N scattering data,the shape of the resulting Λp cross section is discussed and the poles near the ∑N threshold are determined.Evidence for a strangeness S=-1 dibaryon is provided,in the form of a(unstable)∑N bound state in the vicinity of the ∑N threshold.Predictions for level shifts and widths of ∑^(-)p atomic states are given.

关 键 词：hyperon-nucleon interaction DIBARYON threshold effects 

分 类 号：O572[理学—粒子物理与原子核物理]