The pion emission source in Au+Au collisions is tilted with magnitude decreasing rapidly as collision energy rises from 7.7 to 27 GeV, indicating departure from longitudinal boost invariance.
Global hyperon polarization at local thermodynamic equilibrium with vorticity, magnetic field and feed-down
3 Pith papers cite this work. Polarity classification is still indexing.
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abstract
The system created in ultrarelativistic nuclear collisions is known to behave as an almost ideal liquid. In non-central collisions, due to the large orbital momentum, such a system might be the fluid with the highest vorticity ever created under laboratory conditions. Particles emerging from such a highly vorticous fluid are expected to be globally polarized with their spins on average pointing along the system angular momentum. Vorticity-induced polarization is the same for particles and antiparticles, but the intense magnetic field generated in these collisions may lead to the splitting in polarization. In this paper we outline the thermal approach to the calculation of the global polarization phenomenon for particles with spin and we discuss the details of the experimental study of this phenomenon, estimating the effect of feed-down. A general formula is derived for the polarization transfer in two-body decays and, particularly, for strong and electromagnetic decays. We find that accounting for such effects is crucial when extracting vorticity and magnetic field from the experimental data.
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In a rigidly rotating free Fermi gas, the relativistic Barnett effect produces different Fermi energies for spin-up and spin-down fermions, leading to a moment of inertia that scales as 1/T at high temperature, analogous to the Curie law.
A Core-Corona model with field-theoretic vortical polarization computes the excitation function of global Lambda polarization in heavy-ion collisions and predicts a robust maximum near 3 GeV.
citing papers explorer
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Tilted geometry of the pion emission source in Au+Au collisions in the RHIC Beam Energy Scan
The pion emission source in Au+Au collisions is tilted with magnitude decreasing rapidly as collision energy rises from 7.7 to 27 GeV, indicating departure from longitudinal boost invariance.
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Relativistic Barnett effect and Curie law in a rigidly rotating free Fermi gas
In a rigidly rotating free Fermi gas, the relativistic Barnett effect produces different Fermi energies for spin-up and spin-down fermions, leading to a moment of inertia that scales as 1/T at high temperature, analogous to the Curie law.
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Excitation function for global \Lambda polarization in relativistic heavy ion collisions with the Core Corona model
A Core-Corona model with field-theoretic vortical polarization computes the excitation function of global Lambda polarization in heavy-ion collisions and predicts a robust maximum near 3 GeV.