future heavy flavor program at star

X. DongJan. 6th, 2011 HF Workshop, Purdue

Future Heavy Flavor Program

at STAR

Xin Dong

for the STAR CollaborationLawrence Berkeley National Lab

2X. DongJan. 6th, 2011 HF Workshop, Purdue

Heavy Ion Frontiers

1 Quantify the medium properties

LHC


Outline

Physics Motivations

STAR Approach and Detector Upgrade Plans

Physics Capabilities of Future HF Measurements

Summary


What we’ve learned

A hot and dense matter with strong partonic collectivity has been formed at RHIC!

STAR: NPA 757, 102 (2005); QM2009

High pT: Jet quenching

Low pT: Hydrodynamic behaviorMulti-strange hadrons flow

Intermediate pT: Number of Constituent Quark scalingMulti-strange hadrons flow as light hadrons


STAR PRL 98 (2007) 192301

Heavy Quark E in hot QCD medium

Heavy quark decay electrons - mixture of charm and bottom decays

RAA(e) ~ RAA(h)

Contradict to the naïve radiative energy loss mechanism

Re-visit the energy loss mechanisms Require direct measurements of charm or bottom hadrons for clear understanding


Heavy Quarks to Probe Early Thermalization

B. Mueller, nucl-th/0404015 Heavy quarks created at early stage of HIC, and sensitive to the partonic re-scatterings. Heavy quark collectivity/flow to quantify the thermalization degree at the top energy. Thermalization - essential to the RHIC Beam Energy Scan program.

charm quarks


Heavy Quarkonia - QGP Thermometer

O. Kaczmarek & F. Zantow, PRD 71 (2005) 114510

2-Flavor QCD

A. Mocsy & P.Petreczky, PRL 99 (2007) 211602

T/TC 1/r [fm-1]

(1S)

J/(1S) ’(2S)

c(1P)’ (2S)b’(2P) ’’(3S)TC

2

1.2

b(1P)

Quarkonia suppression due to color screening - a classic QGP signatureT. Matsui and H. Satz, PLB 178 (1986) 416

Sequential dissociation - Quarkonia as a QGP thermometerH. Satz, NPA 783 (2007) 249c; A. Mocsy & P. Petreczky, PRL 99 (2007) 211602


STAR Approach

Detection capability at mid-rapidity, full azimuth

large and uniform acceptance

allowing precision correlation measurements

1) Direct topological reconstruction of open charmed hadrons in HI collisions• No ambiguities in the charm hadron kinematics• No ambiguities in the charm/bottom hadron mixture• Significantly improved significance by reconstructing the secondary decay vertices.

2) Quarkonia measurements via both di-electron/di-muon channels• Triggerable di-muon channel to sample full luminosity• No bremmestrahlung tail in di-muon channel so allow separation of three Upsilon states

STAR Decadal Plan Documents:http://www.bnl.gov/npp/docs/STAR_Decadal_Plan_Final%5B1%5D.pdf


STAR Detector


Full Barrel Time-Of-Flight

|1/-1|<0.03

Full barrel completed for Run 10.

- Extended hadron PID to intermediate pT

- TOF/TPC allows electron PID down to very low momentum

Bring benefits to both open HF and quarkonia program in the future.


TPC Volume

Outer Field Cage

Inner Field CageSSDISTPXL

FGT

HFT

Heavy Flavor Tracker (HFT)


HFT consists of 3 sub-detector systems inside the STAR Inner Field Cage (IFC)

Heavy Flavor Tracker

DetectorRadius

(cm)Hit Resolution

R/ - Z (m - m)Radiation

length

SSD 22 30 / 860 1% X0

IST 14 170 / 1800 1.32 %X0

PIXEL8 8 / 8 ~0.37 %X0

2.5 8 / 8 ~0.37% X0

SSD existing single layer detector, double side strips (electronic upgrade)

IST one layer of silicon strips along beam direction, guiding tracks from the SSD through PIXEL detector. - proven strip technology

PIXEL double layers, 18.4x18.4 m pixel pitch, 2 cm x 20 cm each ladder, 10 ladders, delivering ultimate pointing resolution. - new active pixel technology


