Abstract
Data on Λ's andK 0's, produced in central nucleus-nucleus collisions (C−C, C−Ne, O−Ne, C−Cu, C−Zr, C−Pb, O−Pb) at a 4.5 GeV/c momentum per incident nucleon obtained in the streamer chamber spectrometer SKM-200, are presented. Multiplicities, transverse momenta, rapidities and other characteristics are considered and compared with those for inelastic He−Li interactions. The polarization of Λ's was found to be consistent with zero. The upper limit of\(\bar \Lambda /\Lambda \) production ratio was estimated to be ≤10−2 with a 90% confidence level. The results are compared with data of other experiments and some model calculations.
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The polarization of Λ's observed experimentally,P(ΛTOT) is expected to be less than that for Λ's directly produced,P(ΛPROMPT) because of the admixture of Λ's from Σ0 decays. The effect can be estimated from the formula (R. Gatto: Phys. Rev.109, 610 (1958)\(P(\Lambda _{TOT} ) = P(\Lambda _{PROMPT} ) \cdot \frac{{\sigma (\Lambda _{PROMPT} )}}{{\sigma (\Lambda _{TOT} )}} - \frac{1}{3}P(\Sigma ^0 )\frac{{\sigma (\Sigma ^0 )}}{{\sigma (\Lambda _{TOT} )}}.\) Thus the observed polarization is expected to be diminished at our energy by about 30% under the assumptions that\(\sigma (\Sigma ^0 )/\sigma (\Lambda _{TOT} ) \approx \tfrac{1}{4}\) and\(P(\Lambda ) \approx P(\Sigma ^0 )\)
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Anikina, M., Aksinenko, V., Dementiev, E. et al. Characteristics of Λ andK 0 particles produced in central nucleus nucleus collisions at a 4.5 GeV/c momentum per incident nucleon. Z. Phys. C - Particles and Fields 25, 1–11 (1984). https://doi.org/10.1007/BF01571951
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DOI: https://doi.org/10.1007/BF01571951