Abstract

• In this research work, the ranges and position angles of charged particle tracks which are emitted from a single- hypernucleus event in KEK-PS E373 experiment. The positions (x, y, z) of a single-  hypernucleus event are measured in nuclear emulsion. In the analyzed event, the  - hyperon is stopped and decays into charged particles tracks #1 and #2 which has 4.270.001m range. The charged particle track #1 is a single- hypernucleus according to its decay topology (#1  #3 + #4). The ranges of charged particles tracks #1,#2, #3 and #4 are 24.7527±0.00047 m, 4.2698±0.000m, 11.9915±0.00083, and 1486.8012±0.1358 m. The measurement of position angles ( and ) of charged particles is the main work for particles identification as well as that of ranges. The position angles of charged particles tracks #1, #2, #3 and #4 are 147.1130±0.4830, 159.5224±0.2149, 101.17061±0.3360 and 73.1808±1.7845 for the zenith angle () and 2.4819±0.2775, -31.0295±0.4417, 53.10747±0.6409 and 57.1516±2.7838 for the azimuthal angle ().