12-18 August 2012
US/Eastern timezone

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Identification of charmed particles using multivariate analysis in STAR experiment

16 Aug 2012, 16:00
2h
Regency 1/3 and Ambassador ()

Regency 1/3 and Ambassador

Poster Heavy flavor and quarkonium production Poster Session Reception

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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