Experimental overview on baryon transport in high-energy nuclear collisions

Baryon transport, sometimes called baryon stopping, describes an excess of baryons compared to antibaryons even at mid-rapidity. Since baryon number is strictly conserved, this net-baryon excess must come from the colliding target and projectile. Conventionally, baryon number is thought to be divided evenly among the three valence quarks of baryonic matter. However, models that use this conventional picture have difficulty reproducing the significant baryon transport that has been measured in hadronic collisions for almost fifty years. An alternative model is the baryon junction: a Y-shaped configuration of nonperturbative gluons that is connected to all three valence quarks and carries the baryon number. This talk will give an overview of baryon transport results from both RHIC and the LHC, including net-proton and net-hyperon yields in heavy ion collisions for a wide range of collision energies, comparisons of charge stopping to baryon stopping in isobar collisions, and the net-proton yield in semi-inclusive photonuclear collisions.