High-pT Pion Quenching versus anti+Baryon Enhancement in Nucleus-Nucleus Collisions
Ivan Vitev, Miklos Gyulassy
Abstract
Jet quenching of quarks and gluons in central A+A collisions suppresses the high-pT meson production and exposes novel baryon dynamics that we attribute to (gluonic) baryon junctions. This mechanism predicts baryon enhancement in a finite moderate-pT window that decreases with increasing impact parameter. We also extend recent calculations of the transverse momentum behavior of p/pi+ and p-bar/pi- to other baryon species and show that a similar pattern is expected for the K-/Lambda and K+/barLambda ratios. Within the framework of the model constant p-bar/p and barLambda/Lambda ratios are found in central Au+Au collisions at RHIC energies up to pT ~= 4 - 5 GeV.
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