Nov.14-20, 2006 QM200 6 Shanghai J.WU USTC 1 A barrel TOF for STAR at RHIC Outline Introduction Performance of STAR-TOF prototypes Physics results: achieved & expected Summary and outlook Jian WU for the STAR Collaboration Department of Modern Physics, USTC
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Nov.14-20, 2006 QM2006 Shanghai J.WU USTC1 A barrel TOF for STAR at RHIC Outline Introduction Performance of STAR-TOF prototypes Physics results:
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Nov.14-20, 2006 QM2006 Shanghai
J.WU USTC 1
A barrel TOF for STAR at RHIC
Outline
Introduction
Performance of STAR-TOF prototypes
Physics results: achieved & expected
Summary and outlook
Jian WU for the STAR Collaboration Department of Modern Physics, USTC
Nov.14-20, 2006 QM2006 Shanghai
J.WU USTC 2
Introduction Solenoidal Tracker At RHIC (STAR)
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IntroductionWhy STAR-TOF ?
Identified hadron spectra• freeze-out dynamics• hadronization mechanism• Heavy flavor
Identified particle correlations• Chemical and kinetic properties of in-medium jet associated spectra• Fluctuations and correlations • Heavy flavor
Lepton program• In-medium vector meson properties• Heavy flavor
Performance of STAR-TOF prototypesAchievements from the prototype
86 ps overall timing resolution achieved in 200GeV Au+Au collisions.
3.15 cm 6.30 cm, 200GeV Au+Au occupancy<10%
Rate capability: ~300 Hz/cm2 (test beam, CERN)
High efficiency: > 95%
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Performance of STAR-TOF prototypesTime resolutions in Runs
Operation conditions
Time Resolution (ps)
pVPDTOFr
(overall)
TOFr
(intrinsic)
Run III200GeV d+Au ~85 ~120 ~85
200GeV p+p ~140 ~160 ~80
Run IV
62GeV (Au+Au) ~55 ~105 ~89
200GeV (Au+Au)
FF/RFF ~27 ~86(74) ~82(70)
HF ~20 ~82(74) ~80(71)
Run V200GeV Cu Cu (ToT) ~ 50 ~105(92) ~92(75)
62GeV Cu Cu (ToT) ~ 82 ~125 ~94
M. Shao QM2006 Poster
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Performance of STAR-TOF prototypes Hadron/Electron PID capability
Hadron PID: (, K) ~1.6 GeV/c p ~ 3 GeV/c.
STAR Collaboration, PLB 616(2005)8
|1/β-1|<0.03
Clean electron PID can be obtained up to PT< 3 GeV/c. This has been used to measure the semi-leptonic decay of
open charm. STAR Collaboration, PRL 94(2005)062301
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Performance of STAR-TOF prototypes Muon identification at low pT
e
μ
π
0.15<pT<0.25 GeV/c, DCA<3cm Chen ZHONG (QM2006)Session: Heavy quark production
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Performance of STAR-TOF prototypes φ background suppression
STAR Preliminary
TOF+TPC : one kaon from φ identified by TPC, the other by TOF TPC+TPC : the 2 kaons from φ identified using only TPC
Au+Au 200GeV min-bias
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Performance of STAR-TOF prototypes PID by combining TOF+TPC
TOF alone, (, K) ~1.6 GeV/c , p ~ 3 GeV/c.
TOF+dE/dx+rdE/dx ( ,p) 0.3~12 GeV/c
M. Shao et al., NIMA 558, (419) 2006
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Physics results
Phys. Rev. Lett. 97 152301(2006)
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Physics results
Identified baryon and meson distributions at large transverse momenta from Au+Au collisions at 200 GeV, Phys. Rev. Lett. 97 152301(2006) PID Cronin Effect in d+Au, Phys. Lett. B 616 (2005) 8 Charm Cross section and spectra in p+p, d+Au, Phys. Rev. Lett. 94 (2005) 062301
A lot of conference proceedings, QM04, SQM04, QM05, SQM06 talks. 6 Ph. D theses.
10 NIM publications:Nucl.Instrum.Meth.A 478:176-179, 2002 (B. Bonner et al)
Nucl.Instrum.Meth.A 492:344-350, 2002 (M. Shao et al)Nucl.Instrum.Meth.A 508:181-184, 2003 (B. Bonner et al)
Nucl.Instrum.Meth.A 533:60-64, 2004 (F. Geurts et al) Nucl.Instrum.Meth.A 537:698-702, 2005 (Y. Wang et al) Nucl.Instrum.Meth.A 538:243-248, 2005 (J. Wu et al)
Nucl.Instrum.Meth.A 538:425-430, 2005 (Y. Wang et al) Nucl.Instrum.Meth.A 547:334-341, 2005 (Y. E. Zhao et al)
Imagine what we can accomplish with Full TOF (120 trays)
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Physics results expected Physics with Full Barrel TOF - I
Event reduction factor for two particle decays (achieving the same signal statistical significance)
Particle pT range (GeV/c) (TPC+TOF)/TPC
K*0 0-1 2.0
K*0 1-2 1.85
K*0 2-3 1.74
K*0 3-5 1.39
0-2 5.0
2-5 3.42
Λ* 0-1.6 11.4
D0 0-5 4.6
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Physics results expectedPhysics with Full Barrel TOF - II
TPC+TOF+SSD+HFT ~ 200M Central AuAu events : 22Kand 6K vector meson for one year RHIC running
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Physics results expected Physics with Full Barrel TOF - III
Measurement Physics Goal
all particle v2, especially increasing the efficiency for multi-strange particle v2 measurement
Fix the partonic collectivity parameters
Fluctuation/ correlation studies with PID Understand the nature of possible phase transition
Away-side jet fragmentation yields, spectra Search for Mach cone
Yields, spectra of high-mass resonancesMap out most of the resonances (if it is not all) from RHIC
Unlike-particle (e.g., -) correlationsSpatial and temporal distributions of hadron production
Charmed hadron flow and yield ratiosCharm collectivity and thermalization of light quarks (u,d,s)
Heavy quark jets; D,B-meson spectra at high pTProbe partonic medium and understand the nature of parton interactions, i.e. parton energy loss
Inclusive lepton and di-lepton spectra and invariant mass distributions
Study possible in-medium modification of hadrons.
e+e pair production in UPC Strong field QED effects
o longitudinal polarization correlations CP violation search
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Summary and outlook MRPC Status & Plans
StatusMRPC Standard production procedure setupQuality check measurements definedWeb Parameter Database installed
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Summary and outlook MRPC Status & Plans
Tray assembly instruments at UT-Austin
MRPC production facility at Tsinghua and USTC
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Summary and outlook
The advantages of new technology – MRPC: good timing resolution, high efficiency , cost effective large area Time of Flight detector.
The prototype of TOF detectors in STAR work well, and satisfy the requirements. TOF prototype detectors have already provided important physics results!