# Presentation: 874116

## STATUS OF CDF

- Luciano Ristori

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## Detector Operations

- Big success of fall’04 shutdown installations
- CPR installed and working
- EM timing installed and working
- L2 Decision installed and working
- Accelerator recovery from shutdown was best ever
- CDF is taking data at high efficiency (~85%)

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## Upgrades

- CPR done
- EM Timing done
- L2 Decision Crate done
- SVT, XFT, EB, L3, TDC: tight schedule but in good shape

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## Offline

- New Offline Release
- We are getting close to the “final” version
- Progress on Infrastructure Upgrades
- Reconstruction Farm Upgrade
- CD review in December successful
- MC Production and Concatenation
- New scheme in testing
- Designed to exploit offsite computing
- Deploying distributed data-handling system (SAM) to enable all CDF computing to move to GRID

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## Integrated Lum to Date (FY05)

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## Peak Luminosity

**Recycler is already having a significant impact!**

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## Accelerator Performance

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## Data Taking Efficiency

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## Luminosity Delivered/Recorded

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## AD Projections (design)

- you are here

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## Run IIb Triggers and Physics Priorities

- Even with all upgrades, we cannot maintain an “all inclusive” trigger table for L>1.5E32
- We will be forced to sacrifice some fraction of our physics program at high luminosity
- Need to establish priorities based on physics goals
- RunIIb Physics Priorities and Triggers Committee

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## Main Concerns

- Running at high luminosity
- Shortage of human resources for detector and offline operations
- Discussed new MOUs with most institutions
- New rules for sharing the load?

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## STATUS OF ANALYSIS

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## Run II Publications

- 27 papers published or submitted
- 41 under Collaboration review

| year | 2001
First Collision
Commissioning | 2002
First Physics data | 2003 | 2004 | 2005
Goal |
| --- | --- | --- | --- | --- | --- |
| # of papers |  |  | 4 | 17 | 6 + 34 |

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## Recent Physics Results
Bs Mixing
Top Mass

- Bs Mixing
- Top Mass

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## CDF “Bs Mixing Group”

-  ~70 physicists (24 PhD students) in CDF are actively involved in the Bs mixing project
-  Improving the trigger strategy
-  Understanding the detector
-  B Lifetime Measurements
-  Flavor Tagging
-  B0 Mixing
-  Bs Mixing
-  18 CDF internal notes in past 3 months
-  ~1000 pages of documentation!
-   Hundreds of hours of meetings!

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## Hadronic Signal Reconstruction

-  In the hadronic channel, all the final state objects are reconstructed
-  Sharp Bs mass peak (~10 MeV)
-  Events in peak are high purity Bs signal
-  Lower sideband events:
-  BsD*s (Ds*Dsx): “satellite”
-  Potentially usable for analysis
-  Use 3 different Ds decays
-  Ds  , K*K, and 
-  Selection cuts for each channel are optimized in terms of S/√(S+B)

- 526±33 events

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## Hadronic  Bs Signals

- 254±21 events

- 116±18 events

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## Semileptonic Signal Reconstruction

-  In the Semileptonic channel, there is missing energy
-  Cannot see Bs mass peak
-  Use Ds mass peak and charge correlation between lepton and Ds
-  l+ Ds- :“Right-sign” = signal
-  l+ Ds+:“Wrong-sign” = background
-   Use 3 different Ds decays
-  Ds  , K*K, and 
-  Selection cuts for each channel are optimized in terms of S/√(S+B)

**D****-**********

**D****s****-**********

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## Semileptonic Bs Signals

- 1573±88 events

- 1750±83 events

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## Amplitude Scan for B0

- Introduce “Amplitude” in Likelihood
-  Amplitude will be consistent with
-  1 if there is mixing
-  0 if there is no mixing
-  Amplitude scan
-  Fit the amplitude for fixed m
-  Amplitude: A, uncertainty: A
-  Repeat the fit with different m
-  Example for B0 Hadronic sample
-  Amplitude = 1 at m = 0.5 ps-1
-  Amplitude = 0 at m >> 0.5 ps-1

- Hadronic B0 sample

- Hadronic B0 sample

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## Bs Mixing: CDF Combined Result

