Longitudinal polarization in heavy-ion collisions as a probe for QGP formation
Depto. de Física del Centro de Investigación y de Estudios Avanzados del IPN, Apartado postal 14-740, 07000, México D.F., México
2 Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud 150 - CEP, 22290-180, Rio de Janeiro, Brazil
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We present an analysis of the longitudinal polarization in ultrarelativistic heavy-ion collisions. The polarization of ’s coming from the decay chain exhibits a very well differentiated behavior depending on the production region of the primordial ’s. This effect reflects the different values of the 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 polarization signals a strangeness enhancement which is thought of as a property of the QGP phase.
© Springer-Verlag, 2005