Measurement of D+ and Lambda_c+ production in deep inelastic scattering at HERA

                            ZEUS Collaboration

                                Abstract

Charm production in deep inelastic scattering has been measured with the 
ZEUS detector at HERA using an integrated luminosity of 120 pb-1. The 
hadronic decay channels D+ -> K0S pi+, Lambda_c+ -> p K0S and Lambda_c+ -> 
Lambda pi+, and their charge conjugates, were reconstructed. The presence 
of a neutral strange hadron in the final state reduces the combinatorial 
background and extends the measured sensitivity into the low transverse 
momentum region. The kinematic range is 0 < pT(D+,Lambda_c+) < 10GeV, 
|eta(D+,Lambda_c+)| < 1.6, 1.5 < Q2 < 1000GeV2 and 0.02 < y < 0.7. 
Inclusive and differential cross sections for the production of D+ mesons 
are compared to next-to-leading-order QCD predictions. The fraction of c 
quarks hadronising into Lambda_c+ baryons is extracted.