# Quark Matter 2014 - XXIV International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

19-24 May 2014
darmstadtium
Europe/Zurich timezone

### Email QM2014

## Measurement of single electrons from heavy flavor decays from $p$$+$$p$, $d$$+Au, and Cu+Cu collisions in the PHENIX experiment 19 May 2014, 12:20 20m platinum (darmstadtium) ### platinum #### darmstadtium Schlossgraben 1 64283 Darmstadt Germany Contributed Talk Open Heavy Flavour and Quarkonia ### Speaker Sanghoon Lim (Yonsei University) ### Description Charm and bottom quarks are formed predominantly by gluon fusion in the initial hard scatterings at RHIC, making them good probes of the full medium evolution. Previous measurements at RHIC have shown large suppression and azimuthal anisotopy of open heavy flavor hadrons in Au+Au collisions at \sqrt{s_{NN}} = 200 GeV. Explaining the simultaneously large suppression and flow of heavy quarks has been a challenge for the community. To further understand the heavy flavor transport in the hot medium, it is imperative to also measure cold nuclear matter effects which affect the initial distribution of heavy quarks as well as the system size dependence of the final state suppression. In this talk, new measurements by the PHENIX collaboration of single electrons from heavy flavor decays in p$$+$$p, d$$+$Au, and Cu$+$Cu collisions at $\sqrt{s_{NN}} = 200$ GeV are presented. In particular, surprising enhancement of intermediate transverse momentum heavy flavor leptons in d$+$Au at mid and backward rapidity are seen to grow going to mid-central Cu$+$Cu collisions. This enhancement is much larger than anti-shadowing of the parton distributions and is theoretically unexplained.
On behalf of collaboration: PHENIX

### Primary author

Sanghoon Lim (Yonsei University)

 Slides