2.5 cm radius

8 cm radius

Inner layer

Outer layer

End view

One of two half cylinders

20 cm

coverage +-1total 40 ladders

Pixel Geometry


Pointing resolution (12 19GeV/pc) m

Layers Layer 1 at 2.5 cm radiusLayer 2 at 8 cm radius

Pixel size 18.4 m X 18.4 m

Hit resolution 8 m rms

Position stability 6 m (20 m envelope)

Radiation thickness per layer

X/X0 = 0.37%

Number of pixels 436 M

Integration time (affects pileup) 0.2 ms

Radiation requirement

20-90 kRad

Rapid detector replacement

< 8 Hours

criticalanddifficult

more than a factor of 3 better than other vertex detectors (ATLAS, ALICE and PHENIX)

Some pixel features and specifications


A detector with long-MRPCs covers thewhole iron bars and leave the gaps in- between uncovered. Acceptance: ||<0.5 and 45% in azimuth

118 modules, 1416 readout strips, 2832 readoutchannels

Long-MRPC detector technology, HPTDCelectronics (same as STAR-TOF)

Muon Telescope Detector (MTD)


Total resolution: 109 psMTD intrinsic resolution: 96 ps

satisfying the design goal

System spatial resolution: 2.5 cm, dominated by multiple scattering

expected from simulation

σ: 109 ps

σ: 2.5 cm

pure muonspT: ~6 GeV/c

MTD (Run 10 Prototype) Performance

position difference (cm)


di-muon pairs from heavy quarkonia decays

single muons from the semi-leptonic decays of heavy flavor hadrons

e-mu correlations to distinguish HF production from initial di-lepton production

Advantages over electron channels: no conversion, much less Dalitz decay contribution

Much less combinatorial backgroundless affected by radiative losses in the detector materials

excellent mass resolution, allowing separation of three Upsilon statestriggerable in Au+Au

sample full luminosity from low to high pT for J/ in central AA collisions

MTD Detecting Probes


Upgrade Schedule

2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 …

DAQ1k

TOF

HFT

MTD

RHIC II


Future Open HF Measurements

HFT + TPC + TOFtopological reconstruction of all ground state charmed hadrons

HFT + TPC + TOF + EMC/MTDsingle electron/muon from semi-leptonic decays of charm/bottom hadrons

- with HFT allows to separate charm/bottom contributionse or mu induced correlation measurements


RCP=a*N10%/N(60-80)%

Physics Projections

Assuming D0 v2 distribution from quark coalescence.

500M Au+Au m.b. events at 200 GeV. - Charm v2

Thermalization degree!Drag coefficients!

Assuming D0 Rcp distribution as charged hadron

500M Au+Au m.b. events at 200 GeV.- Charm RAA Energy loss mechanism! Interaction with QCD matter!


Charm Baryons

cpK Lowest mass charm baryons c = 60 m

c/D enhancement? 0.11 (pp PYTHIA) 0.4-0.9 (Di-quark correlation in QGP)

S.H. Lee etc. PRL 100 (2008) 222301 Total charm yield in heavy ion collisions


Access Bottom Production via Electrons

Two approaches:

a) Statistical fit with model assumptions

b) With known charm hadron spectrum

to constrain or be used in subtraction

(a) HQ decay electrons spectra/v2

Charm hadron spectra/v2

Charm decay electron spectra/v2

Bottom decay electron spectra / v2

(b)


Curves: H. van Hees et al. Eur. Phys. J. C 61 (2009) 799

Statistical Projections on eB Spectra / v2

(Be) spectra obtained via the subtraction of charm decay electrons from inclusive NPEs: no model dependence, reduced systematic errors.


e correlation with Muon Telescope Detector at STAR from ccbar: S/B=2 (Meu>3 GeV/c2 and pT(e)<2 GeV/c) S/B=8 with electron pairing and tof association

L. Ruan et al., JPG 36 (2009) 095001

e-mu correlations

ccbarDrell-YanThermal radiation


Heavy Quarkonia Program

A) Up to 2013 (TPC+TOF+EMC)

Charmonia:low pT from minibias sample - limited statisticshigh pT from single electron HT trigger - efficient and can sample the full luminosity

will carry on at RHIC IIBottomonia:

di-electron channel - material effect from inner tracker / limited statistics

B) 2014 and beyond (HFT+TPC+TOF+EMC+MTD)

