Is this “standard” nuclear shadowing ?

• Take the predictions of your favourite leading-twist approach ...

• Maximum gluon shadowing at x~10-4 (indirectly) constrained by available DIS data on nuclear targets is ~0.8

• IF indeed RdAu(pT~2 GeV/c) ≈ 0.5 º RG(x=10-4) ≈ 0.5 this could be an evidence of extra higher-twist effects at small-x (breakdown of QCD factorization). [BUT, soft physics effects can still be playing a role here ...]