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