Abstract
The PHENIX experiment has measured electrons and positrons at midrapidity from the decays of hadrons containing charm and bottom quarks produced in d+Au and p+p collisions at √sNN=200  GeV in the transverse-momentum range 0.85≤peT≤8.5  GeV/c. In central d+Au collisions, the nuclear modification factor RdA at 1.5<pT<5  GeV/c displays evidence of enhancement of these electrons, relative to those produced in p+p collisions, and shows that the mass-dependent Cronin enhancement observed at the Relativistic Heavy Ion Collider extends to the heavy D meson family. A comparison with the neutral-pion data suggests that the difference in cold-nuclear-matter effects on light- and heavy-flavor mesons could contribute to the observed differences between the π0 and heavy-flavor-electron nuclear modification factors RAA.
