Predictions on three-particle azimuthal correlations in proton{proton collisions

Abstract

The ridge signal, which is long-ranged in rapidity, in di-hadron correlations in high-multiplicity p{p andp{A collisions opened up a whole new research area in high-energy QCD. Although the ridge had been observed inA{A collisions and interpreted as a result of the radial ow of quark{gluon plasma, it had not appeared until recentlyin the data of small collision systems such as p{p and p{A, nor had it been predicted theoretically or seen in eventgenerators. There are two competing approaches that attempt to explain the systematics of the di-hadron ridge signal:hydrodynamics and gluon saturation physics (color glass condensate/glasma). In this work, we present predictions for thetransverse momentum and rapidity dependence of the three-particle correlation function within gluon saturation physics.Tri-hadron correlations can be measured, and the data can possibly rule out one of the two alternative approaches.