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STAR Detector Event selection and triggers Corrections to data

Published byKurt Mogensen Modified over 5 years ago

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Presentation on theme: "STAR Detector Event selection and triggers Corrections to data"— Presentation transcript:

1 STAR Detector Event selection and triggers Corrections to data Negative Hadron Spectra Conclusions and Outlook

2 STAR Geometry Time Projection Chamber 2 m ZDC ZDC 4 m
Magnet Time Projection Chamber Coils Silicon Vertex Tracker TPC Endcap & MWPC 2 m FTPCs ZDC ZDC Vertex Position Detectors Endcap Calorimeter 4 m Central Trigger Barrel Barrel EM Calorimeter RICH DNP Meeting October 7, 2000

3 Minimum Bias Trigger ZDC Trigger All RHIC experiments Luminosity
5% Most Central Region ~30K Events |Zvtx| < 200 cm ZDC Trigger All RHIC experiments Luminosity Centrality CTB Trigger Multiplicity DNP Meeting October 7, 2000

4 Corrections For h- Distributions
Magnitudes for Medium Multiplicity at  =0 Efficiency ~88%, pT> 0.2 GeV/c Acceptance ~95%, pT> 0.4 GeV/c Decay/secondary Backgrounds ~7%, pT > 0.6 GeV/c Electron background <2%, pT > 0.4 GeV/c Resolution <2 %, pT>0.1 Merging (<1%) Splitting (<½ %) Ghost Tracks less ~ 1 ‰ DNP Meeting October 7, 2000

5 h- Multiplicity Distribution
DNP Meeting October 7, 2000

6 h-  Distribution DNP Meeting October 7, 2000

7 h- pT Distribution DNP Meeting October 7, 2000

8 - pT Distribution DNP Meeting October 7, 2000

9 Conclusions _ First measured absolutely normalized h- distribution @
Working towards dN/dpTdy spectra for ’s, k’s and protons DNP Meeting October 7, 2000

10 pT Power Law Fit STAR <pT> ~ 0.5 GeV/c DNP Meeting
October 7, 2000

11 pT Comparisons DNP Meeting October 7, 2000

12 TPC Performance All hits and tracks: - red = low pT - violet = high pT
Hit Position residuals cosmic data ~ 500 mm DNP Meeting October 7, 2000

13 Simulated tracks Embedded into
Momentum Resolution Simulated tracks Embedded into Real events Resolution from Cosmic Data DNP Meeting October 7, 2000

14 dE/dx Particle Id K p d  e Resolution approaching ~8% (Design)
DNP Meeting October 7, 2000

15 Raw and Corrected pT DNP Meeting October 7, 2000

16 Raw and Corrected  DNP Meeting October 7, 2000

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