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The influence of the underlying nucleon-nucleon collision geometry onevaluations of the nuclear overlap function ($T_{AB}$) and number of binarycollisions ($N_{coll}$) is studied. A narrowing of the spatial distribution ofthe hard-partons with large light-cone fraction $x$ in nucleons leads to adownward correction for $N_{coll}$ and $T_{AB}$, which in turn, results in anupward correction for the nuclear modification factor $R_{AB}$. The size ofthis correction is estimated for several experimentally motivatednucleon-nucleon overlap functions for hard-partons. It is found to besignificant in peripheral nucleus-nucleus and nucleon-nucleus collisions, andare much larger at the LHC energy of $\sqrt{s}=5.5$ TeV than for the RHICenergy of $\sqrt{s}$=200 GeV. The implications for experimental measurementsare also discussed.

physics letters. b

Influence of the nucleon-nucleon collision geometry on the determination  of the nuclear modification factor for nucleon-nucleus and nucleus-nucleus  collisions