Status of CDFStatus of CDF

Robert Roser &

Jaco Konigsberg

October 20, 2006

2

Outline• Detector Operations• Offline Operations• High Luminosity Running • Physicist Resources• Streamlining• Physics

– B_s– Top Quark Mass– Higgs

• Conclusions

3

Publications

* Submitted+Accepted+Published thus far• We currently have ~50 papers under internal

review

Calendar Year

Publications

2003 4

2004 17

2005 44

2006 38*

Total to date 103

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Detector Operations at a Glance

• 653 pb-1 delivered in FY06, 82% to tape• ~5% trigger deadtime, ~5% beam conditions, ~5%

problems

2.0 fb-1 delivered

1.6 fb-1 to tape

5

Silicon Aging Like Fine (California) Wine

● powered● <1% error

92%

85%

Innermost layer of SVX

Silicon should operate well for the duration of Run II

• COT enjoying a breath of fresh air…

Central Outer TrackerCOT Gain vs. Time

Jan.2002 Aug.2005

Inner layer

Outer layer

7

Offline Operations• Computing will always require attention.

– Dealing with continually larger data sets and faster acquisition of data, and evolving technology

• Highlights of this years Successes include– Reduced operational load– Enhance GRID computing capabilities– Maintained 6 week turn around for data this past

year– Standard Ntuples now made in an automated fashion– MC production done off-site, code sped up 30-50%

• We are moving toward an incremental model– “once and done!”

8

Preparations for High Luminosity

• dE/dX turned off on COT for inner layers– No significant loss in particle ID expected

• XFT Trigger Upgrade– Level 1 commissioning complete– 97% efficiency, exceeded expectations

met fake rejection specs (3-5x)– Level 2 commissioning in progress

• Matching in 3D to other objects, finer resolution

• DAQ – building a bigger pipe!– event builder upgrade COMPLETE –

achieved >900hz at 200e30 (was 200 hz)– CSL – bandwidth increased from 20→80

Mb/sec

9

XFT upgrade project

•XFT originally only utilized axial layers

•Upgrade adds 3 stereo layers to 4 layer axial XFT system– better fake

rejection

– better resolution

10

fake reduction

fakes with old system

fakes with new

system

factor 7-8 reduction!

Phi

11

Triggering at High Luminosity

• Run at 2.3e32 thus far– identified 5 triggers out of 150 that are

misbehaving

• We have a plan for dealing with each one– XFT upgrade– Configuring additional Level 2 CDF electronics

to build a new calorimeter cluster finder

• Don’t see any significant obstacles to developing a trigger table for 3e32 for discovery datasets

12

Resources

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CDF Collaboration• 620 people

from 61 institutions and 13 countries

     France

LPNHE,Paris

14

Addressing our Staffing Needs

• We are taking the following steps– Maintaining our current resources– Understanding our needs– Aggressively recruiting new

resources– Streamlining Operations

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Understanding our Needs

Doing it for all subsystems & ops tasks

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Maintaining our Current Resources

• Keeping the experiment vital• Making data analysis accessible• Staying in constant touch with our

collaboration• Asking senior people to take

leadership roles

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Acquiring New Resources• New Fermilab International Fellowships to

bring in a post doc and an experienced senior person

• Working with funding agencies and universities to obtain supplemental monies where they can be most productive

• Use guest/visitors funds to fill critical needs• Three new Groups interested in participating

on CDF– New Institutions: Slovakia – Visitors: Greece, Mexico

18

Ph.D. Students Poll• Each institution sent:

– # of Ph.D. students to join CDF [for thesis]

• 45 responded (23 US & 22 non-US)

~ 2 yrs ago ~ 1 yr ago recently

0

10

20

30

40

50

60

1 2 3

~2 yrs ago ~1 yr ago recent

29 23 24 non-US

13 19 24 US

42 42 48 All

Counting from ~1yr ago we have 90 new students !

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Streamlining – The Point!

• Capturing Knowledge

• Getting to high quality data faster

• Freeing up resources for other tasks

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Doing more with Less• Detector Operations

– Reducing shift crew by one person• Reassigning tasks within crew• Increased automation• Improved training

– Remote Control Room in Italy• Replace one crew member on “local” owl shift

• Offline– Automating detector calibrations– Single point submission for MC– Extensive automation of production farms

• Physics– Automating various particle ID and trigger

efficiencies– Automating MC and data validation– Automating b-tag efficiency and fake rates– Automating Jet Energy Scale

21

Physics Results

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ICHEP - Moscow• 31 new 1 fb-1 results presented• Final conference summary talk

covered our top mass, B_s mixing, and higgs results.

•Bs mixing: semi-lept•Bs mixing: hadr•Bc->J/Psi pi•Lb lifetime•Chic x-sections•Orb. exc. B_s•etab->J/PsiJ/Psi•incl. Jet kt•incl. Jet cone•Kt distributions of particles in jets

• mtop l+jets• mtop dilepton• mtop hadronic• top x-sec hadronic• W helicity I, II • WH->lvbb• ZH->llbb• ZH->vvbb-

•Higgs combo•diphoton•ZZ•HT emu•Z pt spectrum•triphoton•diphoton+met•l+gamma+X•ttbar+gamma•monojet

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2006 Physics Highlights to Date

• B_s Mixing– Observation (9/25/06)

• http://www.fnal.gov/pub/presspass/press_releases/CDF_meson.html

– 3 Sigma Evidence (4/11/06)• http://www.fnal.gov/pub/presspass/press_releases/CDF_04-11-06.html

• First observation of B baryon Σb

– Press release in progress

• Worlds single best top mass measurement• New Higgs Limits

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Bs Oscillation: CDF 1 fb-1 April 2006

• Evidence:– 0.2% probability (> 3) random fluctuation

would look like a signal ms = 17.31 +0.33

-0.18 ± 0.07 ps-1

– |Vtd / Vts| = 0.208 +0.001-0.002 (expt.) +0.008

-0.006 (theo.)

