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The PHENIX experiment has measured open heavy-flavor production viasemileptonic decay muons over the transverse momentum range 1 < pT < 6 GeV/c atforward and backward rapidity (1.4 < |y| < 2.0) in d+Au and p+p collisions at?sNN = 200 GeV. In central d+Au collisions an enhancement (suppression) ofheavy-flavor muon production is observed at backward (forward) rapidityrelative to the yield in p+p collisions scaled by the number of binarycollisions. Modification of the gluon density distribution in the Au nucleuscontributes in terms of anti-shadowing enhancement and shadowing suppression;however, the enhancement seen at backward rapidity exceeds expectations fromthis effect alone. These results, implying an important role for additionalcold nuclear matter effects, serves as a key baseline for heavy-quarkmeasurements in A+A collisions and in constraining the magnitude of charmoniabreakup effects at the Relativistic Heavy Ion Collider and the Large HadronCollider.

Cold-nuclear-matter effects on heavy-quark production at forward and backward rapidity in d+Au collisions at sqrt(s_NN)=200 GeV