# Presentation: 881938

## Status of CDF

**Robert Roser ****& ****Jaco Konigsberg**

***October 20, 2006***

## Outline

- Detector Operations
- Offline Operations
- High Luminosity Running
- Physicist Resources
- Streamlining
- Physics
- B_s
- Top Quark Mass
- Higgs
- Conclusions

## 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 |

## 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**

## 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**

## Central Outer Tracker

## 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!”

## 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 expectationsmet 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

## 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

## fake reduction

- fakes with old system

- fakes with new system

- factor 7-8 reduction!

**Phi**

## 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

## Resources

## CDF Collaboration

- 620 people from 61 institutions and 13 countries

**    ****   ****France**_[LPNHE](http://www-lpnhep.in2p3.fr/)_**,Paris**

## Addressing our Staffing Needs

- We are taking the following steps
- Maintaining our current resources
- Understanding our needs
- Aggressively recruiting new resources
- Streamlining Operations

## Understanding our Needs

- Doing it for all subsystems &  ops tasks

## 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

## 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

## 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

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

## Streamlining – The Point!

- Capturing Knowledge
- Getting to high quality data faster
- Freeing up resources for other tasks

## 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

## Physics Results

## 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**

## 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](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

## Bs Oscillation: CDF 1 fb-1 April 2006 

- 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.

## 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.

**Notes:**
Improvements:
Flavor tagging
opposite side kaon tagging
NN to opposite, same side tagging
Signal yields
Partially reconstructed decay modes
Added trigger path in lepton+Ds
NN for hadronic selection
Particle id in selection

## 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

- ms = 17.77 ± 0.10 ± 0.07 ps-1
- |Vtd / Vts| = 0.2060 ± 0.0007 (expt.) ± 0.0081 (theo.)

**Notes:**
Improvements:
Flavor tagging
opposite side kaon tagging
NN to opposite, same side tagging
Signal yields
Partially reconstructed decay modes
Added trigger path in lepton+Ds
NN for hadronic selection
Particle id in selection

## Top Quark Mass

- Excellent results in each channel
- Mtop  (Combined)      = 170.9 ± 2.4 GeV
- Mtop (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!

## 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

## The Future of Top

***CDF  Measurements will continue to improve***

## 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!

## 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 of
- 5-10 for 110 < Mhiggs < 200 GeV

## 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

## 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

## # of Physicists for Particle Discovery

## 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

## BACKUP

## Signal-to-Noise ratio

- Empirical model for S/N predictions
*linear decrease in signal*
*sqrt increase in noise*
- Benchmarks for S/N
*SVT predicted to start losing    efficiency at S/N<8*
*Run 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 **

## 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

## Search for Single Top

- Single 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*)*

## Single Top Limits

- (695 pb-1) has 2 analysis:
- Neural Network
- 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**