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

Abstract

We present an analysis of the longitudinal ${\bar{\Lambda }}_0$ polarization in ultra-relativistic heavy-ion collisions. The polarization of ${\bar{\Lambda }}_0$'s coming from the decay chain $\bar{\Xi }\to {\bar{\Lambda }}_0+\pi$ 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 as a property of the QGP phase.

arXiv commentLatex file, 12 pages, 5 figures. To appear in Eur. Phys. J. C

References in corpus (5)

• Multi-Strange Baryon Production in Au-Au collisions at sqrt(s_NN) = 130 GeV
• Mid-rapidity $\Lambda$ and $\bar{\Lambda }$ Production in Au+Au Collisions at $\sqrt{s_{{}_{NN}}}=130$ GeV
• J/Psi Suppression in Pb-Pb Collisions: A Hint of Quark-Gluon Plasma Production?
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Cited by in corpus (1)

• Polarization of Lambda^0 hyperons in nucleus-nucleus collisions at high energies