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Longitudinal \(\bar{\Lambda}_0\) polarization in heavy-ion collisions as a probe for QGP formation

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Abstract.

We present an analysis of the longitudinal \(\bar{\Lambda}_0\) polarization in ultrarelativistic heavy-ion collisions. The polarization of \(\bar{\Lambda}_0\)’s coming from the decay chain \(\bar{\Xi}\rightarrow \bar{\Lambda}_0 + \pi\) exhibits a very well differentiated behavior depending on the production region of the primordial \(\bar{\Xi}\)’s. This effect reflects the different values of the \(N_{\bar{\Xi}}/N_{\bar{\Lambda}_0}\) 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 \(\bar{\Lambda}_0\) polarization signals a strangeness enhancement which is thought of as a property of the QGP phase.

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Correspondence to G. Herrera.

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Received: 21 September 2004, Revised: 25 October 2004, Published online: 17 December 2004

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Herrera, G., Magnin, J. & Montaño, L.M. Longitudinal \(\bar{\Lambda}_0\) polarization in heavy-ion collisions as a probe for QGP formation. Eur. Phys. J. C 39, 95–99 (2005). https://doi.org/10.1140/epjc/s2004-02073-2

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  • DOI: https://doi.org/10.1140/epjc/s2004-02073-2

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