star run 16 report - brookhaven national laboratory run 16 report david tlusty ... the ssd will...

STAR RUN 16 REPORT

DAVID TLUSTY (RICE UNIVERSITY) FOR THE STAR COLLABORATION

1

David Tlusty RHIC & AGS Annual Users’ Meeting

OUTLINE

Beam User Request (BUR) for Run 16 and PAC recommendation ➡ Run 16 is predominantly last run of Heavy Flavor (HF) program and

continuation of Run 14

Detector Upgrades and Improvements

Detector performance

Run Performance

Summary

2


DONEC QUIS NUNC

THE STAR DETECTOR IN THE RUN

FMS/FPS Roman Pots

IST

PXL

SSD

TPC MTD Magnet BEMC BBC EEMC TOF

Heavy Flavor Tracker

3

VPD

MTD

HFT

SSD

IST

PXL


BEAM USE REQUEST FOR RUN 16BUR 16+17

PAC Recommendations

4

Energy Duration System Goals Priority Seqence

√sNN=200 GeV 13-wk Au+Au Heavy Flavor 1 1

√sNN=62 GeV 13-wk Au+Au Gamma jet 4 2

√sNN=19.6 GeV 13-wk d+Au BES 4 3

Energy Duration System Goals Priority Seqence

√sNN=200 GeV 10-wk Au+Au Heavy Flavor 1 1

√sNN=200 GeV 1-wk d+Au BES 4 2

√sNN=62.4 GeV 1-wk d+Au BES 4 3

√sNN=19.6 GeV 1.5-wk d+Au BES 4 4

√sNN=39 GeV 1-wk d+Au BES 4 5


HEAVY FLAVOR HADRONS PROGRAM (HFT)Carry out systematic measurements of HF hadrons (D mesons, Λc, B0) ➡ 1.2B Minimum Bias (MB) events collected in Run14 ➡ Need another 2B MB + 250M central events in Run 16 for

Rcp(Λc)/Rcp(D0) measurement

5

Discussion #2: Compare With Models

STAR Preliminary

(GeV/c)T

p0 2 4 6 8

AAR

0

0.5

1

1.5

2

p+p uncert.

@ 200 GeV 0-10%0 D→Au+Au

20140D 2010/110D

DUKETAMUSUBATECH

D0 RAA Compare With Models

STAR Preliminary


HEAVY FLAVOR HADRONS PROGRAM (HFT)➡ pointing resolution improved (Cu ➔ Al flex cables

for PXL, material budget 0.52%X0 ➔ 0.37%X0 )

➡ Including SSD should improve the tracking efficiency by ~15%

6

40

4 Run 16 Request

4.1 Au+Au √sNN= 200 GeV 4.1.1 D0 and Λc request Au+Au √sNN= 200 GeV

In Run16, we request a long Au+Au 200 GeV run to carry out the systematic measurements of

heavy flavor hadrons with HFT and MTD. In particular, we are aiming for measurements of /c baryon and bottom hadrons through J/Ψ as well as semi-leptonic decay channels. We request a Au+Au 200 GeV run to collect 2B minimum bias “good” events and > 1 nb-1 sampled luminosity with EMC HT and di-muon triggers within the HFT acceptance (|Vz|<6cm) to perform these measurements.

The HFT-PXL detector planned for Run16 will be equipped with the Aluminum (Al) cable for inner ladders, as the case for run-15, while in Run14, most inner ladders were using Copper (Cu) cables. The material budget for an Al-cable ladder is about 0.37%X0 compared to 0.52%X0 for a Cu-cable ladder. This will significantly reduce the contribution from multiple coulomb scatterings to the pointing resolution, especially for low momentum particles, and thus improve the significance of reconstructed D0 mesons at low pT. Figure 4-1 shows the significance ratio between the Al-cable and Cu-cable ladders for D0 mesons as a function of pT. The improvement in the significant is about a factor of 1.6 for 1 GeV/c D0 mesons. In other words, the Figure-Of-Merit (FOM) statistics improvement with the same number of events in Run16 will be a factor of 2.5 for 1 GeV D0 mesons.

