https://doi.org/10.1140/epjc/s2004-02073-2
theoretical physics
Longitudinal 
polarization in heavy-ion collisions as a probe for QGP formation
1
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
* e-mail: gherrera@fis.cinvestav.mx
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
