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We study the relaxation time required for the alignment between the spin of afinite-mass quark/antiquark and the thermal vorticity, at finite temperatureand baryon chemical potential, in the context of relativistic heavy-ioncollisions. The relaxation time is computed as the inverse of the totalreaction rate that in turn is obtained from the imaginary part of thequark/antiquark self-energy. We model the interaction between spin and thermalvorticity within the medium by means of a vertex coupling quarks and thermalgluons that, for a uniform temperature, is proportional to the global angularvelocity and inversely proportional to the temperature. We use realisticestimates for the angular velocities for different collision energies and showthat the effect of the quark mass is to reduce the relaxation times as comparedto the massless quark case. Using these relaxation times we estimate theintrinsic quark and antiquark polarizations produced by the thermal vorticity.We conclude by pointing out that, in spite of the former being larger than thelatter, it is still possible to understand recent results from the STAR BeamEnergy Scan when accounting for the fact that only a portion ofquarks/antiquarks come from the denser and thus thermalized region in thecollision.

Relaxation time for the alignment between the spin of a finite-mass quark/antiquark and the thermal vorticity in relativistic heavy-ion collisions