# Quark Matter 2012

12-18 August 2012
US/Eastern timezone

## Identification of charmed particles using multivariate analysis in STAR experiment

16 Aug 2012, 16:00
2h

Poster Heavy flavor and quarkonium production

### Speakers

Jonathan Bouchet (Kent State University) Joseph Vanfossen (Kent State University)

### Description

Heavy flavor particles, due to their production at the early stages of a collision, are of interest to study the properties of the matter created in heavy ion collisions at RHIC. Previous measurements of $D$ and $B$ mesons at RHIC[1, 2] using semi-leptonic probes show a suppression similar to that of light quarks, which is in contradiction with theoretical models including only a gluon radiative energy loss mechanism[3]. A direct topological reconstruction is needed to obtain a precise measurement of hadronic charmed meson decays. The remaining combinatorial background can be reduced by using modern multivariate techniques (TMVA)[4] that makes optimal use of all the information available. Comparison with classical methods and recent results[5] as well as the performances of some classifiers will be presented for the reconstruction of $D^{0}$ decay vertex ($D^{0} \rightarrow K^{-}\pi^{+}$) and its charge conjugate from Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV produced in 2007 using the Silicon Vertex Tracker and Silicon Strip Detector. \newline \newline [1]Adare A. et al., PHENIX Collaboration, Phys. Rev. C 84, 044905, 2011\newline [2]B.I. Abelev et al., STAR Collaboration, Phys. Rev. Lett 106, 159902, 2011\newline [3Y. L. Dokshitzer, D. E. Kharzeev, Phys. Lett. B 519, 2001\newline [4]A. Hoecker et al., arXiv:physics/0703039v5\newline [5]B. I. Abelev, et al, STAR Coll., arXiv:0805.0364\newline

### Primary author

Joseph Vanfossen (Kent State University)

### Co-authors

Jonathan Bouchet (Kent State University) Prof. Spyridon Margetis (Kent State University)

### Presentation Materials

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