-  Hadronic Channel
-  Sensitivity = 0.4 ps-1
-  No Limit

-  Semileptonic + Hadronic
-  Sensitivity: 7.4  8.4 ps-1
-  Limit: 7.7  7.9 ps-1

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## Future Prospects

-  The result shown today is just the first round of the analysis
-  Run II CDF will continue through 2009
-  Long term goal: Observation of the Bs mixing
-  Possible improvements
-  More Luminosity
-  Improve Trigger strategy
-  For high luminosity environment
-  Improve the Flavor tagging
-  Same side tagging
-  expect substantial improvement in D2
-  Improve the vertex resolution
-  More important for larger ms
-  Include of more decay channels
-  Reduce systematic uncertainty:
-  For 5 observation, A< 0.2
-  Hadronic: Better calibration of flavor tagging
-  Semileptonic: Better understanding of the background

- Amplitude scan to
- Hadronic B0 sample
-  (~x10 more than Bs)

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## New CDF Result on Top Mass in Lepton+Jets channel with 318pb-1

- New CDF Result on Top Mass in Lepton+Jets channel with 318pb-1

- Analysis Information:
- http://www-cdf.fnal.gov/physics/new/top/top.html#MASS

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## Production of the Top quark at the Tevatron

- Top quarks are primarily produced in pairs  (~7pb),
- via qq  (85%) and gg(15%),  - LHC via gg (90%)
- top ~ 4 x 10 -25 s (due to large mass)
- Top decays as free quark  (-1 ~ (200MeV) -1 ~10 -23 s)

- Dilepton (5%, small background)
- 	2 high-PT leptons(e/), 2 b jets,                          large missing ET
- Lepton+Jet (30%, manageable bkgrnd)
- 	1 high-PT lepton(e/),  4 jets (2 b jets),                large missing ET(30%)
- All-hadronic (44%, large background)
- 	6 jets (44%)

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

**Notes:**
Top Production:	 

Primarily in pairs by the strong interaction
cm energy      qqbar  gg
1.80 GeV        90%    10%
1.96 GeV        85%    15%
   GeV           5%    95%

Singly by the ewk interaction.

Top Decay
At the Tevatron, top quarks are primarily produced in pairs.
In the SM, assuming V-A coupling with a CKM mixing parameter |Vtb| = 1
 for the tbW decay vertex, one gets (LO) : 
(tbW ) ~ 175 MeV (Mtop/MW)3   , (Mtop ; MW >>Mb ), (t  bW ) ~ 1.5 GeV
top ~ 4 x 10 -25 sec
Non-perturbative QCD hadronization takes place in a time of order:
-1 ~ (100MeV) -1 ~10 -23 sec
Top decays as free quark! (no hadrons, no toponium spectroscopy)
Top quark remebers it’s spin
BR(tWb) @  100 %
tWs and tWd allowed but suppressed by ~10-3 and ~5x10-5.

General ttbar Event Characteristics:
Charge lepton (e,) from W decay
 High Pt   (>20 GeV/c)
 Neutrino gives missing energy
  Jets are energetic  (Et > 15 GeV)
  Rely heavily on tagging the b-quarks
 Soft Lepton Tag (b      l  c)
 Secondary VexteX Tag
3 Classes of signal
Dilepton Very small backgrounds, but very small cross section, low acceptance
	s/b ~ 9/1
(2)  Lepton + Jets Good cross section and manageable backgrounds
(3)  All Jets Huge QCD Background

## W+heavy flavor jets(bb,cc,c)
Heavy flavor fraction from MC
Normalized to data
W+jets(mistag)
Use measured mistag rate, applied to the data
Multijet:fake-W (jet->e, track->)
Estimated from data
Single top, dibson (WW,WZ)
Estimated from MC

- Heavy flavor fraction from MC
- Normalized to data
- W+jets(mistag)
- Use measured mistag rate, applied to the data
- Multijet:fake-W (jet->e, track->)
- Estimated from data
- Single top, dibson (WW,WZ)
- Estimated from MC

- Backgrounds

|  | 2tag | 1tagT | 1tagL | 0tag |
| --- | --- | --- | --- | --- |
| bkgds | 0.7+-0.2 | 7.6+-1.2 | 10.2+-1.7 | no est |
| Data | 16 | 57 | 25 | 40 |

- >=1-btag

- control

- signal

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005

## Results on the Mtop  from the 2-D Fit

**Comb. –Log Likelihood**

**Expected  error**

- Incontro con i Referee - Status of CDF -  Luciano Ristori

- 22 Aprile 2005