BSM perspectives on baryon-flavor/charge separation in ultra-relativistic heavy ion collisions

The baryon asymmetry observed in the mid-rapidity region of ultra-relativistic heavy-ion collisions has inspired much discussion as to the associated mechanisms of baryon-number transport. The Standard Model permits baryon number violation, but its mechanism is not expected to operate under the experimental conditions accessible to us. Thus in regard to the possible mechanisms of baryon transport a dichotomy has emerged: is baryon number carried by the baryons' valence quarks or by non-perturbative baryon junctions, made of gluons? Here I discuss possible alternate models of baryon-number-carrying junctions from BSM physics compatible with proton decay constraints, noting existing experimental constraints and how such scenarios might be tested in collisions with nuclei.