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Study of Charged Hadron Azimuthal Correlations at PHENIX Experiment

This work focuses on analyzing azimuthal correlations of charged hadrons at PHENIX Experiment using data from Au-Au collisions at 200 GeV. Motivated by elliptic flow, the study aims to measure high-pT p0 particles and extract the v2 flow parameter. The study involves correlation functions, reaction plane motivation, quark coalescence, and correlation function extraction methods. Detector setup, extraction of v2, and corrections for p0 v2 are discussed, with ongoing work addressing error bars and future plans for improved analysis.

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Study of Charged Hadron Azimuthal Correlations at PHENIX Experiment

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  1. p0-Charged Hadron Azimuthal Correlations Nathan Grau Iowa State University For the PHENIX Collaboration

  2. Outline • Motivations for two particle correlation functions: azimuthal anisotropy (elliptic flow) • Analysis from the PHENIX experiment from Au-Au at = 200 GeV • Use PHENIX capability to measure high-pT p0 and extract the v2 flow parameter

  3. Reaction plane Motivation - Azimuthal Anisotropy / Elliptic Flow Pressure gradient • Non-central collisions pressure gradient • Particles correlated with reaction plane Molnar & Voloshin, nucl-th/0302014 v2 = <cos(2f)> • Quark Coalescence – large saturated v2 • meson & baryon flow differs

  4. Correlation Functions and v2 Extraction • Numerator: pairs within event. • Denominator: pairs within different events. • Detector efficiencies and acceptance cancels. The Correlation Function for two-particle correlations is given as: • Need h+/- - h+/- Correlation Function in a reference pT bin

  5. PHENIX Experiment • Drift Chamber (DC) and Pad Chamber 1 (PC1) for tracking • RICH rejects e+,e- • EMCal (PbSc, PbGl) for high-pT g's reconstruct p0’s

  6. Extracting v2 • Candidate p0 – all g pairs under peak • Background = Combinatoric g pairs in mass • Bin mass towards background v2 estimate Mgg

  7. Correcting the p0 v2 To measure p0 v2: • v2meausred extracted in mass • Measure v2 outside p0 mass bins. • v2B obtained from a linear fit with the v2 outside p0 mass bins.

  8. Corrected p0 v2 Work in Progress • v2 rises to and saturates at 0.15 for pT > 3 GeV • Large error bars due to extrapolation of the v2B as well as the B/S. Min Bias

  9. Summary • Presented work in progress on p0-h+/- correlations from = 200 GeV Au-Au at the PHENIX experiment. • Presented initial correction to the p0 v2. • Future work: Good PID for high-pTp0, have v2 for p-p, d-Au, and next Au-Au run.

  10. Extracting v2B Point extracted from linear fit to the data points outside p0 mass. Error bars calculated by the extreme v2Bvalues of the data points. V2B V2B 1.5<pT<2.0 GeV 2.0<pT<2.5 GeV Mgg Mgg

  11. p0 Corrected v2 & Reaction Plane v2 V2 v2 pion kaon proton Min Bias: 0-90% Negatives h-,pi-,K-,pbar Positives h+,pi+,K+,p PHENIX Preliminary PHENIX Preliminary pT (GeV/c) pT (GeV/c)

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