Longitudinal Λ0 polarization in heavy ion collisions as a probe for QGP formation
G. Herrera, J. Magnin, L. M. Montaño
Abstract
We present an analysis of the longitudinal Λ0 polarization in ultra-relativistic heavy-ion collisions. The polarization of Λ0's coming from the decay chain Ξ Λ0+π exhibits a very well differentiated behavior depending on the production region of the primordial Ξ's. This effect reflects the different values of the N Ξ/N Λ0 ratio in the QGP region, where nucleon-nucleon interactions take place in a hot and dense environment, and the peripherical region, in which ordinary nucleon-nucleon interactions occur. An increase in the longitudinal Λ0 polarization signals a strangeness enhancement which is thought as a property of the QGP phase.
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