dØ report

15/11/2004 NIKHEF SAC, Sijbrand de Jong 1

DØ ReportDØ ReportNIKHEF SAC meetingNIKHEF SAC meeting 15/11/2004 15/11/2004

(report for internal use only)(report for internal use only)

Sijbrand de JongSijbrand de Jong

•Tevatron performanceTevatron performance•DØ hardware statusDØ hardware status•Physics with DØPhysics with DØ•Transition to ATLASTransition to ATLAS


Tevatron Past PerformanceTevatron Past Performance


Tevatron Future PerformanceTevatron Future Performance1.1. Electron beam cooling (being installed now,Electron beam cooling (being installed now,

commissioning next year)commissioning next year)2.2. Slip stacking at 10Slip stacking at 101212 p/pulse every 2 seconds p/pulse every 2 seconds3.3. Increase pbar production aperture by 25%Increase pbar production aperture by 25%4.4. Increase stacking rate at small stacksIncrease stacking rate at small stacks5.5. Mixed pbar operation, the recycler starts to pay-offMixed pbar operation, the recycler starts to pay-off

+ many small improvements+ many small improvements


Tevatron Performance futureTevatron Performance future


Tracking StatusTracking StatusOverall very stable over past year.Overall very stable over past year.Concerns:Concerns:1.1. 17% of SMT dead (~ random regions)17% of SMT dead (~ random regions)2.2. 1% channel loss in CFT (in VLPC cassettes)1% channel loss in CFT (in VLPC cassettes)3.3. Tracking software performance (pattern reco & speed)Tracking software performance (pattern reco & speed)Radiation damage expected for >5 fbRadiation damage expected for >5 fb-1-1

New L0 will coverNew L0 will cover(and even improve)(and even improve)

Inner circleInner circleis size ofis size ofgolfballgolfball

NIKHEF contribution toNIKHEF contribution toSMT construction andSMT construction andradiation monitoringradiation monitoring


Calorimetry and Muon System StatusCalorimetry and Muon System StatusIntermittent noise problems in calorimeter:Intermittent noise problems in calorimeter:•Hot patches, Rings of fireHot patches, Rings of fire•Noise hunt pays off:Noise hunt pays off:

Found whole bunch of dead-shorts Found whole bunch of dead-shorts (metal washers instead of G10)(metal washers instead of G10) First indications of reduced noise sensitivityFirst indications of reduced noise sensitivity

•Muon system performance efficientMuon system performance efficient and very stableand very stable

NIKHEF contribution to muon reconstructionNIKHEF contribution to muon reconstruction


Forward Proton DetectorForward Proton DetectorCommissioned and operated stand-aloneCommissioned and operated stand-aloneSoon to be operated routinely in DØ DAQSoon to be operated routinely in DØ DAQ

==p/pp/pdistributiondistribution

NIKHEF contributed Roman PotNIKHEF contributed Roman Potthin windows and castlesthin windows and castles


Trigger and DAQTrigger and DAQ

DAQ can handle bigger rates than foreseenDAQ can handle bigger rates than foreseen(after extensive work)(after extensive work)

Read-out dead time of SMT limiting 1Read-out dead time of SMT limiting 1stst level trigger level trigger

Trigger needs additional functionality to cope with Trigger needs additional functionality to cope with higherhigherLuminosity and to allow lower thresholds, e.g. on jetsLuminosity and to allow lower thresholds, e.g. on jets

Trigger upgrade is proceeding to planTrigger upgrade is proceeding to plan22ndnd level Silicon Track Trigger has been commissioned level Silicon Track Trigger has been commissioned

NIKHEF contribution to STTNIKHEF contribution to STT


Reconstruction & MCReconstruction & MC

Reconstruction improves continuouslyReconstruction improves continuouslyAll data has been reprocessed (with p14) to physics All data has been reprocessed (with p14) to physics qualityquality

(20% off-site)(20% off-site)All data will be reprocessed again (with p17) to All data will be reprocessed again (with p17) to improveimprove

physics qualityphysics quality (100% off-site)(100% off-site)

>10>1099 events to be processed events to be processedProcessing speed crucialProcessing speed crucial (need to improve (need to improve significantly)significantly)GRID usage essentialGRID usage essentialMC producing about 10MC producing about 1066 events per week (world-wide) events per week (world-wide)

