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The aerogel detector for PHENIX experiment was constructed with Dubna Group participation on all

The aerogel detector for PHENIX experiment was constructed with Dubna Group participation on all stage of this project. Purpose:. Obtain additional information about Jet Quenching effect. R elativistic H eavy I on C ollider ( RHIC ).

maya-saunders
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The aerogel detector for PHENIX experiment was constructed with Dubna Group participation on all

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  1. The aerogel detector for PHENIX experiment was constructed with Dubna Group participation on all stage of this project. Purpose: Obtain additional information about Jet Quenching effect

  2. Relativistic Heavy Ion Collider (RHIC)

  3. Pioneering High Energy Nuclear Interaction eXperiment (PHENIX) ID-hadrons, Muons, Electrons, Photons High Rate Capability. Rare Processes.

  4. PMT (3 inch) Integration Cube (Air) Reflector (Goretex) PMT (3 inch) Aerogel (index~1.011) （11x22x20 cm3） 160 segments Azimuthal angle Half of them in 2003 z (beam) direction charged track Aerogel Cherenkov Detector • Modules for half sector are installed in 2003 • Enhancement of PID capability at PHENIX • Proton separation from p/K up to p = 7 GeV/c

  5. JET Quenching Jet: A localized collection of hadrons which come from a fragmenting parton Modification of Jet property in AA collisions because partons propagating in colored matter lose energy. One of the possible observable The suppression of the high- hadrons In AA collisions Was predicted in a lot of works. Some of them (not all) are: • J.D.Bjorken (1982), Fermilab – PUB – 82 – 059 - THY. • M.Gyulassy and M.Palmer, Phys.Lett.,B243,432,1990. • X.-N.Wang, M.Gyulassy and M.Palmer, Phys.Rev.,D51,3436,1995. • R.Baier et al., Phys.Lett.,B243,432,1997. • R.Baier et al., Nucl.Phys.,A661,205,1999

  6. First data in first RHIC RUN Jet Quenching ! Great! For more observables see the next slides

  7. Initial state effects (test experiment d+Au) Suppression in central Au+Au due to final-state effects

  8. Au+Au @ sNN = 200 GeV Au+Au @ sNN = 200 GeV Au+Au @ sNN = 200 GeV Au+Au @ sNN = 200 GeV d+Au @ sNN = 200 GeV d+Au @ sNN = 200 GeV d+Au @ sNN = 200 GeV d+Au @ sNN = 200 GeV preliminary preliminary preliminary preliminary Again Au+Au and d+Au

  9. Trigger particle Near side jet  Away side jet If there are any other observables for Jet Quenching? Yes! Back to Back Jets correlation. Associated particles Correlation of trigger particles 4<pT<6.5 GeV withassociated particles 2<pT<pT,trig Kirill Filimonov, QM’04

  10. Hadron meson puzzle (no suppression for protons?) The aerogel detector is proposed for study identified particle at High pt and it was correct solution (1991).

  11. Backup slides

  12. Suppression of high-pt hadrons. Qualitatively. Nuclear modification factor From naive picture is what we get divided by what we expect.

  13. pTtrig=2.5-4.0 GeV/c, ||<0.35 1.0<pTassoc<2.5 GeV/c STAR Preliminry color scheme: 20-60% 20-60% Jet tomography pTtrig=4.0-6.0 GeV/c, ||<1.0 2.0<pTassoc<pTtrig in-planeout-of-plane Out-plane Kirill Filimonov, QM’04 Back-to-back suppression depends on the reaction plane orientation: In-plane energy loss dependence on the path length!

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