K_s~0 Λ Production in ALICE

摘要

The production of Λ and K_s~0 hadrons at the LHC can be measured through the reconstruction of their weak decay topologies via decay channels with only charged particles in the final state. The tracking and particle identification capabilities of the ALICE detector allow us to measure the spectra of these particles over a wide transverse momentum range (0.4 < p_T < 12 GeV/c), and to precisely determine the behaviour of the baryon-to-meson ratio Λ/K_s~0. Transverse momentum spectra and production yields at mid-rapidity (|y| < 0.5) for Λ and K_s~0 are presented for √s_(NN) = 2.76 TeV Pb-Pb collisions as a function of centrality. The evolution of the Λ/K_s~0 ratio is discussed, in comparison with corresponding results in pp collisions at the LHC and in √s_(NN) = 200 GeV Au-Au collisions at RHIC. Comparisons to theoretical models will also be outlined.