1 / 5

D 0 Measurements in Au+Au Collisions at √s NN = 200 GeV at STAR using the Silicon Inner Tracker

D 0 Measurements in Au+Au Collisions at √s NN = 200 GeV at STAR using the Silicon Inner Tracker. Sarah LaPointe Wayne State University. For further details see poster 311. D 0 Reconstruction. Full hadronic D 0 reconstruction through identified displaced vertices. Silicon Inner Tracker.

tuyet
Download Presentation

D 0 Measurements in Au+Au Collisions at √s NN = 200 GeV at STAR using the Silicon Inner Tracker

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. D0 Measurements in Au+Au Collisions at √sNN = 200 GeV at STAR using the Silicon Inner Tracker Sarah LaPointe Wayne State University For further details see poster 311

  2. D0 Reconstruction Full hadronic D0 reconstruction through identified displaced vertices. Silicon Inner Tracker • D0 K- + • c = 123 m - Composed of a SVT and SSD SVT 3 barrels w/ 2 coverage between r = 5 and 15 cm SSD 1 layer located at r = 23 cm Detector Performance • Position resolution  ~ 30 m Order of magnitude improvement from TPC alone • Impact parameter = 210 m (pT = 1 GeV/c) f : 15 improvement from TPC alone Quark Matter 2009, Poster 311

  3. + Daughters dca PV Decay Length Dca daughters D0 dca PV PV K- — Pythia D0 — Au+Au Background Geometrical Variable Distributions Studied geometric variables to optimize signal/bkg. • Optimized Cuts • TPC hits ≥ 25 • SVT hits = 3 • D0 dca PV ≤ 300 m • Decay Length ≥ 150 & ≤ 350 m • Dca Daughters ≤ 50 m • Daughter dca PV ≥ 150 & ≤ 300 m Quark Matter 2009, Poster 311

  4. Results Preliminary analysis done using 17M of the 47M run 7 Au+Au events • signal ~ 3000 • signal/bkg = 0.006 • = s/(s+b) = 4.5 D0 Invariant Mass Order of magnitude improvement of signal/bkg with respect to TPC alone analysis STAR Preliminary The estimated D0+D0bar signal for the entire data set ~ 15k Quark Matter 2009, Poster 311

  5. Outlook and Plans • First D0 measurement in heavy ion collisions using displaced vertices • Unambiguous determination of the D- and B- meson contribution to the non-photonic electron spectrum • Projected pT reach of 4 GeV/c Physics • 2optimize analysis based on the purity of the sample • RCP optimize for greater statistics • Cross check with other background subtraction methods • Improve s/b based on further optimization A successful determination of 2 and RCP will not only provide insight of the interaction of charm with the medium but will be a good reference to the results that will come from the HFT in STAR and the VTX in PHENIX For further details see poster 311 Quark Matter 2009, Poster 311

More Related