PRL 97, 062003 (2006)hep-ex/0606027

Lab Press Release on April 11:Fermilab CDF scientists present a precision measurement of a subtle dance between matter and antimatter.

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Bs Oscillation: CDF 1 fb-1 Sept 2006

• Observation:– 8 x 10-8 probability (> 5) random fluctuation

would look like a signal– Effective statistics a factor of 2.5: Evidence

became Observation.

hep-ex/0609040

Lab Press Release on September 25:IT MIGHT BE… IT COULD BE… IT IS!!!Fermilab's CDF scientists make it official: They have discovered the quick-change behavior of the B-sub-s meson, which switches between matter and antimatter 3 trillion times a second.

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Bs Oscillation: CDF 1 fb-1 Sept 2006

• Observation:– 8 x 10-8 probability (> 5) random fluctuation

would look like a signal– Effective statistics a factor of 2.5: Evidence

became Observation.

hep-ex/0609040ms = 17.77 ± 0.10 ± 0.07 ps-1

|Vtd / Vts| = 0.2060 ± 0.0007 (expt.) ± 0.0081 (theo.)

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Top Quark Mass• Excellent results in

each channel

• Mtop (Combined)

= 170.9 ± 2.4 GeVMtop (stat.) = ± 1.4

GeV

Mtop (syst.) = ± 1.9 GeV

• Mtop determined to 1.4%

• With < 1 fb-1, we have surpassed Run IIa (2 fb-1) Goal!

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Postscript• Data makes us smarter…

– B_s observation was made with the identical data set we used in the “evidence” analysis

– Made use of more advanced analysis techniques including neural networks to separate signal from background…

– Used more difficult partial decay modes to effectively expand our dataset

• Top Mass is already better than our 2 fb-1 goal– A lot of work on jet energy scale – Better understanding of radiation– More sophisticated analysis techniques

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The Future of Top

• CDF Measu

rem

ents

will co

ntinue to

impro

ve

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The Neighborhood for Higgs

mtopTevatron = 171.4 ± 2.1 GeV!≈√

mW

(GeV)

mtop (GeV)

Indicates Higgs is light

(Mh < 166 GeV at 95% CL)

Where Tevatron sensitivity is best!

31

Search for Higgs…• Tevatron is already

within a factor of 3 in terms of sensitivity for SM Higgs at certain MH

• We are continuing to develop the tools needed to optimize this measurement

• We are optimizing our high luminosity trigger table for Higgs

~15 CDF + DØ Results combined.SM Sensitivity within a factor of5-10 for 110 < Mhiggs < 200 GeV

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Tracking Improvements

• Still improving the performance of our tracking algorithms

• Here we are making use of information in the “forward” direction to extend our tracking coverage

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B-tagging Improvements

• Utilizing a sophisticated neural network and information / techniques from existing CDF tagging algorithms

• Results in a 30% improvement in b-tagging efficiency for the same mistag rate

• Charm Rate under control

Mis

tag

rat

e

Tagging Efficiency

Standard secondary vertex b-tagging

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# of Physicists for Particle Discovery

Tevatron ~ 800

Year Discovered

Nu

mb

er

of

Ph

ysic

ists

LHC

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Summary• CDF is firing on all cylinders• Detectors and Offline Computing are

performing well• We have a plan for the “endgame” and

we are executing it• We are publishing our physics in a

timely fashion and have had several discoveries already this year

• We expect several more before 2007 and many more before we pass the torch of the energy frontier

36

BACKUP

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Signal-to-Noise ratioEmpirical model for S/N predictionslinear decrease in signalsqrt increase in noise

Benchmarks for S/NSVT predicted to start losing efficiency at S/N<8Run I: top quark discovery , S/N = 3 at the end of data taking

There is no evidence S/N won't be good enough until the end of Run II

38

B-tagging Improvements

• Utilizing a sophisticated neural network and information / techniques from existing CDF tagging algorithms

• Results in a 30% improvement in b-tagging efficiency for the same mistag rate

• Charm Rate under control

Mis

tag

rat

e (u

ds)

Positive tag rate (b jets)

Standard secondary vertex

b-tagging

Positive tag rate (b jets)

Po

siti

ve t

ag r

ate

(c

jets

)Standard

secondary vertex b-tagging

39

Search for Single TopSingle top is produced via weak

interaction at a rate ~1/3 that of top. Allows direct measurement of Vtb.

• Kinematically wedged between non-top and top signal, plus high backgrounds (S/B~1/20) require very sophisticated analysis techniques.

• Use l +MET+2jet (>=1 btag) events: same signature as

• s and t-channel searched jointly and separately (have different sensitivity to new physics).

s-channel production (W*)

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Single Top Limits(695 pb-1) has 2 analysis:1. Neural Network2. Multivariate Likelihood function

95% observed (expected) exclusion limit getting close to SM expectations!

Projections(ignoring syst):•2.4 s excess with 1 fb-1•3 s excess around 1.5 fb-1

Based on SM single top XS

Stat error only