Abstract
Dihadron angular correlations in forward pA collisions have been considered as one of the most sensitive observables to the gluon saturation effects. In general, both parton shower effects and saturation effects are responsible for the back-to-back dihadron angular de-correlations. With the recent progress in the saturation formalism, we can incorporate the parton shower effect by adding the corresponding Sudakov factor in the saturation framework. In this paper, we carry out the first detailed numerical study in this regard, and find a very good agreement with previous RHIC pp and dAu data. This study can help us to establish a baseline in pp collisions which contains little saturation effects, and further make predictions for dihadron angular correlations in pAu collisions, which will allow to search for the signal of parton saturation.
Highlights
Small-x physics framework provides with the description of dense parton densities at high energy limit, when the longitudinal momentum fraction x of partons with respect to parent hadron is small
Dihadron angular decorrelation in forward rapidity pp and d Au (p A) collisions, which was first proposed in Ref. [6], is reckoned as one of the most interesting observables sensitive to gluon saturation effects
Saturation effect in forward p Au collisions can be factorized into various small-x unintegrated gluon distributions (UGDs) as derived in Refs. [8,9]
Summary
Small-x physics framework provides with the description of dense parton densities at high energy limit, when the longitudinal momentum fraction x of partons with respect to parent hadron is small. By applying the small-x improved TMD factorization framework [16], the suppression of the forward dijet angular correlations in proton-lead versus proton–proton collisions at the LHC due to saturation effects has been predicted in Ref. We can perform a much more comprehensive and quantitative comparison between the small-x calculation and experimental data Both saturation and Sudakov effect should play important roles in dihadron (dijet) angular correlation (decorrelation) in p Au collisions. Saturation effect in forward p Au collisions can be factorized into various small-x unintegrated gluon distributions (UGDs) as derived in Refs.
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