Figure 4-1 The ratio of D0 meson significances between the Al-cable ladder (thin) and the Cu-cable ladder (thick) as a function of D0 pT from simulation

In addition, in Run16, we expect to have the SSD subsystem to participate in the data taking for

the full 200 GeV run period as was done for the Run15, while we don’t have the SSD in the major HFT data collected in the current Run14. The SSD will improve the track matching and reduce the ghosting rate for the TPC tracks associating with the PXL hits. The improvement is about 10% for the single track efficiency with the additional SSD layer, thus effectively 20% in the D0-mesons reconstructed with two charged tracks.

We request to collect 2B minimum bias “good” events in Run16. The effective FOM increase considering the above detector configuration improvement is about a factor of 6 for low pT D0 when

7

STAR HFT PXL Detector Design

Carbon fibre sector tubes (~200µm thick)

MAPSRDObuffers/drivers

4-layer kapton cable with aluminium tracesAluminum conductor Ladder Flex Cable

Ladder with 10 MAPS sensors (~ 2×2 cm each)

20 cm

The 2013 International Conference on Applications of Nuclear Techniques Crete, Greece June 23-29, 2013

η coverage +-1 Inner layer Outer layer

2.5 cm radius

8 cm radius End view

23

Figure 2-23 J correlation of /-p (same baryon number) and /-Cp (opposite baryon number) vs centrality in Au+Au collisions at 200 GeV [43].

2.4 Progress on tracking with the Heavy Flavor Tracker

During the run-14 the HFT was fully commissioned in the Au-Au run. In particular both the PXL and the IST detector subsystems were included in all of the physics runs for 200 GeV Au+Au. As part of the close-out of the HFT project preliminary tracking was utilized to demonstrate that the performance of the HFT detector met the project goals. This is shown in the figures below, Figure 2-24 shows that the efficiency for tracking with IST and PXL alone reached 65%, while Figure 2-25 shows that the production tracking software results in excellent pointing resolution for the two ladders that were Al-based ladder cables. For the detectors as a whole better than 50 microns was achieved.

Figure 2-24: Tracking efficiency for pion in full simulation vs. pT for full HFT (red) and PXL+IST only

Ref: RHIC BUR 16,17

Ref: RHIC BUR 16,17


HFT PERFORMANCE

7

Average active sensors in Run16: PXL inner – 95% (vs. 82% in Run14) IST – 97% (vs. 95% in Run14) SSD - fully included (vs. in 15% data in Run14)


HFT PRELIMINARY PERFORMANCE (RUN 16)With preliminary calibrations, Run16 HFT matching and DCA resolution show a comparable or slightly better performance w.r.t Run14 ➡ different luminosity level ➡ different trigger setup for pileup protection

8

hHFTDcaXy2_DataOff_5_2

Entries 1339441

Mean 0.0007305

RMS 0.02999

dcaXY (cm)0.2− 0.15− 0.1− 0.05− 0 0.05 0.1 0.15 0.2

3−10

2−10

1−10

hHFTDcaXy2_DataOff_5_2Entries 1339441

Mean 0.0007305

RMS 0.02999

/ ndf 2χ 0.001085 / 5

#N0 0.002345± 0.002041

0 µ 0.0059415± 0.0002683

0 σ 0.005802± 0.004758

hHFTDcaXy2_DataFix_5_2

Entries 997163

Mean 0.001729

RMS 0.03505

/ ndf 2χ 0.001048 / 5

#N2 0.002254± 0.001913

2 µ 03− 5.891e±05 −2.962e−

2 σ 0.005638± 0.004631

Kaon 0.60<pT<0.80 GeV, 0-80%Run14Run16Dca |0.01|/|1.0| RatioRun14= 0.79Run16= 0.74


HEAVY FLAVOR HADRONS PROGRAM (MTD)J/𝜓 RAA,v2

Υ suppression

Di-muon, e-μ correlations

11 nb−1 collected in Run 14

20 nb−1 goal in Run 14+16

Run 14 data already produced (took 9 months!)