Charmonia:di-muon channel covers from low to high pT

high pT from single electron HT triggerBottomonia:

di-muon channel - excellent in mass resolution and able to sample full luminositydi-electron channel within HFT acceptance - limited statistics


Heavy Quarkonia via di-electrons

Run7 AuAu 300 ub-1

Run 6 p+p 8 pb-1

Run 7 Au+Au 300 ub-1

Run 9 p+p 20 pb-1

Run 10 Au+Au 1.4 nb-1

Limited statistics -> Multi year physics program

R. Reed, HP 2010STAR, PRC80 (2009) 041902(R)

J/

Single electron HT trigger to reach high pT J/


J/ efficiency

1. muon efficiency at |η|<0.5: 36%, pion efficiency: 0.5-1% at pT>2 GeV/c2. dimuon trigger enhancement factor from online trigger: 40-200 in central

Au+Au collisions

J/ with MTD


Upsilon Mass Resolution with MTD

Di-electrons with material from inner tracker

Di-electrons with no material from inner trackerDi-muons from any case

2008 to 2013: di-electrons are a good probe for Upsilonshowever, limited by statistics / luminosity

2014 - : di-electrons suffer from inner HFT material - hard to separate three states di-muons will be a great probe to measure different Upsilon states with RHIC II


Υ

J/ RAA and v2

Υ RAA vs. Npart

J/

J/

Projections on Quarkonia Measurements


BJ/ + X with HFT+TPC+MTD

Prompt J/

J/ from B

HFT to separate B decay J/ from prompt J/ MTD to reconstruct J/ from di-muon decays


Charm to Probe Nucleon/Nucleus Structure

K.Kurek, Spin Workshop @LBL 2009


Summary

Heavy flavor physics will be one of the key measurements in quantifying the medium properties at the RHIC II era.

STAR HFT and MTD upgrades together with existing subsystems allow precision measurements on both open heavy flavor and quarkonia production at mid-rapidity with RHIC II luminosities.

STAR Decadal Plan:

http://www.bnl.gov/npp/docs/STAR_Decadal_Plan_Final%5B1%5D.pdf

Continue the ongoing heavy ion and spin programs with pp, pA and AA Complement with ep and eA programs / evolve to eSTAR@eRHIC

BACKUP SLIDES


Measure production rates, high pT spectra, and correlations in heavy-ion collisions at sNN = 200 GeV for identified hadrons with heavy flavor valence quarks to constrains the mechanism for parton energy loss in the quark-gluon plasma

DOE milestone 2016


Lee, et. al, PRL 100 (2008) 222301

Direct (hard) fragmentation in elementary collisions. However, in heavy ion collisions …

Charm Quark Hadronization

V. Greco et al., PLB 595(2004)202

Coalescence approach

Charm baryon enhancement ? - coalescence of c and di-quark


Charm cross section

STAR, PRL 94 (2005) 062301, arXiv: 0805.0364, QM08PHENIX, PRL 96 (2006) 032001, 96 (2006) 032301, 97 (2006) 252002, PRD 76 (2007) 092002, QM08

Big experimental (statistical & systematical) uncertainties Extrapolated from electron channel Hadronic channel suffered huge combinatorial background No knowledge about charm chemistry

Need precision measurements on various charm hadrons via displaced vertices


Electrons - Incomplete Kinematics

New micro-vertex detector is needed for precision measurements on charmed hadrons production in heavy ion collisions


Summary

MTD will advance our knowledge of Quark Gluon Plasma: trigger capability for low to high pT J/ in central Au+Au collsions

excellent mass resolution, separate different upsilon states

e-muon correlation to distinguish heavy flavor production from initial lepton pair production

rare decay and exotics …

different background contribution provides complementary measurements for dileptons The prototype of MTD works at STAR from Run 7 to Run 10. Results published at L. Ruan

et al., Journal of Physics G: Nucl. Part. Phys. 36 (2009) 095001; 0904.3774; Y. Sun et al., NIMA 593 (2008) 430.

muon purity>80%; the primary muon over secondary muon ratio: good

for quarkonium program

the trigger capability with L0 and L2: promising for dimuon program:

Upsilon, J/ elliptic flow v2 and RAA at high pT

The larger Run 11 modules with slightly wider readout strips show a comparable performance as the modules in Runs 7-10, based on cosmic ray tests at USTC and Tsinghua.


