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Vortex rings from high energy central p+A collisions
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Relativistic p+A collisions may produce droplets of quark gluon plasma (QGP) that quickly develop a toroidal vortex structure similar to that of an expanding smoke ring. We present viscous relativistic hydrodynamic calculations of ultra-central p+A collisions and develop an experimental observable to probe the structure, correlating the polarization and momentum of hyperons emitted from the collision. The effect is robust against changes in the definition of vorticity used to calculate the polarization. Experiments at RHIC and LHC may test the existence and strength of the vortex toroids, bringing new evidence to bear on the question of collectivity in the smallest QGP droplets.
Forward citations
Cited by 2 Pith papers
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Event-by-event vortex rings in fixed-target p+Ar collisions
Hydrodynamic simulations predict lambda polarization in p+Ar collisions that is six times larger for strong early longitudinal flow than for Bjorken flow, with an anti-lambda sign flip at weak flow, testable at LHCb SMOG.
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Causality of polarizeable dissipative fluids from Lagrangian hydrodynamics
In a Lagrangian model of polarized dissipative fluids, causality couples the spin, shear, and bulk relaxation times through inequalities that can make polarization mask viscosity.
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