9

Run16 goal for MTD •  Motivation: continue to accumulate statistics for

quarkonium measurements, especially for Upsilon and Jpsi v2

•  Goal: 10 nb-1 of effective luminosity –  ~10/0.8 nb-1 of sampled luminosity

(GeV/c)T

p0 1 2 3 4 5 6 7 8 9

AA

R

0.2

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0.8

1

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Au+Au @ 200 GeV 0-20%

, |y| < 0.5-µ+µ→ψJ/Error for published pp reference: stat+sys

, Au+Au stat+sys error)-1QM2015 (0.3*10nb, Au+Au stat error)-1Run14+Run16 (2*10nb

(Au+Au stat+sys error)-e+e→ψPublication J/

Collision System

(1S)

ϒ(2

S+3S

)/ϒ

-210

-110

1

10

p+p (world-wide)CMS [email protected] TeV (0-100%)STAR Au+Au@200 GeV (ee) (0-80%)

) (0-80%)µµSTAR Au+Au@200 GeV ( Run14+16 projectionµµ→ΥSTAR

STAR preliminary

01/29/2016 R. Ma, Collab meeting, BNL 14

Run14 AuAu: Upsilon analysis

01/29/2016 R. Ma, Collab meeting, BNL 12

)2(GeV/cµµM8 8.5 9 9.5 10 10.5 11 11.5 12

Cou

nts

-20

-10

0

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40-1 ~ 3.8 nbLAu+Au @ 200 GeV , |y| < 0.5-µ+µ→Υ

UL-LSCombined fit

(1S)Υ(2S)Υ(3S)Υ

bDrell-Yan+b/NDF = 22.6/172χ

STAR preliminary

QM’15 Now

•  Use fit to like-sign as background " reduce stat. error by √2 •  Investigate upward fluctuations

# Sequential suppression ! probe temperature of QGP

50 ± 22


HEAVY FLAVOR HADRONS PROGRAM (MTD)MTD trigger in HLT ➡ Reject events triggered by background ➡ Select a small quarkonium-rich sample

Matching algorithm improved, ε = 40%(Run 14) ➔ 90%

10

Efficiency&vs&M&

4&

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Efficiency of HLT triggers (p

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)2 (GeV/cµµM0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 50

20

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OfflineHLT-dimuon triggeredHLT-quarkonium triggered

> 0)µµT,

Invariant mass distribution of unlike-sign muon pairs (p

•  HLTKdimuon:&ε&>&90%&in&the&full&mass&range&•  HLTKquarkonium:&ε&>&80%&for&M&>&3&GeV/c2&which&is&

consistent&with&design.&The&steep&drop&at&low&mass&region&is&due&to&the&invariant&mass&cut&in&HLT.&


OTHER PROGRAMS

Gamma-jet for Au+Au at √sNN = 200 GeV ➡ parton energy loss in the

medium

dAu Beam Energy Scan ➡ CNM effects

Ultra-peripheral collisions ➡ photo-nuclear interactions

11

28

Figure 2-30. The RCP of charged hadrons for all BES energies, including the new 14.5 GeV data.

Several QGP signatures have been shown to disappear in the lower energies of the BES range.

Results for the RCP of hadrons show that the high pT suppression disappears at the lower energies. As shown in Figure 2-30, the new results are available at 14.5 GeV and are consistent with the trends of the other energies. These new results will be included in paper, which is currently in preparation, covering all the BES energies. The elliptic flow of the phi meson is possibly inconsistent with that of other particles at 11.5 GeV. Performance data for the phi analysis are shown in the left panel of Figure 2-31. Preliminary results from 14.5 GeV show the flow of the phi meson to exhibit the constituent quark scaling. New results for the asymmetry between the flow of particles and anti-particles are now available for the 14.5 GeV data. These data are consistent with the trends of the other energies. These new flow results will be included in a long BES elliptic flow paper, which is in preparation. Flow measurements are also available for other identified hadrons. The yields of strange particles are expected to be enhanced in a QGP. In order to study this strangeness enhancement, the pT spectra and yields of strange hadrons (K+, K-, K0

S, I��/��;, and :) have been measured. Performance data for the :+ baryon are shown in the right panel of Figure 2-31. These strange hadron yields are then compared to the spectra and yields for the S+, S-, p, and p ̅. Combining these spectra results allows one to determine the T and PB of chemical freeze out and the strangeness enhancement. The new 14.5 GeV results will be included in papers that address the other BES energies and are currently in collaboration review.

STAR Preliminary


TIME SCHEDULE AND LUMINOSITY

12

• Cool down to 4.5K starts on January 19th.

• Physics Running Declared on Sunday February 7th.

• Physics Running halted by Diode at 7 am on Friday March 18th

• ~ 5 5/7’s weeks• Physics running restarted on

Wednesday evening, April 6th.• Gap of ~ 19.5 days• Original “10 wks” of AuAu physics

running would have been concluded on Sunday April 17th.

