Comparison of the Color Glass Condensate to di-hadron correlations in proton-proton and proton-nucleus collisions

Understand

We perform a detailed comparison of long range rapidity correlations in the Color Glass Condensate framework to high multiplicity di-hadron data in proton-proton and proton-lead collisions from the CMS, ALICE and ATLAS experiments at the LHC.

• The overall good agreement thus far of the non-trivial systematics of theory with data is strongly suggestive of gluon saturation and the presence of subtle quantum interference effects between rapidity separated gluons.
• In particular, the yield of pairs collimated in their relative azimuthal angle $\Delta\phi\sim 0$, is sensitive to the shape of unintegrated gluon distributions in the hadrons that are renormalization group evolved in rapidity from the beam rapidities to those of the measured hadrons.
• We present estimates for the collimated di-hadron yield expected in central deuteron-gold collisions at RHIC.