Monolithic Active Pixel Sensor (MAPS) from IPHC Commercial CMOS technology Thin - 50 m silicon Small pixels, high resolution Fast readout

Air cooling Mechanical stability

Hybrid uncertainty area--------------------------------MAPS uncertainty area

pointing accuracy comparison

Pixel Technology

Hybrid: 50 x 450 1.2% X0

MAPS: 18.4 x 18.4 0.37% X0


Alternate Technologies Considered

Hybrid X0 large (1.2%)

Pixel Size large (50 m x 450 m) Specialized manufacturing - not readily available

CCDs Limited radiation tolerance Slow frame rate, pileup issues Specialized manufacturing

DEPFET Specialized manufacturing very aggressive unproven technology


Pointing Resolution Performance

2 2

GEANT: Realistic detector geometry + Standard STAR trackingincluding the pixel pileup hits at RHIC-II luminosity

Hand Calculation: Multiple Coulomb Scattering + Detector hit resolutionPXL telescope limit: Two PIXEL layers only, hit resolution only

Mean pT

30 m


Reconstruction of Displaced Vertices

D0 decays

particle c (m) Mass (GeV)

D0 123 1.865

D+ 312 1.869

Ds+ 150 1.968

c+ 60 2.286

B0 459 5.279

B+ 491 5.279

Direct topological reconstruction of charm and bottom decays


Efficiency / SignificanceNeed New plots

D0 spectrum covering 0.5 - ~10 GeV/c in one RHIC run


Al vs. Cu Cable

Thin: Aluminum (0.37% X0)Thick: Copper (0.52% X0)

Aluminum cable will improve the low pT significance by ~ 1.5- running time need to be ~ 2 times longer to achieve the same precision


More Charm Hadrons

D+KMass = 1.869 MeV

c=312m


B capability -- electron channels

particle c (m) Mass (GeV)

qc,b →x (F.R.)

x →e (B.R.)

D0 123 1.865 0.54 0.0671

D± 312 1.869 0.21 0.172

B0 459 5.279 0.40 0.104

B 491 5.279 0.40 0.109

1) Be = NPE De

2) The distance of closest approach to primary vertex (dca):

Due to larger c, B e has broader distribution than D e

Dca of D+ e is more close to that of B e. need more constraint.

B.R. = Branching RatioF.R. = Fragmentation Ratio

Pixel layers

dca

dca: the distance of closest approach to primary vertex


Curves: H. van Hees et al. Eur. Phys. J. C61, 799(2009).

Statistical Projections on eB Spectra

(Be) spectra obtained via the subtraction of charm decay electrons from inclusive NPEs: no model dependence, reduced systematic errors.

Need update


Dashed-curves: Assumed D0-mesom v2(pT)- in coalescence model

Symbols: D decay e v2(pT)

Vertical bars: errors for b decay e v2(pT) from 200 GeV 500M minimum bias Au + Au events

Statistical Projections on eB v2

Assuming D meson v2 from quark coalescence (curves).

r v2(eB) + (1-r) v2(eD) = v2(NPE)r is the eB/(eD+eB) ratiov2(eD) is D e v2

v2(eB) is B e v2 , which can be extracted from this equation.

Need update


1)The STAR HFT measurements (p+p and Au+Au) (1) Heavy-quark cross sections: D0,±,*, DS, C , B…

(2) Both spectra (RAA, RCP) and v2 in a wide pT region.

(3) Charm hadron correlation functions

(4) Full spectrum / v2 of the heavy quark hadron (separated) decay electrons

2) Compelling Physics

1) Establish elementary charm and bottom cross sections

2) Characterize the medium through parton energy loss

3) Determine the degree of thermalization via heavy quark flows

4) Analyze hadro-chemistry in the charm sector

5) Study the bottom behavior in medium via the separation of charm contributions

Compelling Physics with HFT


STAR HFT vs. PHENIX VTX


STAR Advantages

STAR advantages:

1) Low pT charm hadron spectrum / v2

- Thermalization, quantify medium properties: drag/difussion co-efficient2) High pT charm and electron (c,b separated) RAA

- Charm hadron RAA : the cleanest measurement - Electron channel in accessing bottom production: much better controlled systematic uncertainties benefiting from known charm spectra.


