Cold-Nuclear-Matter Effects on Heavy-Quark Production in d+Au Collisions at sNN=200GeV

A. Adare et al. (PHENIX Collaboration)
Phys. Rev. Lett. 109, 242301 – Published 12 December 2012

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=200GeV in the transverse-momentum range 0.85pTe8.5GeV/c. In central d+Au collisions, the nuclear modification factor RdA at 1.5<pT<5GeV/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.

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  • Received 6 August 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.242301

© 2012 American Physical Society

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Vol. 109, Iss. 24 — 14 December 2012

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