(e.g. at (e.g. at NIKHEF fully gridifiedNIKHEF fully gridified))


DØ Data taking efficiencyDØ Data taking efficiency

Highest efficiency day had 2/3 NIKHEF DAQ sh

ifters

in charge

Highest efficiency day had 2/3 NIKHEF DAQ sh

ifters

in charge


QCD inclusive jet cross sectionQCD inclusive jet cross section


bb production mechanismsbb production mechanisms

Measured Pythia expectedMeasured Pythia expectedFCR (62±6±9) % (47±5) %FCR (62±6±9) % (47±5) %GSP (21±7±18) % (43±5) %GSP (21±7±18) % (43±5) %FEX (18±11±21) % (10±3) %FEX (18±11±21) % (10±3) %

Bram WijngaardenBram Wijngaardenthesis nearly finishedthesis nearly finished


EW ZEW Zll+ + ll - -

Tau: thesis Silke DuensingTau: thesis Silke Duensingwork continued by Cristina Galeawork continued by Cristina Galea

OS-SSOS-SS


EW WEW W ll

MMTT==ppeepp(1-cos(1-cosee))


W widthW width

WW=2.011=2.0110.0930.0930.107 GeV0.107 GeV PDG: 2.124PDG: 2.1240.041 GeV0.041 GeV


WW, ZW, WWW, ZW, W, Z, Zllll::(pp(ppWW)WW) = (14 = (14 4) pb4) pblll:lll: (pp(ppZW)ZW) < 15 pb< 15 pb

ll:: (pp(ppWW)) = (181 = (181 64) pb 64) pb

llll:: (pp(ppZZ)) = (116 = (116 17) pb 17) pb

All inAll in good agreementgood agreement with SMwith SM


ZZbbbbTrigger: L1:Trigger: L1: + jet(E + jet(ETT

towertower>5GeV)>5GeV) offline selection: 2 jets, Eoffline selection: 2 jets, ETT>15GeV, back-to-back>15GeV, back-to-backProblem with turn-on curve for jets !Problem with turn-on curve for jets !

Still working on this !Still working on this !

Axel NaumannAxel Naumannthesis in the worksthesis in the works

Not yet reliableNot yet reliable


new charm hadronnew charm hadron

XXJ/J/ ++--

mmXX=3872=38724 GeV4 GeV(Belle has 3872.0(Belle has 3872.00.8 GeV)0.8 GeV)

Width 17Width 173 MeV3 MeV


The bottom lineThe bottom line

bb)=(1.22)=(1.22+0.22+0.220.04) ps0.04) ps-0.18-0.18


BB00dd lifetime lifetime

2D-fit in mass and lifetime2D-fit in mass and lifetime

Background lifetime is massBackground lifetime is massDependent !Dependent !

SignalSignaltemplatetemplate

BackgroundBackgroundtemplatetemplate

Thesis ofThesis ofPaul BalmPaul Balm(defense(defense8 Dec 04)8 Dec 04)


BB00ss lifetime lifetime

(B(Bss)=1.444)=1.444+0.098+0.0980.020 ps0.020 ps-0.090-0.090

(B(Bss)/)/(B(B00)=0.980)=0.980+0.075+0.0750.0030.003-0.075-0.075


Excited bottom hadrons B**/BExcited bottom hadrons B**/BJJ

BB resonances resonances

mmB1B1=5724MeV=5724MeVmmB2*B2*=5748MeV=5748MeV


BBcc

J/J/ X final stateX final state

m(Bm(Bcc)=5.95)=5.950.37 GeV0.37 GeV

(B(Bcc)=0.45)=0.450.17 ps0.17 ps


BB00dd mixing mixing

BBss mixing in the works mixing in the works

Final state flavour: sign Final state flavour: sign in B in BD*D*XX

3 methods of initial state flavour tagging:3 methods of initial state flavour tagging:Opposite side soft muon:Opposite side soft muon:mmdd=0.506=0.5060.0550.0550.049 ps0.049 ps-1-1

Same side fragmentation pion:Same side fragmentation pion:mmdd=0.488=0.4880.0660.0660.044 ps0.044 ps-1-1

