star experiment
DESCRIPTION
STAR at RHIC Nu Xu Lawrence Berkeley National Laboratory. STAR Experiment. Outline. Introduction 2) STAR Physics Program - Physics working group - Upgrade programs - Run plan for 2009 – 2013* * As prepared in May 2008 3) Summary and Questions. Physics Goals at RHIC. - PowerPoint PPT PresentationTRANSCRIPT
Slide 1
STAR Experiment
STAR at RHIC
Nu Xu
Lawrence Berkeley National Laboratory
Nu Xu#/20STAR Regional Meeting, VECC, India, November, 2008 1OutlineIntroduction2) STAR Physics Program- Physics working group- Upgrade programs- Run plan for 2009 2013* * As prepared in May 2008
3) Summary and Questions
Nu Xu#/20STAR Regional Meeting, VECC, India, November, 2008 2- Identify and study the property of matter (EOS) with partonic degrees of freedom. - Explore the QCD phase diagram.
- Study the origin of spin in p.
- Investigate the physics at small-x, gluon-rich region. Physics Goals at RHICRHIC
Au+Au, Cu+Cu, d+Au, p+pat200 5 GeV
Polarized p+p at 200 & 500 GeV
p+p, d+Aupp2pp Nu Xu#/20STAR Regional Meeting, VECC, India, November, 2008 STAR Physics Focus
1) At 200 GeV top energy - Study medium properties, EoS - pQCD in hot and dense medium
2) RHIC beam energy scan - Search for critical point - Chiral symmetry restoration
Polarized spin program - Study proton intrinsic properties Forward program - Study low-x properties, search for CGC - Study elastic (inelastic) processes (pp2pp) - Investigate gluonic exchanges
Nu Xu#/20STAR Regional Meeting, VECC, India, November, 2008 4STAR Physics Working GroupsSpin:g contribution to spin structure
UPC: UPC, pp2pp
Heavy Flavor:c-, b-quark hadrons
Light Flavor Spectra: u-, d-, s-quark hadrons, di-leptons, photons
Bulk Correlations:v1, v2, correlations/fluctuations
Jet Correlations: high-pT triggered correlationsNu Xu#/20STAR Regional Meeting, VECC, India, November, 2008
STAR DetectorMRPC ToF barrel100% ready for run 10RPSDPMDFPDFMSEMC barrelEMC End CapDAQ1000100% ready for run 9CompleteOngoingR&DTPCFTPCFull azimuthal particle identification!, e, , , K, K*, p, , , , , , D, C, J/, Nu Xu#/20STAR Regional Meeting, VECC, India, November, 2008 6
STAR DetectorMRPC ToF barrel100% ready for run 10RPSDPMDFPDFMSEMC barrelEMC End CapDAQ1000FGTCompletedOngoingMTDR&DHFTTPCFHCNu Xu#/20STAR Regional Meeting, VECC, India, November, 2008 7
HFTTPCFGT STAR Detectors: Full 2 particle identification!
EMC+EEMC+FMS(-1 4)TOF
DAQ1000Nu Xu#/20STAR Regional Meeting, VECC, India, November, 2008 8Particle Identification at STAR
STAR TPC
STAR ToF
STAR EMC
STAR HFTNeutral particles Strange Jets Heavy Quark hyperons Hadrons
Multiple-fold correlations among the identified particles! e, K p d
TPC ToF TPCLog10(p)Nu Xu#/20STAR Regional Meeting, VECC, India, November, 2008 Particle Identification (ii)
Reconstruct particles in full azimuthal acceptance of STAR!
Charm BottomNu Xu#/20STAR Regional Meeting, VECC, India, November, 2008
9.2 GeV Collider Acceptance
sNN
6 GeV
17 GeV
sNN = 9.2 GeV Au+Au Collisions at RHIC Fix-target Mode NA49 Collider Mode STARNu Xu#/20STAR Regional Meeting, VECC, India, November, 2008 Bedanga Mohanty11sQGP and the QCD Phase Diagram In 200 GeV Au+Au collisions at RHIC, strongly interacting matter formed:- Jet energy loss: RAA- Strong collectivity: v0, v1, v2- Hadronization via coalescence: nq-scaling
Questions:Is thermalization reached at RHIC?- Systematic analysis with dN/dpT and dv2/dpT results - Heavy quark measurements
When (at which energy) does this transition happen?What does the QCD phase diagram look like?- RHIC Beam Energy ScanNu Xu#/20STAR Regional Meeting, VECC, India, November, 2008 12Quark Masses
Higgs mass: electro-weak symmetry breaking. (current quark mass)QCD mass: Chiral symmetry breaking. (constituent quark mass) New mass scale compared to the excitation of the system.
Important tool for studying properties of the hot/dense medium at RHIC.
Test pQCD predictions at RHIC.Total quark mass (MeV)Nu Xu#/20STAR Regional Meeting, VECC, India, November, 2008 13Charm Hadron v2 and RAA 200 GeV Au+Au m.b. collisions (500M events). - Charm hadron collectivity drag/diffusion constants
Medium properties!
200 GeV Au+Au m.b. collisions (|y| ends on April 5th 5 weeks at 500 GeV
- IF sufficient fy09 funds arrives total of 22 cryo-weeks => 4 weeks at 500 GeV plus 11-12 weeks at 200 GeV longitudinally polarized p+p collisions to measure g(x) at a FoM: 6.5 pb-1
Run 06
Run 09de Florian et al, arXiv: 0804.0422Nu Xu#/20STAR Regional Meeting, VECC, India, November, 2008 Summary STAR collaboration and its physics program are strong:- more groups join in- best positioned for Exploring the QCD phase diagram- best equipped for g measurements at the highest energy polarized proton collider- Excellent for precision measurements and great potential for new discoveries
Complementary to ALICE at LHC at higher energy Complementary to CBM at FAIR at lower energy
Problems: (1) Stable funding for upgrades and beam time (2) Need more collaborators to work on detector Nu Xu#/20STAR Regional Meeting, VECC, India, November, 2008 RunEnergy (GeV)SystemTimeGoal
9
(s = 200p( p(12 week50 pb-1 P4L 6.5 pb-1
(s = 500p( p(2 weekCommissioning
(s = 200p( p( weekpp2pp
(sNN = 200Au + Au3 week0.3B minbias, 0.5 nb-1
(sNN = 5Au + Au week*Commisioning
10(sNN = 39 6.1Au + Au14 week1st energy scan
(sNN = 5Au + Au1 weekCommisioning
(sNN = 200Au + Au2 week200M central
(sNN = 200Au + Au1 week50M central
(s = 200p( p( weekpp2pp
(s = 500 or 200p( p( or p( p(4 weekSpin studies
RunEnergy (GeV)SystemTimeGoal
11(s = 200p( p( or p( p(6 week20-30 pb-1
(s = 500p( p( or p( p(15 week150 pb-1
(sNN = 200U + U2 weekCommissioning
12(sNN = 200Au + Au12 week0.5B minbias, 5 nb-1
(sNN = 39 - 5Au + Au13 week2nd energy scan
13(s = 200p( p( or p( p(13 week2B minbias, 100 pb-1
(s = 500p( p( or p( p(12 week300 pb-1