• If one adds 19.5 days to this original end date, one land on Saturday May 7th.

• Without any extension, the Cryo warm up completes on June 7th.

• Shown in Magenta is where the CeCrunning would fall with A TWO WEEK EXTENSION.

• Original date for the start of the Cryowarm up was Friday, June 3rd.

• 20 Cryo weeks total.

The CalendarAu+Au 200 GeV

d+Au 200 GeV

d+Au 62.4 GeV

d+Au 19.6 GeV

d+Au 39 GeV

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d+Au 200 GeV

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d+Au 39 GeV


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d+Au 200 GeV

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d+Au 19.6 GeV

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SampledAu+Au 200 GeVd+Au 200 GeVd+Au 62.4 GeVd+Au 19.6 GeV


TRIGGERS FOR AU+AU AT √SNN = 200 G𝐞VChallenging goals in Run 16

Designed to maximize the bandwidth

Projections assume running 13.5 hour/day on average

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Trigger Goal Rate(ZDC @50 kHz) ps Projection

MB 2B events 700 n 2.38B × 0.85

Central 250M 80 n 270M × 0.85

Dimuon 10 nb−1 670 1 14 nb−1 × 0.7

High-pT 10 nb−1 33 1 14 nb−1

UPC 10 nb−1 27 1 14 nb−1


TRIGGER BANDWIDTH IN AU+AU AT √SNN = 200 G𝐞V

14

Corrected Rate at Plateau : ~55 kHzRaw ZDC Coincidence Rate

Raw VPD Coincidence Rate


TRIGGER BANDWIDTH IN AU+AU AT √SNN = 200 G𝐞V

14

Other HFT

Base / 40

1 2 3 4 5 6 7 8

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Hours

kHz1.8

1.0

0.5


MINIMUM BIAS TRIGGER PURITYDue to HFT acceptance only events within |Vz| < 6 cm are being analysed using HFT

Improvements to the online selection with the Vertex Position Detector significantly increased the MB trigger purity ➡ Jitter reduced using

pulser signals ➡ Earliest TAC ➔ average

of TACs ➡ MB Trigger Purity

increased from ~73% (Run 14) to 85%

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gRefMult dependence$

deltaVz_grefmult_Avg_wo_Jitter_2

Entries 59Mean 27.42Std Dev 18.09

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Entries 59Mean 27.42Std Dev 18.09

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10deltaVz_grefmult_Avg_wo_Jitter

Entries 234060Mean x 22.27Mean y 0.6805Std Dev x 11.42Std Dev y 2.005

deltaVz_grefmult_Avg_wo_Jitter

Entries 234060Mean x 22.27Mean y 0.6805Std Dev x 11.42Std Dev y 2.005

Average - Jitter

Test(DiMuon (trgId =(11)


AU+AU AT √SNN = 200 G𝐞V PERFORMANCEVery smooth operations

Average DAQ dead time 20%(Dimuon)

optimized balance of triggers

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Operation Efficiency •  Smooth operations •  HFT & dimuon triggers

were running without prescale

5/10/16 4 Mon May 9 09:57:56 2016 Day

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AU+AU AT √SNN = 200 G𝐞V PERFORMANCE

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Au+Au 200 GeV Sampled Luminosity •  a

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Upload of Run 14 HFT RDO firmware ➡ Run 15 firmware caused drop in the matching ratio of tracks with at least 3 HFT hits and TPC tracks

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Upload of Run 14 HFT RDO firmware ➡ Run 15 firmware caused drop in the matching ratio of tracks with at least 3 HFT hits and TPC tracks

New VPD trigger algorithm implemented 17


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𝗱+AU AT √SNN = 200 G𝐞V PERFORMANCE

280M MB events collected ➡ Will be useful to do the job of Run 15 p+Au dataset

18

MB


SUMMARYRun 16 concludes STAR Heavy Flavor Program

Major upgrades and improvements ➡ PXL material budget reduction ➡ MTD in HLT trigger performance ➡ MB trigger purity improvement

We are on good path to reach >90% of our main goals ➡ expect last week to switch back to Au+Au at √sNN=200 GeV

STAR looks forward to analyzing these data and soon present its results

Stay tuned

19

THANK YOU C-AD

20

star run 16 report - brookhaven national laboratory run 16 report david tlusty ... the ssd will...

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