Total Charm/Bottom Cross Sections

NLO pQCD predictions of charm and bottom total cross sections per nuclear nuclear collisions.

Statistics estimated for charm cross section in p+p, Au+Au mb, Au+Au central at 200 and 500 GeV.

Statistics estimated for bottom cross section in Au+Au mb and central at 200 GeV.Systematic errors are estimated from D0 e pT shape uncertainties (open box).


PXL Risk Assessment, selected high risk examples

WBS # Description of Risk Mitigation1.2.1.1 Air cooling, new technology, high technical

riskEarly in the program carry out detailed cooling analysis, computational fluid dynamics (CFD), followed with tests using a full scale realistic prototype mock-up.

1.2.1.1 Air cooling, source of vibration, high technical risk

Early in the program carry out vibration and deformation measurements of the sector structure in the appropriate air flow stream

1.2.1.1 New sector/ladder support technology, high technical risk

Perform early FEA analysis of the structures and measure prototype structures as soon as possible to determine if the proposed design meets the requirements

1.2.2.1 Risk that aluminum cable fabrication leads to technical and schedule problems. (high risk)

Schedule float, visit vendor and work collaboratively and test production capabilities early

1.2.2.1 Risk of radiation damage to inner silicon layer. The expected yearly dose for maximum Au+ Au luminosity is 2*1011 to 1012 1 MeV n equiv/cm2 (NIEL). And 20 to 90 kRad ionizing radiation. This is comparable to tolerance levels of our detectors

Improve measurements of rad hardness and STAR radiation levels. Design for rapid replacement capability.


Prototyping Status – Sensor RDO Cables

Cable•4 step development process.•Al traces in low mass region.•Radiation Length ~ 0.073% (low mass region)•Al based cable meets X0 requirement.

Status• Defined signal paths• Schematic entry complete for preliminary FR-4 test version.

http://rnc.lbl.gov/hft/hardware/docs/Phase1/Development_PXL_flex_cable.doc

Develop flex PC readout cable (WBS 1.2.2.3)

Low mass Sensor regionDriver region

Side view (exaggerated vertical scale)

Preliminary Design: Hybrid Copper / Aluminum conductor flex cable

Low mass region calculated X0 for Al conductor = 0.073 %Low mass region calculated X0 for Cu conductor = 0.232 %


Parameters and Data Rates

PXL System

• Data rate to storage = 199 MB/sec (1kHz trigger)• 199kB / event• Meets data rate requirement.• Meets data volume requirement.

Item Number

Bits/address 20

Integration time (µs) 200

Luminosity (cm-2s-1) 8 × 1027

Hits / frame on Inner sensors (r=2.5 cm) 246

Hits / frame on Outer sensors (r=8.0 cm) 24

Final sensors (Inner ladders) 100

Final sensors (Outer ladders) 300

Event format overhead TBD

Average Pixels / Cluster 2.5

Average Trigger rate 1 kHz


Control milestones for each sub-system.

Level 1/2 Milestones

1.2 Receive Prototype sensors from IPHC Q2FY11Pixel Prototype Sector Design Complete Q4FY10Prototype Insertion mechanism Testing Complete Q2FY11Receive final Ultimate Sensors from IPHC Q1FY13Sector Assembly start Q1FY13PXL detector available for insertion Q3FY14

1.3 ISTSensor, Module and Ladder design Complete Q3FY10Prototype Modules tested Q1FY12First 3 modules produced Q3FY12Staves Finalized Q3FY13Installed on MSC, ready for installation in STAR Q1FY14

1.4 SSD Prototype Board Layout Review Q3FY10

Prototype Test on bench Q2FY11Final Design Complete Q4FY11Move Full System to STAR for test Q4FY12Ready for installation Q3FY13

1.5 Beam pipe qualification Q1FY11Beam pipe delivered and accepted at BNL Q4FY11Inner detector Support assembled with FGT Q1FY13Production OSC/MSC at BNL for integration Q2FY13Inner detector Support assembled with SSD/IST/FGT Q4FY14

1.6 SoftwareCalibration Model Developed Q2FY10Tracker/Vertex finders functional Q4FY11Reconstruction software finalized Q3FY12IST online and calibration software commissioned Q2FY13

HFT Preliminary Milestones


Cost by WBS estimated by the subsystem experts as a bottoms-up analysis for labor, material and contributed labor.

