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
Nu Xu 2/21STAR Collaboration Meeting, February 24 – March 1, 2013, BNL
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
Nu Xu 3/21STAR Collaboration Meeting, February 24 – March 1, 2013, BNL
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
Nu Xu 4/21STAR Collaboration Meeting, February 24 – March 1, 2013, BNL
STAR Publications
Total: 144 Publications
Nu Xu 5/21STAR Collaboration Meeting, February 24 – March 1, 2013, BNL
Record on Publications
May, 2012
Nu Xu 6/21STAR Collaboration Meeting, February 24 – March 1, 2013, BNL
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!
Nu Xu 7/21STAR Collaboration Meeting, February 24 – March 1, 2013, BNL
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
Nu Xu 8/21STAR Collaboration Meeting, February 24 – March 1, 2013, BNL
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
Nu Xu 9/21STAR Collaboration Meeting, February 24 – March 1, 2013, BNL
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
Nu Xu 10/21STAR Collaboration Meeting, February 24 – March 1, 2013, BNL
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
Nu Xu 11/21STAR Collaboration Meeting, February 24 – March 1, 2013, BNL
RHIC BES-I Highlights(3) Jet-quenching
(4) NCQ Scaling in v2
sQGP key signatures turned off!
(5) “Local Parity Violation”
Nu Xu 12/21STAR Collaboration Meeting, February 24 – March 1, 2013, BNL
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
Nu Xu 13/21STAR Collaboration Meeting, February 24 – March 1, 2013, BNL
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
Nu Xu 14/21STAR Collaboration Meeting, February 24 – March 1, 2013, BNL
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
Nu Xu 15/21STAR Collaboration Meeting, February 24 – March 1, 2013, BNL
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!
Nu Xu 18/21STAR Collaboration Meeting, February 24 – March 1, 2013, BNL
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
Nu Xu 19/21STAR Collaboration Meeting, February 24 – March 1, 2013, BNL
QCD Phase Structure
RHIC/LHC EIC (eRHIC)
Study phase structure with QCD degrees of freedom
Hot QCD Matter Cold QCD Matter
Nu Xu 20/21STAR Collaboration Meeting, February 24 – March 1, 2013, BNL
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
Nu Xu 21/21STAR Collaboration Meeting, February 24 – March 1, 2013, BNL
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
Nu Xu 22/21STAR Collaboration Meeting, February 24 – March 1, 2013, BNL
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