Associate K^0 production in p_s16p collisions at 3.5 GeV: The role of Delta(1232)_s16_s16
Keywords
resonance: production | channel cross section: measured | angular distribution | Delta(1232)_s16_s16: intermediate state | mass spectrum | missing-mass | Sigma(1385)_s16: intermediate state | HADES | p p: exclusive reaction | K0: hadroproduction | Lambda: associated production | Sigma0: associated production | experimental results | Darmstadt SIS | p p --> Lambda p K0 pi_s16 | p p --> Sigma0 p K0 pi_s16 | 3.5 GeV-kin
Abstract
An exclusive analysis of the 4-body final states _s13_s17923_s19_s16p_s16_s13_s17960_s19_s16_s16K0 and _s13_s17931_s190_s16p_s16_s13_s17960_s19_s16_s16K0 measured with HADES for p_s16p collisions at a beam kinetic energy of 3.5 GeV is presented. The analysis uses various phase space variables, such as missing mass and invariant mass distributions, in the four particle event selection (p, _s13_s17960_s19_s16, _s13_s17960_s19_s16, _s13_s17960_s19_s13_s178722_s19) to find cross sections of the different production channels, contributions of the intermediate resonances _s13_s17916_s19_s16_s16 and _s13_s17931_s19(1385)_s16 and corresponding angular distributions. A dominant resonant production is seen, where the reaction _s13_s17923_s19_s16_s13_s17916_s19_s16_s16_s16K0 has an about ten times higher cross section (29.45±0.08_s161.67_s13_s178722_s191.46±2.06_s13_s17956_s19b) than the analogous non-resonant reaction (2.57±0.02_s160.21_s13_s178722_s191.98±0.18_s13_s17956_s19b). A similar result is obtained in the corresponding _s13_s17931_s190 channels with 9.26±0.05_s161.41_s13_s178722_s190.31±0.65 mub in the resonant and 1.35±0.02_s160.10_s13_s178722_s191.35±0.09_s13_s17956_s19b in the non-resonant reactions.
