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The PHENIX experiment Role of the Particle Identification at high Pt Aerogel Cerenkov detector

E.Kistenev for the PHENIX High Pt Upgrade Project. Extended Pid in PHENIX (BNL, Dubna, Tokyo, Tsukuba). The PHENIX experiment Role of the Particle Identification at high Pt Aerogel Cerenkov detector Design Test-beam performance Outlooks. CIPANP 2003. PHENIX at RHIC. tracking:

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The PHENIX experiment Role of the Particle Identification at high Pt Aerogel Cerenkov detector

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  1. E.Kistenev for the PHENIX High Pt Upgrade Project Extended Pid in PHENIX (BNL, Dubna, Tokyo, Tsukuba) • The PHENIX experiment • Role of the Particle Identification at high Pt • Aerogel Cerenkov detector • Design • Test-beam performance • Outlooks CIPANP 2003

  2. PHENIX at RHIC • tracking: • DC,PC1, PC2, PC3 • electron Id: • RICH, EMCal, TEC • photons: • EMCal • charged hadron Id: • Aerogel, RICH, TEC, EMCal

  3. Extending PHENIX Reach • Present pT range with PID : • p/K up to 2 GeV/c • p/(p+K) up to 4.5 GeV • Extending Pid to 10 GeV/c will enhance • Jet tagging – initial vs final state partonic evolution; • Charm & beauty measurement in Au+Au collisions -> energy loss of charm/beauty in hot matter; • - DG measurement by heavy quark production in wide x range; • Gluon shadowing in wide x range

  4. PHENIX High Pt Upgrade Project

  5. Aerogel detector building blocks Goal: K-threshold close to 5 GeV/c

  6. Cherenkov emission in Aerogel Light yield vs Momentum Light Yield vs Refractive index PHENIX Aerogel n=1.012 • It is Cherenkov Emission. Data from Belle, slide from Ya. Miake

  7. Aerogel Detector R&D – Test Beam at KEK

  8. Light Yeld Dependence on Aerogel Stack Thickness n = 1.017 L R6233 (3”,non-UV) 3 GeV/c pions • Light Yield saturates at ~ 12 cm depth • Scattering dominates in light losses

  9. Uniformity of the Light YIeld N=1.014

  10. Light yield and counter orientation Aerogel Beam direction

  11. Timing in aerogel detector Subnanosecond resolution measured when timing on first photoelecton • better then the counter size track matching • background rejection

  12. 0 0 0 0 0 0 4 4 4 4 4 4 8 8 8 8 8 8 PHENIX PID in Run4 and beyond …

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