QCD analysis of Lambda hyperon production in DIS target-fragmentation region

Abstract

We consider Lambda-hyperon production in the target-fragmentation region of semi-inclusive deep-inelastic scattering within the framework of fracture functions. We present a first attempt to determine the flavour and energy dependences of these non-perturbative distributions through a simultaneous QCD-based fit to available neutral- and charged-current semi-inclusive-DIS cross sections. Predictions based on the resulting nucleon-to-Lambda fracture functions are in good agreement with data and observables not included in the regression. The successful prediction of the $Q^2$ dependence of the Lambda multiplicity notably represents the first validation of the perturbative framework implied by fracture functions.

Comments: Detailed comparison to quark-gluon string model added together with 3 additional plots. Three references added. Conclusions unchanged. Minor corrections to the text. 18 pages, 18 figures, 3 tables