# 11th international workshop on High-pT Physics in the RHIC & LHC Era

12-15 April 2016
BNL Physics Building
US/Eastern timezone

## Recent heavy flavor measurements at PHENIX at RHIC

13 Apr 2016, 16:00
30m
Large Seminar Room (BNL Physics Building)

### Speaker

Dr Xuan Li (Los Alamos National Laboratory)

### Description

Heavy flavor and quarkonium production are important hard probes to test Quantum Chromodynamics (QCD) and measure the properties of the Quark Gluon Plasma (QGP) created in high energy heavy ion collisions. After the installation of the Forward Silicon Vertex Tracker (FVTX) in 2012, the PHENIX experiment collected large data sets of p+p, p+Al, p+Au, Cu+Au and Au+Au collisions. The FVTX dramatically improves the tracking quality in the rapidity range of 1.2$<|y|<$2.2, with full azimuthal angle coverage. When combined with the barrel silicon vertex detector, decayed particles with a non-zero displaced vertex can be identified. This tracking upgrade provides opportunities to study cold nuclear effects especially in asymmetric nuclear interactions, heavy quark energy loss in cold nuclear medium and hot QGP, and separation of the cold nuclear effects from the hot QCD effects (eg. QGP) in heavy ion collisions. In this talk, preliminary results of the $J/\psi$ to $\psi'$ ratio from 200 GeV p+p, p+Al and p+Au data will be discussed. We will also present the current status of the extraction of non-prompt $J/\psi$ from B meson decay relative to the prompt $J/\psi$ production in Cu+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and p+p collisions at $\sqrt{s_{NN}}$ = 510 GeV. This analysis uses the Distance of Closest Approach (DCA) of decay muons from $J/\psi$ to the event vertex. Similar methods can be applied in other data sets and to the study of B- and D-meson semi-leptonic decays to muons. We will show the prospects for these forward and backward rapidity measurements in (asymmetric) heavy ion and p+p collisions.

### Primary author

Dr Xuan Li (Los Alamos National Laboratory)

 Slides