Nu Xu 1/15STAR Regional Meeting, ShanDong University, Jinan, , 22 – 23, October, 2010

STAR Physics Program

- Spin Structure of Proton- Properties of QCD Matter at Extreme Conditions

- QCD Phase Structure Nu Xu

(1) Nuclear Science Division, Lawrence Berkeley National Laboratory Berkeley, USA (2) College of Physical Science and Technology, Central China Normal University Wuhan, China

Nu Xu 2/15STAR Regional Meeting, ShanDong University, Jinan, , 22 – 23, October, 2010

STAR Experiment

STAR Experiment at RHIC( http://www.star.bnl.gov/ )

Fundamental science: particle physics, nuclear physics, astrophysics, cosmology, …

State of art technology: detector R&D, simulations, IT, computing, mass/fast data managing, …

- 550 scientists- 55 institutes- 13 countries- 130 PhD thesis since 2001

Nu Xu 3/15STAR Regional Meeting, ShanDong University, Jinan, , 22 – 23, October, 2010

STAR Physics Focus

Polarized p+p program - Study proton intrinsic properties

Forward program - Study low-x properties, initial condition,

search for CGC - Study elastic and inelastic processes in

pp2pp

1) At 200 GeV top energy - Study medium properties, EoS - pQCD in hot and dense medium

2) RHIC beam energy scan (BES) - Search for the QCD critical point - Chiral symmetry restoration

Nu Xu 4/15STAR Regional Meeting, ShanDong University, Jinan, , 22 – 23, October, 2010

BNL PAC, 21 - 22, 2010

HFT 2013

TPC

FGT 2011

STAR Detectors Fast and Full azimuthal particle identification

EMC+EEMC+FMS(-1 ≤ ≤ 4)TOF

DAQ1000

MTD 2013

Nu Xu 5/15STAR Regional Meeting, ShanDong University, Jinan, , 22 – 23, October, 2010

Particle Identification at STAR

STAR TPC

STAR ToF

STAR EMC

STAR HFT

Neutral particles Strange Jets Heavy Quark hyperons Hadrons

Multiple-fold correlations among the identified particles!

e, μ

πK p d

TPC ToF TPC

Log10(p)STAR MTD

Nu Xu 6/15STAR Regional Meeting, ShanDong University, Jinan, , 22 – 23, October, 2010

TOF Performance (2010)

√sNN = 39 GeV Au + Au CollisionsTPC TPC+ToF

Beam Energy Timing Resolution Remarks

200 (GeV) 85 (ps) At 39 GeV, using a new calibration scheme without information of start time from VPD, 87 ps of timing resolution has been achieved.

62.4 (GeV) 90 (ps)

39 (GeV) 85 (ps)

11.5 & 7.7 (GeV) ~ 80 (ps)

Nu Xu 7/15STAR Regional Meeting, ShanDong University, Jinan, , 22 – 23, October, 2010

STAR Upgrade Timeline*

*Upgrades - Funding driven schedules

Upgrade Completion Key Physics Measurements

FMS Completed 2008 (a) Trans. Asymmetry at forward-y(b) CGC

TPC DAQ1000 Completed 2009 Minimal dead time, large data set

MRPC TOF Completed 2010 Fast PID in full azimuthal acceptance

Forward GEM Tracker

Summer 2011Ready for Run 12

Forward-y W± for flavor separated quark polarization

Heavy Flavor Tracker Summer 2013Ready for Run 14

(a) Precision hadronic ID for charm and Bottom hadrons

(b) Charm and Bottom hadron energy loss and flow

Muon Telescope Detector

Summer 2013Ready for Run 14

(a) High pT muon trigger(b) Quarkonia states

pp2pp’ Summer 2014Ready for Run 15

Nu Xu 8/15STAR Regional Meeting, ShanDong University, Jinan, , 22 – 23, October, 2010

Forward GEM Tracker (2011)

FGTHFT

1) FGT: RHIC CE project2) Six light-weight triple-GEM disks3) New mechanical support structure4) Planned installation: Summer 2011

1) Full charge-sign discrimination at high-pT

2) Design polarization performance of 70% to collect at least 300pb-1

Nu Xu 9/15STAR Regional Meeting, ShanDong University, Jinan, , 22 – 23, October, 2010

Magnet

Return Iron

Solenoid

SSD

IST

PXL

EAST

WEST

HFT

Heavy Flavor Tracker (2014)

FGT

1) Identify heavy flavor hadron directly2) Precision measurement HF hadron

energy loss and collectivity

Nu Xu 10/15STAR Regional Meeting, ShanDong University, Jinan, , 22 – 23, October, 2010

HFT: Charm Hadron v2 and RAA

- 200 GeV Au+Au m.b. collisions (500M events). - Charm hadron collectivity drag/diffusion constants

- Medium properties! - Light quark thermalization!

- 200 GeV Au+Au m.b. collisions (|y|<0.5 500M events)- Charm hadron RAA

- Energy loss mechanism! - QCD in dense medium!

Nu Xu 11/15STAR Regional Meeting, ShanDong University, Jinan, , 22 – 23, October, 2010

Muon Telescope Detector (2013)

Muon Telescope Detector (MTD) at STAR:1) MRPC technology; με ~ 45%; cover ~60% azimuthally and |y| < 0.25

2) TPC+TOF+MTD: muon/hadron enhancement factor ~ 102-3 3) For high pT muon trigger, heavy quarkonia, light vector mesons, BJ/+X

4) China-India-STAR collaboration: a proposal sub. to BNL 02/2010.

TPCbeam pipe TOF EMC MTDmagnet

Nu Xu 12/15STAR Regional Meeting, ShanDong University, Jinan, , 22 – 23, October, 2010

Summary

STAR QCD physics program for next decade: Spin Physics:

(cold nucleon) - 200 GeV: Δg inclusive and di-jets, γ-jet - 500 GeV: sea quark helicity distributions - 200/500 GeV: transverse spin phenomena

Low-x Physics: (cold nucleus) - Study gluon-rich phenomena at RHIC - Color glass condensate

Heavy Ion Physics: (hot nuclear matter) - Thermalization at √sNN = 200 GeV - QCD phase boundary and critical point - In medium properties

Nu Xu 13/15STAR Regional Meeting, ShanDong University, Jinan, , 22 – 23, October, 2010

Charge for new decadal plans for STAR and PHENIXby Steve Vigdor, Dec. 17, 2009

http://drupal.star.bnl.gov/STAR/event/2009/12/10/star-management-meeting

due date: Oct. 1, 2010

SpinB. Surrow

Heavy IonJ. Dunlop

UpgradeF. Videbaek

Decadal PlanC. Gargliardi

Decadal Plan see Carl’s talk

eSTAR

ePHENIX

eRHIC Design

2 SRF linac1 -> 5 GeV per pass4 (6) passes

Coherent

e-cooler

eRHIC detector

injec

tor

RHIC: 325 GeV p or 130 GeV/u Au with DX magnets

removedS. Vigdor: 2010 Operation review

Nu Xu 15/15STAR Regional Meeting, ShanDong University, Jinan, , 22 – 23, October, 2010

STAR Experiment

MRPC ToF BarrelALICE Technology

BBC

PMD

FPD

FMS

EMC BarrelEMC End Cap

DAQ1000

FGT

COMPLETE

Ongoing

MTD

R&DHFT

TPC

FHC

HLT

pp2pp’ pp2pp’

trigger computing

Nu Xu 16/15STAR Regional Meeting, ShanDong University, Jinan, , 22 – 23, October, 2010

有客之远方来， 不亦乐乎！