Developed high level schedule from engineering judgment, quotes, and sensor development timeline.

Currently refining schedule and cost into one resource loaded schedule using MS Project software.

Low range = cost + 0.5* contingency; high cost = cost + 1.35*contingency.

Preliminary Cost Estimate

1.1 Project Management 1002 9% 90 1047 1124

1.2 Pixel 4780 32% 1540 5550 6859

1.3 Intermediate Silicon Tracker (IST) 2650 36% 960 3130 3946

1.4 Silicon Strip Detector (SSD) 660 44% 290 805 10521.5 Integration 1380 43% 600 1680 2190

subtotal 10472 33% 3480 12212 15170Contributed Labor 2345 0 2345 2345

Total Project Cost 12817 3480 14557 17515

WBS Title CostContingency

$Low

rangeHigh

RangeContingency

%


Spin Program


Physics Run Plan

1) First run with HFT: Au+Au 200 GeV

a) v2 and Rcp of D-mesons with 500M minimum bias collisions

2) Second run with HFT: p+p 200 GeV

a) RAA of D-mesons

3) Third run with HFT: Au+Au 200 GeV high statistics

a) Systematic studies of v2 and RAA

) c baryon with sufficient statistics

c) Charm correlation / Electron pairs


The Inner vertex tracking upgrade was identified as a critical component soon after the start of RHIC and developed into proposal and R&D projects within STAR.

Reviewed by BNL Detector Advisory Committee in March 2005 and included in the RHIC detector upgrade mid-term plan.

Reviewed by BNL Technical Advisory Committee in January 2007 and proceeded with preparation of CD-0 proposal and submission

February 2008 CD-0 review Report received Jan 2009; CD-0 approval February 2009. March/April 2009 Research Management Plan and response to CD-0

report submitted to DOE.

November 2009 CD-1 review and CDR submission Report received soon after, preparing response to committee. Will be real construction project with CD-1 signed shortly. Working on preparation for CD-2/3.

Project History and Status


(Optimistic) Schedule

Completion aimed for run-14 with pixel detector available.- Require more funds in FY-11

CD-2/3 in fall 2010 Pixel prototype (3 sectors out of 10) and initial assembly with IDS

completed before Run-12 HFT Engineering run - RHIC Run - 12 Pixel detector available for RHIC Run - 14 (High luminosity AuAu run)

- Pixel + SSD + mechanical supportsFull HFT system installed for RHIC Run - 15

- IST


BNL Project management, integration, safety, SSD electronic upgrade

LBNL PXL detector, Global support, SSD, integration, Software

MIT IST detector

IPHC Sensor development

SUBATECH Engineering for SSD readout

UT Austin PXL readout.

Kent State, UCLA, Purdue, NPI, CTU Lead Software development

Collaboration and Responsibilities


Importance to RHIC Beam Energy Scan

One important task at RHIC top energy heavy ion programTest the system thermalization and quantify the degree

RHIC Beam Energy Scan (BES) programSearch for the 1st-order phase boundarySearch the critical point of QCD phase diagram

Thermalization is one assumption in proposed signatures.


Muons: Penetrating Probes

The initial temperature of sQGP; the mass origin of hadrons;

color screening features of heavy quarkonia … Measurements Physics

low mass di-muons thermal radiation of QGP;

in-medium modifications of vector meson ( ), chiral symmetry restoration

intermediate mass di-muons thermal radiation of QGP;

heavy flavor modification; resonances in sQGP

large mass: heavy quarkonia T of QGP, color screening, quarkonium production mechanism


Comments on Simulations

Simulations Conditions

Efficiency of single muon and J/ Include TPC tracking efficiency, MTD acceptance, matching between TPC and MTD

J/ and signal versus background

J/, RAA, v2 projection

µ-e correlations

Signal from STAR measurements;

Inclusive muons: reconstructed from prototype performance from Runs 7-8, track matching included, tof cut is not applied


High Mass Di-muon Capabilities

1. J/: S/B=6 in d+Au and S/B=2 in central Au+Au

2. With HFT, study BJ/ X; J/ using displaced vertices

3. Excellent mass resolution: separate different upsilon states

Heavy flavor collectivity and colorscreening, quarkonia production mechanisms:J/ RAA and v2; upsilon RAA …