Comby of above two + same side jet charge:Comby of above two + same side jet charge:mmdd=0.456=0.4560.0340.0340.025 ps0.025 ps-1-1


tt tt l+ l++4 jets+4 jets

Single tag Double tagSingle tag Double tag

CSIPCSIP

SVTSVT

e channel ine channel inthesis ofthesis ofLukas PhafLukas Phaf(cum laude)(cum laude)


tt tt e e+2+2+bb+bb

S:N=70:1S:N=70:1


tt tt e e+2+2+2 jets event+2 jets event


tt tt 6 jets 6 jets

cutcut

cutcut

>= 1 SVT tag>= 1 SVT tag

Thesis of Freya BlekmanThesis of Freya Blekman(expected soon)(expected soon)


Top cross section and massTop cross section and mass

Biggest problem: jet energy scaleBiggest problem: jet energy scale


Single top productionSingle top production

Measured Br(tMeasured Br(tWb)/Br(tWb)/Br(tWq)=0.70Wq)=0.700.260.260.11 0.11 (SVT)(SVT)

CSIPCSIP+SLT+SLT

SVTSVT+SLT+SLT

Final state lFinal state lbb(single top)<23 pb (95%CL)(single top)<23 pb (95%CL)

BGBGestimationestimationsamplessamples

Theoretical work inTheoretical work inThesis Lukas PhafThesis Lukas Phaf


SM HiggsSM HiggsWH WH e ebb: H bb: H WW WW l lll::

Based on ~200 pbBased on ~200 pb-1-1: Luminosity increase : Luminosity increase 30 expected30 expectedCombine CDF and DØ: sensitivity Combine CDF and DØ: sensitivity 22Optimise detector calibration, trigger, analysis: Optimise detector calibration, trigger, analysis: ? ?More channels (e.g. H More channels (e.g. H ++--): ): ? ?


Doubly charged HiggsDoubly charged Higgs

HH++++HH-- -- ++++----


SUSY, neutralinosSUSY, neutralinos


SUSY, squarks and gluinosSUSY, squarks and gluinos

Signal prediction:Signal prediction:SUGRA mSUGRA m00=25GeV,=25GeV,AA00=0, tan=0, tan=3 =3 <0<0

squark/gluinosquark/gluinodecay intodecay intoquark/(qq pair) +quark/(qq pair) +neutralinoneutralino


(Large) Extra Dimensions(Large) Extra DimensionsLooking for Looking for (M (Mss>1.36 TeV) and>1.36 TeV) andee/ee/ (Ms>1.1 TeV) resonances (Ms>1.1 TeV) resonances(next slide)(next slide)

Jets+EJets+ETTmismis: M: Mss>0.7 TeV>0.7 TeV


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2

4

6

8

10

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NIKHEF participation in DØNIKHEF participation in DØ

staffstaff

PhD studentsPhD students Post-docsPost-docs

Jul 9

8Ju

l 99

Jul 0

0

Jul 0

4Ju

l 05

Jul 0

6Ju

l 07

Jul 0

8Ju

l 09

Jul 0

3

Jul 0

2

Jul 0

1

NOWNOW


Towards ATLASTowards ATLAS

GRID tests under realistic conditionsGRID tests under realistic conditionsNIKHEF plays very active role inNIKHEF plays very active role inDØ GRID deploymentDØ GRID deployment

Hadron collider physics analysis backgroundHadron collider physics analysis backgroundExperienced staff on ATLASExperienced staff on ATLAS

Creating interest in hadron collider physicsCreating interest in hadron collider physicsPositive atmosphere for ATLASPositive atmosphere for ATLAS


SummarySummary

•Tevatron luminosity looks promising (after slow start)Tevatron luminosity looks promising (after slow start)

•DØ is getting into shapeDØ is getting into shape•Calibration at physics paper level and improvingCalibration at physics paper level and improving•Ten’s of papers submitted this yearTen’s of papers submitted this year

•NIKHEF has significant contributionNIKHEF has significant contribution•High profile analyses:High profile analyses: bottombottom

toptoptautau

•Transfer of knowledge (GRID,…)Transfer of knowledge (GRID,…)and experience (people,…)and experience (people,…)

to ATLASto ATLAS


ConclusionConclusion

Up to you !Up to you !

dØ report

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