Post on 29-Mar-2015
Silicon Verterx Tracker UpgradeSilicon Verterx Tracker Upgradeof of
PHENIX Experiment at RHICPHENIX Experiment at RHIC
Y. Akiba (RIKEN)
CIPANP2003New York, New York
May 2003
West Arm tracking:
DC,PC1, PC2, PC3 electron ID:
RICH, EMCal
photons:EMCal
East Arm tracking:
DC, PC1, TEC, PC3 electron & hadron ID:
RICH,TEC/TRD, TOF, EMCal
photons:EMCal
PHENIX Setup Completed in 2003 PHENIX Setup Completed in 2003
South & North Arm tracking:
MuTr muon ID:
MuID
Other Detectors Vertex & centrality:
ZDC, BBC,MVD
Beyond Baseline TRD upgrade FCAL
Physics Beyond Reach of Current PHENIX Physics Beyond Reach of Current PHENIX
Detailed study of Heavy Quark production 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
Measurements complement and enhance the present physics program• fully exploit existing rare event capabilities of PHENIX• PHENIX central and muon spectrometer are essential
Provide key measurements so far inaccessible at PHENIX:
Open Charm and BeautyOpen Charm and Beauty Physics interest in charm and beauty in Heavy Ion Collisions
Do heavy quarks lose energy in quark matter? charm can be produced thermally charm enhancement critical base line for J/ and Y production & dilepton continuum
Spin Physics with charm/beauty Gluon polarization in wide
PHENIX measured charm via inclusive electron (PRL88 (2002) 192303) Indirect measurement can not distinguish charm and beauty for pT > 4 GeV/c
beauty
charm
Charm and beauty separation aim of future PHENIX program
Detection of decay vertexwill allow a clean identifications of charm and bottom decays
m cGeV m
D0 1865 125 D± 1869 317
B0 5279 464 B± 5279 496
Need secondary vertex resolution < 50 m
Beauty and high pT charm will require high luminosity
Direct Observation of Open Charm and BeautyDirect Observation of Open Charm and Beauty
Detection options:• Beauty and low pT charm through displaced e and/or • Beauty via displaced J/• High pT charm through D K
Au
e
D
AuD
X
J/B
XK
Central arm& barrel SVT
muon arm& end cap SVT
Pixel barrels (50 m x 425 m)Strip barrels (80 m x 3 cm)Pixel disks (50 m x 2 mm)
~1.0% X0 per layerbarrel resolution < 50 m forward resolution < 150 m
1.2<||<2.4||<1.2
Silicon Vertex Tracker in PHENIXSilicon Vertex Tracker in PHENIX
Strawman design under investigation
Charm/Beauty measurements with the barrel SVTCharm/Beauty measurements with the barrel SVT
b e by barrel+central arm
c
HIJING Au+Au
In Au+Au Robust charm measurement at
low pt Beauty measurement Direct charm measurement at
high pt Clear c/b separation Energy loss of charm at high pt
Direct measurement of charmed hadron with central arm + barrel
c e by barrel+central arm
Single muons associated with end-cap
Charm/beauty measurement with SVT end-capCharm/beauty measurement with SVT end-cap
Without SVT, most muons are from decay of , K
After muon tracks are associated with the endcap SVT, muon spectrum is dominated by charm decay
z vertex (cm)
direct J/
J/ from B
Beauty J/in endcap + muon arm
B decays to J/ with about 1% branching ratio
With the end-cap SVT, direct J/ and J/ from B decay can be clearly separated.
Spin Physics with SVT UpgradeSpin Physics with SVT Upgrade
Measurement of Gluon polarization by Heavy flavor production c, b e, + displaced vertex B displaced J/ DKat high pt
SVT measurement of displaced vertex Improved S/B higher sensitivity to G(x) Much broader x-range coverage
SVT significantly increases the x converage of G(x) measurement
Measurement of gluon shadowing with SVTMeasurement of gluon shadowing with SVT
Heavy-flavor measurement in p+A Single lepton and J/ with displaced vertex
Heavy-flavor production via g+g q+q Extracting gluon structure function nuclei, shadowing
vertex detector provides broader range in x into predicted shadowing region (x ~ 10-2 - 10-3)
Silicon Vertex Tracker R&DSilicon Vertex Tracker R&D
Ongoing R&D Silicon strip sensor development Hybrid pixels (with ALICE and NA60) design of support structure
Critical contributions supported by R&D proposal silicon strip readout & integration into PHENIX hybrid pixel integration, thinning & bump bonding development of monolithic active pixel sensors design of support structure including cooling etc
Participating institutions BNL, ISU, Kyoto U., LANL, ORNL, RIKEN, Stony Brook U.
Hit map
x x
uu
strip sensor design Z.li, BNL
strip sensor test RIKEN
NA60 hybrid pixel tests (RIKEN,SB)
Silicon Vertex Tracker R&DSilicon Vertex Tracker R&D
Beam test at KEK by RIKEN/Kyoto
=52 =35 =45 =35 =49
Source test at RIKEN
YearFY03 FY04 FY05 FY06 FY07 FY08 FY09
Silicon barrelforward silicon
DAQ/Trigger
R&D
constructionSilicon barrel
forward siliconDAQ/Trigger
Upgrade
Physics
Program
Heavy flavorEnhanced G/Gp-nucleus program
Time Line for PHENIX UpgradesTime Line for PHENIX Upgrades
SummarySummary Goal:
Detailed study of Heavy Quark production in pp, pA (dA), and AA collisions at RHIC
Physics with SVTX upgrade Au+Au
Energy loss of charm at high ptBeauty production
Polarized p+pG(x) measurement in wide x range (polarized proton)
p+A (d+A)Gluon shadowing in wide x range
Proposed Sillicon vertex detector Si barrel (1 pixel + 3 strips) Si end cap
R&D