Modern nuclear PDF sets can explain most of the forward di-hadron and di-jet suppression in p+A collisions without invoking gluon saturation, and naturally predict an unchanged azimuthal width.
Dihadron momentum imbalance and correlations in d+Au collisions
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abstract
We calculate in perturbative QCD the transverse momentum imbalance of dijet and dihadron production in high energy p+A (d+A) collisions. We evaluate the effect of both initial- and final-state multiple scattering, which determines the strength of this transverse momentum imbalance. Combining this new result with the suppression of the cross section in d+Au collisions, which arises from cold nuclear matter energy loss and coherent power corrections, we are able to describe the dihadron correlations measured by both PHENIX and STAR collaborations at RHIC, including mid-mid, mid-forward, and forward-forward rapidity hadron pairs.
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Description of di-hadron saturation signals within a universal nuclear parton distribution function approach
Modern nuclear PDF sets can explain most of the forward di-hadron and di-jet suppression in p+A collisions without invoking gluon saturation, and naturally predict an unchanged azimuthal width.