https://doi.org/10.1140/epja/s10050-020-00261-2
Regular Article - Experimental Physics
$$\varLambda $$ and $$\varSigma $$ Excitations and the Quark Model
1
Helmholtz–Institut für Strahlen–und Kernphysik, Universität Bonn, 53115, Bonn, Germany
2
Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, USA
3
Institute of Nuclear Physics, Universität Mainz, 55099, Mainz, Germany
4
Department of Physics, George Washington University, Washington, DC, 20052, USA
* e-mail: klempt@hiskp.uni-bonn.de
Received:
7
July
2020
Accepted:
19
September
2020
Published online:
13
October
2020
The spectrum of $$\varLambda $$ and $$\varSigma $$ excitations is reviewed taking into account (nearly) all hyperon resonances which were seen in early analyses or in one of the recent partial-wave analyses. The spectrum is compared with the old Isgur–Karl model and the Bonn model. These models allows us to discuss the SU(3) structure of the observed resonances. The SU(3) decomposition is compared with SU(6) relations between the different decay modes. Seven $$\varLambda $$ states are proposed to be classified as SU(3) singlet states. The hyperon spectrum is compared with the spectrum of N and $$\varDelta $$ resonances.
© The Author(s), 2020
