Polarization of Lambda^0 hyperons as a signature for the Quark-Gluon Plasma

Details Polarization of Lambda^0 hyperons as a signature for the Quark-Gluon Plasma Polarization of Lambda^0 hyperons as a signature for the Quark-Gluon Plasma

2003-12-14

arxiv.org/abs/nucl-th/0312045v1

ActaPhys.Hung.A22:139-147,2005

Physics

Nuclear Physics

Nuclear Theory

17 pages, no figure, latex

Scientific paper

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.

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