Nu Xu 1/16STAR Collaboration Meeting, Nov. 12 – 17, 2010, BNL, USA

STAR Experiment at RHIC:

- Physics Programs

- Management Issues

Nu Xu

Nu Xu 2/16STAR Collaboration Meeting, Nov. 12 – 17, 2010, BNL, USA

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

Fundamental Science: particle physics, nuclear physics, the QCD phase structure (QCD condense matter), astrophysics, cosmology, …

State of Art Technology: detector R&D, simulation, IT, computing, massive/fast data managing, …

- 550 scientists- 55 institutes- 13 countries- 130 PhD thesis since 2000

Nu Xu 3/16STAR Collaboration Meeting, Nov. 12 – 17, 2010, BNL, USA

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 4/16STAR Collaboration Meeting, Nov. 12 – 17, 2010, BNL, USA

Quantum Chromodynamics

1) Quantum Chromodynamics (QCD) is the established theory of strongly interacting matter.2) Gluons hold quarks together forming hadrons:

3) Gluons and quarks, or partons, typically exist in a color singlet state: confinement.4) Little is known about the QCD phase structure

baryonmeson

Nu Xu 5/16STAR Collaboration Meeting, Nov. 12 – 17, 2010, BNL, USA

QCD Phase Structure

Glu

on

dens

ity

Nucleon spinstructure

(a) (b)

(c) (a) Small-x, large gluon density physics. Gluon saturation, origin of mass.

(b) Hadron QGP transition. Partonic degrees of freedom, confinement.

(c) Proton spin structure. Helicity degrees of freedom, collective excitation orbital motion.

Nu Xu 6/16STAR Collaboration Meeting, Nov. 12 – 17, 2010, BNL, USA

Phase Diagram

Phase diagram: A map shows that, at given degrees of freedom,

how matter organize itself under external conditions.

QED QCD

Nu Xu 7/16STAR Collaboration Meeting, Nov. 12 – 17, 2010, BNL, USA

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 8/16STAR Collaboration Meeting, Nov. 12 – 17, 2010, BNL, USA

Particle Identification at STAR

STAR TPC

STAR ToF

STAR EMC

STAR HFT

Neutral particles and Muons

e, μ

πK p d

TPC ToF TPC

Log10(p)

STAR MTD

Multiple-fold correlations among the identified particles!

Hyperons and Hyper-nuclei

Jets Heavy-flavorhadrons

Nu Xu 9/16STAR Collaboration Meeting, Nov. 12 – 17, 2010, BNL, USA

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 10/16STAR Collaboration Meeting, Nov. 12 – 17, 2010, BNL, USA

HFT: Charm Hadron v2 and RAA

200 GeV Au+Au m.b. collisions:

- Charm hadron collectivity drag/diffusion constants

- Medium properties! - Light quark thermalization!

200 GeV Au+Au m.b. collisions:

- Charm hadron RAA

- Energy loss mechanism! - QCD in dense medium! - ΛC measurements

Nu Xu 11/16STAR Collaboration Meeting, Nov. 12 – 17, 2010, BNL, USA

STAR: Muon Telescope Detector

Muon Telescope Detector (MTD) at STAR:

1) MRPC technology; εμ ~ 45%; cover ~60% azimuthally and |y| < 0.25

2) TPC+TOF+MTD: μ/hadron enhancement factor ~ 102-3

3) For high pT μ-trigger, heavy quarkonia, light vector mesons, BJ/+X

4) China-India-STAR collaboration: reviewed by BNL

TPCbeam pipe TOF EMC MTDmagnet

Nu Xu 12/16STAR Collaboration Meeting, Nov. 12 – 17, 2010, BNL, USA

Forward GEM TrackerFGTHFT

1) FGT: RHIC CE project

2) Six light-weight triple-GEM disks

3) New mechanical support structure

4) Planned installation: Summer 2011

1) Charge-sign discrimination at high-pT and forward rapidity

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

yr. 10 11 12 13 14 15 16 17 18 19 20 21

Timeline of QCD and Heavy Ion Facilities

Spin

STAR FGT

BES

RHIC-II

STAR HFT

eSTAR, EIC

US

LR

P

FAIR CBM sis300

LHC

NICA

Oth

ers

RH

IC

Spin Heavy Ion R&D Future programs

J-PARC (50 GeV p+A)

JLab (12 GeV upgrade)

Nu X

u, Se

ptem

ber 2

009

Nu Xu 14/16STAR Collaboration Meeting, Nov. 12 – 17, 2010, BNL, USA

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

STAR: Strong QCD physics programs for the next decade and beyond: 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 200 GeV and in-medium properties - QCD phase boundary and critical point

Future: - Further develop the forward rapidity region - Evolve the collaboration to eSTAR and EIC

Nu Xu 16/16STAR Collaboration Meeting, Nov. 12 – 17, 2010, BNL, USA

Management Issues

(1) STAR Council decides policy.

(2) The management execute the policy.

(3) One collaboration, one standard.