Asymmetries in the production of Lambda(0) in 250 GeV/c pi(+/-), K-+/- and p-nucleon interactions

摘要

Using data from Fermilab fixed-target experiment E769, we have measured particle-antiparticle production asymmetries for Lambda(0) hyperons in 250 GeV/c pi(+/-), K+/- and p-nucleon interactions. The asymmetries are measured as functions of Feynman-chi (chi(F)) and p(T)(2) over the ranges -0.12 less than or equal to chi(F) less than or equal to 0.12 and 0 less than or equal to P-T(2) less than or equal to 3 (GeV/c)(2) (for positive beam) and -0.12 less than or equal to chi(F) less than or equal to 0.4 and 0 less than or equal to P-T(2) less than or equal to 10 (GeV/c)(2) (for negative beam). We find substantial asymmetries, even at chi(F) around zero. We also observe leading-particle-type asymmetries. These latter effects are qualitatively as expected from valence-quark content of the target and variety of projectiles studied. (C) 2003 Published by Elsevier Science B.V. [References: 31]