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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: - PowerPoint PPT Presentation
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• The PHENIX experiment
• Role of the Particle Identification at high Pt
• Aerogel Cerenkov detector
• Design
• Test-beam performance
• Outlooks
Extended Pid in PHENIX(BNL, Dubna, Tokyo, Tsukuba)
E.Kistenev
for the PHENIX High Pt Upgrade Project
CIPANP 2003
tracking:
DC,PC1, PC2, PC3
electron Id:
RICH, EMCal, TEC
photons:
EMCal
charged hadron Id:
Aerogel, RICH, TEC, EMCal
PHENIX at RHIC
Extending PHENIX ReachExtending PHENIX Reach
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;G measurement by heavy quark production in wide x
range;– Gluon shadowing in wide x range
Present pT range with PID :/K up to 2 GeV/c p/(+K) up to 4.5 GeV
PHENIX High Pt Upgrade Project
Aerogel detector building blocks
Goal: K-threshold close to 5 GeV/c
Cherenkov emission in Aerogel
• It is Cherenkov Emission.
2
22
2max1
1p
pm
nNN
Light yield vs Momentum Light Yield vs Refractive index
N photonvisible 500sin2 c [1/cm]
c Cos 1(1
n)
Nmax 500 q.e.12 [cm]
1200 p.e.Data from Belle, slide from Ya. Miake
PHENIX Aerogel n=1.012
Aerogel Detector R&D – Test Beam at KEK
Light Yeld Dependence on Aerogel Stack Thickness
• Light Yield saturates at ~ 12 cm depth
• Scattering dominates in light losses
3 GeV/c pions
n = 1.017
R6233(3”,non-UV)
L
scatt 4 , abs 2
Uniformity of the Light YIeld
N=1.014
Light yield and counter orientation
Aerogel
Beam direction
Timing in aerogel detector
-better then the counter size track matching
-background rejection
Subnanosecond resolution measured when timing on first photoelecton
PHENIX PID in Run4 and beyond …
Pion-Kaon
separation
Kaon-Protonseparation
TOF ~100 ps 0 - 2.5 - 5
RICH n=1.00044
th~34
5 - 17 17 -
Aerogel n=1.01
th~8.5
1 - 5 5 - 9
0 4 8
0 4 8
0 4 8 0 4 8
0 4 8
0 4 8