Λ and overlineΛ production in K +p interactions at 32 GeV/ c
Abstract
A study of the inclusive and semi-inclusive Λ and overlineΛ production in K +p interactions at 32 GeV/ c is presented. The inclusive cross sections for Λ and overlineΛ amount to 0.78 ± 0.05 and 0.42 ± 0.04 mb thus showing a remarkable growth between 16 and 32 GeV/ c with a factor of 1.7 for Λ and 2.8 for overlineΛ. Target and beam fragmentation processes are found to be dominant for Λ and overlineΛ production respectively with the following lower limits for the corresponding cross sections: σ(p limit→K +ʌ) > 0.5 mb and σ(K +limit→poverlineʌ) > 0.3 mb. Although the early scaling conditions are fulfilled for the Λ production in the target fragmentation region, and overlineΛ production in the beam fragmentation region, scaling is not observed between 16 and 32 GeV/ c in the x and pT2 Feynman variables. The Λ production is found to be very similar in the K +p inclusive reaction at 32 GeV/ c and in the semi-inclusive reaction K-p→ Λ K overlineKX at the same energy. The Λ overlineΛ pair production cross section increases significantly in K +p interactions from 16 to 32 GeV/ c where it reaches the value σ Λ overlineΛ = 47 ± 11 μ b. The cross sections for Λ or overlineΛ produced in association with an identified proton are also given and discussed.
- Publication:
-
Nuclear Physics B
- Pub Date:
- November 1977
- DOI:
- 10.1016/0550-3213(77)90187-0
- Bibcode:
- 1977NuPhB.131...93C