Polarization of Lambda^0 hyperons as a signature for the Quark-Gluon Plasma
Abstract
The momentum distribution of Lambda^0 hyperons produced from the quark-gluon plasma (QGP) in ultra-relativistic heavy-ion collisions is calculated in dependence on their polarization. The momentum distribution of Lambda^0 hyperons is defined by matrix elements of relativistic quark Wigner operators, which are calculated within the Effective quark model with chiral U(3)xU(3) symmetry and the Quark-Gluon transport theory. We show that the polarization of the Lambda^0 hyperon depends of the spin of the strange quark that agrees well with the DeGrand-Miettinen model. We show that Lambda^0 hyperons, produced from the QGP, are fully unpolarized. This means that a detection of unpolarized Lambda^0 hyperons, produced in ultra-relativistic heavy-ion collisions, should serve as one of the signatures for the existence of the QGP in intermediate states of ultra-relativistic heavy-ion collisions.
Keywords
Cite
@article{arxiv.nucl-th/0312045,
title = {Polarization of Lambda^0 hyperons as a signature for the Quark-Gluon Plasma},
author = {A. Ya. Berdnikov and Ya. A. Berdnikov and A. N. Ivanov and V. A. Ivanova and V. F. Kosmach and V. M. Samsonov and N. I. Troitskaya and V. Thatar Vento},
journal= {arXiv preprint arXiv:nucl-th/0312045},
year = {2008}
}
Comments
17 pages, no figure, latex