Abstract
The PHENIX experiment has measured electrons and positrons at midrapidity from the decays of hadrons containing charm and bottom quarks produced in and collisions at in the transverse-momentum range . In central collisions, the nuclear modification factor at displays evidence of enhancement of these electrons, relative to those produced in collisions, and shows that the mass-dependent Cronin enhancement observed at the Relativistic Heavy Ion Collider extends to the heavy 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 and heavy-flavor-electron nuclear modification factors .
- Received 6 August 2012
DOI:https://doi.org/10.1103/PhysRevLett.109.242301
© 2012 American Physical Society