Polarization of Λ0 hyperons as a signature for the quark-gluon plasma |
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| Authors: | A Ya Berdnikov Ya A Berdnikov A N Ivanov V A Ivanova V F Kosmach V M Samsonov N I Troitskaya V Thatar Vento |
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| Institution: | 1. Department of Nuclear Physics, State Polytechnic University of St. Petersburg, Thorez Prospekt, 40-3-9, 194223, St. Petersburg, Russia
2. Atomic Institute of the Austrian Universities at Vienna University of Technology and Institute of Medium Energy Physics of the Austrian Academy of Sciences, Karlsplatz 13, 1040, Vienna, Austria
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| Abstract: | The momentum distribution of Λ0 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 Λ0 hyperons is defined by matrix elements of relativistic quark Wigner operators, which are calculated within the effective quark model with chiral U(3)×U(3) symmetry and the quark-gluon transport theory. We show that the polarization of the Λ0 hyperon depends on the spin of the strange quark that agrees well with the DeGrand-Miettinen model. We show that Λ0 hyperons, produced from the QGP, are fully unpolarized. This means that a detection of unpolarized Λ0 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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