Reconstruction over a large rapidity interval of Λ, Λ-bar and Ks0 in the NA49 experiment

The NA49 experiment is able to measure the production of neutral strange baryons and mesons along with other hadronic species in Pb+Pb collisions at 158 GeV per nucleon. These strange particles are an important piece of evidence in the search for the quark-gluon plasma. They have been reconstructed from their charged decay products recorded in the experiment's time projection chambers. A new round of data production has been undertaken with improved software, allowing the reconstruction of neutral strange particles over a rapidity interval covering both sides of mid-rapidity. The procedures used to obtain this sample are outlined and a comparison of the phase space coverage with respect to previous measurements is made. (author)