Abstract
The production of Λ and K0S 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 < pT < 12 GeV/c), and to precisely determine the behaviour of the baryon-to-meson ratio Λ/K0S.Transverse momentum spectra and production yields at mid-rapidity (|y| < 0.5) for Λ and K0S are presented for = 2.76 TeV Pb-Pb collisions as a function of centrality. The evolution of the Λ/K0S ratio is discussed, in comparison with corresponding results in pp collisions at the LHC and in = 200 GeV Au-Au collisions at RHIC. Comparisons to theoretical models will also be outlined.
Highlights
Relativistic collisions of heavy ions can be used to study the behaviour of strongly-interacting matter as it undergoes a phase transition from a quark-gluon plasma to a hadronic phase
It was observed at the Super Proton Synchotron (SPS) [1] and at the Relativistic Heavy Ion Collider (RHIC) [2, 3] that ratios of pT spectra for baryons and mesons, such as p/π and Λ/K0S are enhanced at intermediate pT, when compared to the corresponding ratios in pp collisions
It can be seen that the ratio in pp collisions does not appear to depend upon the collision energy, and that the ratio in the most peripheral Pb–Pb collisions (80-90% centrality) is consistent with that measured in pp collisions
Summary
Relativistic collisions of heavy ions can be used to study the behaviour of strongly-interacting matter as it undergoes a phase transition from a quark-gluon plasma to a hadronic phase. ∼6 GeV/c the ratio is compatible with that measured in pp collisions, and so it is expected that vacuumlike fragmentation will dominate hadron production. A precise measurement of these ratios over a broad transverse momentum range for a wide selection of energies and centrality intervals is important for examining the interplay between these different mechanisms.
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