Quarkonium dissociation temperatures – Digal, Karsch, Satz

Z. Xu, BNL LDRD 07-007; L. Ruan et al., Journal of Physics G: Nucl. Part. Phys. 36 (2009) 095001


The details for the R&D modules

Conditions Modules and readout

Cosmic ray and Fermi-lab T963 beam tests double stacks,

module size: 87(z)17() cm2,

Performance: 60 ps, ~0.6 cm at HV 6.3 kV

Run 7: Au+Au

Run 8: p+p, d+Au

double stacks, 2 modules in a tray, module size: 87(z)17() cm2,

Readout: trigger electronics,

Time resolution: 300 ps

Run 9: p+p

Run 10: Au+Au, cosmic ray

double stacks, 3 modules in a tray, module size: 87(z)17() cm2,

Readout: TOF electronics; trigger electronics for trigger purpose.

Run 11 single stack, 1 module in a tray, module size: 87(z)52() cm2,

Readout: TOF electronics; trigger electronics for trigger purpose,

Cosmic ray test performance: <100 ps


Trigger Capability with MTD Acceptance

RHIC II lumonisity in terms of collision rate: 40 k Hz; Au+Au projection: based on Run 10 prototype performance.

Run10 Au+Au

B. Huang, USTC

L0 trigger timing resolution (assumed)

di-muon trigger efficiency of the timing

cut

140 ps 3.6σ (100%)

200 ps 2.5σ (98%)

300 ps 1.7σ (80%)

1 ns trigger window: 80 Hz for dimuon trigger


Delivered luminosity: 2013 projected;Sampled luminosity: from STAR operation performance

Collision system

Delivered lumi.

12 weeks

Sampled lumi.

12 weeks (70%)

Υ counts Min. lumi.

precision on

Υ (3s) (10%)

Min. lumi.

precision on

Υ (2s+3s) (10%)

200 GeV p+p

200 pb-1 140 pb-1 390 420 pb-1 140 pb-1

500 GeV p+p

1200 pb-1 840 pb-1 6970 140 pb-1 50 pb-1

200 GeV Au+Au

22 nb-1 16 nb-1 1770 10 nb-1 3.8 nb-1

Upsilon Statistics


Organization

MTD group: Brookhaven National Laboratory: L. Ruan, Z. Xu, K. Asselta, W. Christie, C. D’Agostino, J.

Dunlop, J. Landgraf, T. Ljubicic, J. Scheblein, R. Soja, A.H. Tang, T. Ullrich University of California, Berkeley: H.J. Crawford, J. Engelage University of California, Davis: M. Calder′on de la Barca S′anchez, R. Reed, H.D. Liu Rice University: J. Butterworth, G. Eppley, F. Geurts, W.J. Llope, D. McDonald, T.

Nussbaum, J. Roberts, K. Xin, L. Bridges University of Science & Technology of China: H.F. Chen, B.C. Huang, C. Li,

M. Shao, Y.J. Sun, Z.B. Tang, X.L. Wang, Y.C. Xu, Z.P. Zhang, H. Zeng,

Y. Zhou Texas A&M University: Y. Mohammed, S. Mioduszewski University of Texas, Austin: A. Davila, G.W. Hoffmann, L. Li, C. Markert, L.

Ray, J. Schambach, D. Thein, M. Wada Tsinghua University: J.P. Chen, K.J. Kang, Y.J. Li, Y. Wang, X.L. Zhu Variable Energy Cyclotron Centre: Z. Ahammed, P.P. Bhaduri, S.

Chattopadhyay, A.K. Dubey, M.R. Dutt-Mazumdar, P. Ghosh, S.A. Khan,

S. Muhuri, B. Mohanty, T.K. Nayak, S. Pal, R. Singaraju, V. Singhal, P.

Tribedy, Y.P. Viyogi


Q4(FY09)

Q1-2(FY10)

Q3-4(FY10)

Q1-2(FY11)

Q3-4(FY11)

Q1-2(FY12)

Q3-4(FY12)

Q1-2(FY13)

Q3-4(FY13)

Q1 (FY14)

MRPC Module

Proposal Design

US MTD Constru.

Electronics

Tray

Install/Commission

Physics Data

MTD Schedule

Finish the project by Sep, 2013 and make the full system ready for year 2014 run

Design

Design

Design

Production

Production

Production