Joe Vanfossen, Jonathan Bouchet, Jaiby Joseph, S. Margetis

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Presentation transcript:

D0 Reconstruction Using Microvertexing Techniques in the STAR Experiment Joe Vanfossen, Jonathan Bouchet, Jaiby Joseph, S. Margetis Kent State University Midwest Critical Mass, October 23, 2010 Physics Motivation STAR Detector Microvertexing Technique (Silicon info+secondary vertex fitting) Reconstruction of D0→K-π+ in Au+Au Collisions at √sNN = 200 GeV

Motivation Heavy flavor quarks are produced early in collisions Provide insights to the properties of the medium created Nuclear form factor RAA→ energy loss in the medium Measurement Indirect using semi leptonic decays [1]: D0→e++X , BR : 6.9 % Direct using topological reconstruction [2]: D0 (D0)K-π+(K+π-)BR : 3.8 % To separate c and b contributions, use full topological reconstruction of decaying particle Challenging because D0 decay length is small cτ(D0)≈124μm [1]Adare A et al. (PHENIX) 2010 (Preprit1005.1627) [2] dAu :Phys. Rev. Lett. 94 (2005) AuAu :STAR arXiv:0805.0364 CuCu : preliminary

STAR Detector Time Projection Chamber (TPC) Silicon Detectors Single Layer Silicon Strip Detector (SSD) 3 Layer Silicon Drift Detector (SVT) System Pointing Resolution of about 280μm in transverse direction [1] [1] Fisyak Y V et al. 2008 J. Phys. Conf. Ser. 119 032017

Secondary Vertex Resolution FIT HELIX Evaluate Resolution in x,y,z Compare Traditional helix swimming reconstruction method to Secondary Vertex Fit Method Helix swimming method struggles more with near parallel tracks and has lower resolution.

Old Silicon Detectors have marginal capabilities but served as a playground for gaining Alignment, Fitting etc experience.

Some physics seems possible

Summary Obtained D0 signal with direct topological reconstruction Ongoing effort: to tune cuts to maximize S/N estimate efficiency corrections (to get pt spectra)