Tracking performance for long-lived particles at LHCb

The LHCb experiment is dedicated to the study of the c- and b-hadron decays, including long-lived particles such as Ks and strange baryons . These kind of particles are difficult to reconstruct by the LHCb tracking system since they escape detection in the first tracker. A new method to evaluate the performance of the different tracking algorithms for long-lived particles using real data samples has been developed. Special emphasis is laid on particles hitting only part of the tracking system of the new LHCb upgrade detector.