Outline

Nu Xu 1/21STAR Collaboration Meeting, February 24 – March 1, 2013, BNL

February 25, 2013

STAR Experiment at RHIC Study emergent properties of matter with QCD degrees of freedom

Nu Xu (1) College of Physical Science & Technology, Central China Normal University, Wuhan, 430079, China (2) Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA


Outline

(1) Introduction: Study the emergent properties of QCD matter

(3) Selected Recent Results- On the new ΔG results- Di-electron measurements

- RHIC BES-I results

(3) STAR Detector and Forward Expansion


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- 154 PhD thesis completed since 2001 (Feb. 2013)

STAR Collaboration

http://www.star.bnl.gov/


STAR Publications

Total: 144 Publications


Record on Publications

May, 2012


Data Sets at STAR Experiment

Heavy Ion Collisions Polarized p+p Collisions

- RHIC&STAR upgrades lead to dramatic increase data statistics- The best of STAR is still ahead of us: Precision measurements!


STAR 2nd Summary PaperMembership: D. Cebra, X. Dong, J. Dunlop, O. Evdokimov, C. Gagliardi, H.Z. Huang, D. Keane, B. Mohanty (Chair), E. Sichtermann, P. Sorensen, B. Surrow, S. Wissink, N. Xu, Z.B. Xu

Charges: This committee will work with the collaboration as a whole to write a concise and comprehensive summary of experimental results, from both heavy-ion collision and spin physics, since 2005. Based on the understanding of these results and the theoretical developments, the science case for continuing operation of RHIC during 2015-2020 should be outlined in the document. This White Paper is expected to be submitted to a refereed journal for publication in early 2013.The relevant part of the executive summary of the White Paper will be used for providing input to the NSAC Long Range Plan Implementation Subcommittee as well as the Community White Paper to be organized by APS.

Structure of the document:Chapter 1: Introduction Chapter 2: Review conclusions from previous white paperChapter 3: New theoretical ideas Chapter 4: Initial conditionsChapter 5: Properties of sQGP Chapter 6: Exploring the QCD phase diagram (BES-I)Chapter 7: Spin physics Chapter 8: Outlook and future directions

Timelines for the document: - Executive summary by end of August 2012 - Full document by February, 2013

1) Summarize results since 2005 wp2) Include both HI + Spin results3) Focus the publication process


Precision Spin Results at RHIC

Δu Δd

€

Δg(x,Q2 =10GeV2)dx = 0.10−0.07+0.06

0.05

0.2

∫

€

p :1

2h

q :1

2ΔΣ ≈ 0.3h

g : ΔG ~ 0.10−0.07+0.06h


Di-lepton: Penetrating-Bulk Probe

1) Direct radiation, penetrating-bulk probe, new to STAR!2) Beam energy, pT, centrality, mass dependence (8-10x more events):

RAA, v2, radial expansion, HBT, polarization, … 3) HFT/MTD upgrades: key for the correlated charm contributions.

√s = 200 GeV p+p Au+Au MinBias Au+Au Central

PRD86, (12)24906; arXiv:1204.1890


RHIC BES-I Highlights

(1) Net-proton High Moments (2) ϕ-meson Productions

(1) Critical Fluctuations: Search for QCD critical point

(2) Multi-strange hadrons: isolate the QCD phases


RHIC BES-I Highlights(3) Jet-quenching

(4) NCQ Scaling in v2

sQGP key signatures turned off!

(5) “Local Parity Violation”


2 TE RHIC, SPS, FAIR

3

3 Phase boundaryRHIC, FAIR, NICA

Exploring QCD Phase Structure

1

1 Tini, TC

LHC, RHIC

2

Par

ton

ic M

atte

r

Had

ron

ic M

atte

r


STAR BUR for Runs 13 and 14

Run 13: 20 cryo-week. 510pp: 55% polarization, 15 – 20 cryo-weeks

Run 14: 20 cryo-week. 200pp: 65% polarization

Run * Beam Energy Time System Goals

13

3

s = 510 GeV

4 daysp p σTOT, AN, ANN, ASS, Exclusive

Central Production

1 10 weeks p p i) W± AL: P2*L= 50 pb-1

ii) di-jets ALL: P4*L= 15 pb-1

2 sNN = 200 GeV 4 weeks Au + Aui) MTD e-μ correlation, 2 nb-1

(280M central events)ii) HFT engineering run

141 sNN = 200 GeV 10 weeks Au + Au

i) HFT & MTD heavy flavor, 10 nb-1(500M M.B.)ii) Fixed-target data taking

2 s = 200 GeV 5 weeks p p

i) Heavy ion reference data L= 40 pb-1 (500M M.B.)ii) Δg, L= 40 pb-1

2-3 week of Au+Au collisions at 15 GeV


Particle Identification at STAR

TPC

TOF

EMC

HFT

Neutral particles

e, μ

πK p d

TPC TOF TPC

Log10(p)

Multiple-fold correlations for the identified particles!

