Download - 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
RRelativistic elativistic HHeavy eavy IIon on CCollider (ollider (RHICRHIC))
PPioneering ioneering HHigh igh EEnergy nergy NNuclear uclear IInteraction enteraction eXXperiment (periment (PHENIXPHENIX))
ID-hadrons, Muons, Electrons, Photons
High Rate Capability. Rare Processes.
Aerogel Cherenkov Detector• Modules for half sector are installed in 2003• Enhancement of PID capability at PHENIX
– Proton separation from /K up to p = 7 GeV/c
chargedtrack
160 segments
z (beam
) dire
ction
Azim
uthal angle
Half of th
em in
2003
Reflector (Goretex) PMT
(3 inch)
Aerogel (index~1.011) ( 11x22x20
cm3 )
Integration Cube (Air)PMT(3 inch)
JET Quenching
Modification of Jet property in AA collisions because partons propagating in colored matter lose energy.
One of the possible observableTp
Was predicted in a lot of works. Some of them (not all) are:
1
0)(Pd
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
The suppression of the high- hadrons In AA collisions
Jet: A localized collection of
hadrons which come from a fragmenting parton
First data in first RHIC RUN
Jet Quenching ! Great!
For more observables see the next slides
Initial state effects (test experiment d+Au)
Suppression in central Au+Au due to final-state effects
/h
Au+Au @ sNN
= 200 GeV d+Au @ sNN
= 200 GeV
preliminary
Au+Au @ sNN
= 200 GeV d+Au @ sNN
= 200 GeV
preliminary
Au+Au @ sNN
= 200 GeV d+Au @ sNN
= 200 GeV
preliminary
Au+Au @ sNN
= 200 GeV d+Au @ sNN
= 200 GeV
preliminary
Again Au+Au and d+Au
If there are any other observables for Jet Quenching?
Correlation of trigger particles 4<pT<6.5 GeV withassociated particles 2<pT<pT,trig
Associated particles
Near side jetTrigger particle
Away side jet
Yes! Back to Back Jets correlation.
Kirill Filimonov, QM’04
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).
Backup slides
Nuclear modification factor
is what we get divided by what we expect.is what we get divided by what we expect.
NN
biaryAAAA d
N/dR
From naive picture
AAR
1
0 d
*d
z
z)(Pd (...)f b/B(...)f a/A
(...)f b/B(...)f a/A
)Q,z(D 2d
*dd/h
)Q,z(D 2d
*dd/h
cdabd
cdabd
AAR
Suppression of high-pt hadrons. Qualitatively.
Jet tomography
20-60%
STAR Preliminry
20-60%
pTtrig=4.0-6.0 GeV/c, ||<1.02.0<pTassoc<pTtrig
Back-to-back suppression depends on the reaction plane orientation:
In-plane
Out-plane
Jet-pair Distributions
(deg.)0 20 40 60 80 100 120 140 160 180
<nab>
/<n a
><
n b>
0.000
0.002
0.004
0.006
Au+Au s 200 GeVCentrality 20 - 40 %
PHENIX Preliminary
color scheme:
pTtrig=2.5-4.0 GeV/c, ||<0.35
1.0<pTassoc<2.5 GeV/c
in-plane out-of-plane
energy loss dependence on the path length!
Kirill Filimonov, QM’04