Hyperons & Hyper-nuclei

Jets

Heavy-flavor hadrons

MTD

High pT muonsJets & Correlations

Charged hadrons

http://www.star.bnl.gov/protected/spectra/ruanlj/TOFrpaper/tofr_beta_p_prplot.gif


STAR Detector Configurations

STAR: Large coverage, excellent PID, fast DAQ - detects nearly all particles produced at RHIC

- multiple fold correlation measurements

- Probes: bulk, penetrating, and bulk-penetrating

STAR: Perfect mid-y collider experiment

STAR: Expanding into forward rapidity regions

Period Detectors Physics

2001-2010 TPC u, d, s

2010 TPC + TOF u, d, s + dilepton

2013 TPC + TOF + MTDu, d, s, c, b + dilepton2014 TPC + TOF + MTD + HFT

HFTTPC

TOFBEMCMTD EEMC GEM

η = -1 η = 0 η = 1

STAR Detector System (2014)

p/Ae

0

EMCal iTPC Tracking PID EM/HCalTracking

HFTTPC

TOFBEMCMTD EEMC GEM

η = -1 η = 0 η = 1

STAR Forward Upgrade Plan (2018)

HLT

Built on the mid-y success: Evolution, not revolution!

(1) eSTAR taskforce: E. Sichtermann and Z.B. Xu(2) STAR Upgrade/Decadal Plan: C. Gagliardi, H. Huang and F. Videbaek

Be part of STAR’s forward upgrades!


2 TE RHIC, SPS

3

3 Large μB

NICA, FAIR

Exploring the QCD Phase Structure

1

1 Tini, TC

LHC, RHIC

2P

arto

nic

Mat

ter

Had

ron

ic M

atte

r

LHC+RHICsQGP properties

√sNN ~ few TeV

RHIC BES-IIQCD phase

structure and critical point √sNN ≤ 20 GeV

NICA/FAIRQCD phase structure

√sNN ≤ 12 GeV

Future eRHICCold nuclear

matter properties

e + ion collisions

Emergent properties of QCD matter


QCD Phase Structure

RHIC/LHC EIC (eRHIC)

Study phase structure with QCD degrees of freedom

Hot QCD Matter Cold QCD Matter


2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024

pp HI pp/HI HI pp pA/HI pA pA ep ep/eA ep/eA

Study QCD Phase Structure

HFT/MTD: HF, dileptons HFT’

BES-I e-cooling&iTPC BES-II, √sNN ≤ 20GeV

Upgrades at large-y & iTPC, CGC, pdf eSTAR/eRHIC

NICA/CBM Experiment (QCD phase structure)

LH

C

FA

iR

R

HIC

LHC √sNN = 5.5 TeV (sQGP properties)

Spin: Δg, W±, AN

STAR CorePrograms

x10 x100


Summary

1) STAR at RHIC: Dedicated facility/Detector for studying matter with QCD degrees of freedom:

- Properties of QGP- Sea quark and gluon contributions to proton helicity structure

- QCD critical point, phase boundary

2) Near Future: Forward upgrades and eSTAR

3) Future: EIC (eRHIC, ~2020 - …) - Partonic structures of nucleon and nuclei - Dynamical evolution from cold nuclear matter to hot QGP

Emergent Properties of QCD Matter

Phase Structures of QCD Matter


BNL PAC, 21 - 22, 2010

Heavy Flavor Tracker (HFT) 2013

Time Projection Chamber (TPC)

FGT 2011

STAR Detector Fast and Full azimuthal particle identification

EMC+EEMC+FMS(-1 ≤ ≤ 4)

MRPC Time Of Flight

DAQ1000

MTD 2013

HLT

Documents

Outline