A. Clark 1

CDF - highlights and perspectives

Operating well:

- rich physics program with ongoing results at highest operating collision energies (√s=1.96 GeV)

- silicon cooling problems being addressed (9-week shutdown from August 6th.

- data taking foreseen until 2009 - 6-7 fb-1 expected

DPNC Cartigny 14.09.2007

A. Clark 2

CDF Institutions

     Slovakia

Slovak AcademyComenius Univ

62 institutions14 countries

University of Geneva

Allan ClarkTill Hoffmann (MSc)Anna Sfyrla (thesis)Sofia Vallecorsa (thesis)Xin Wu

Until recently:

Mario CampanelliRégis LefevreShulamit Moed (thesis)

A. Clark 3

CDF Run II Publications

Year Publications

2003 4

2004 17

2005 44

2006 45

2007 30*

Total 140

* To date

From Lepton-Photon 2007

Recent (Summer 2007) results include:QCD and jet physicsHeavy flavor results (c- and b-quark)Top quark resultsHiggsNew physics searches

Comment on a small selection

- a few general-Geneva group

A. Clark 4

CDF Run II - Integrated Luminosity

http://www-cdfonline.fnal.gov/ops/opshelp/stores/

Peak initial luminosity 2.92x1032 cm-2 s-1

CDF to tape 3.4 fb-1 delivered

2.7 fb-1 to tape

- Increased luminosity entails increased analysis complication- key to increased integrated luminosity is lifetime and reliability

- expect 6-7 fb-1 by end of run period?

A. Clark 5

Highlights of CDF Run II - QCD and inclusive JET cross-section

Di-jet production

Inclusive jet production

• central jets sensitive to new physics at high Q2

• forward jets at same Q2, lower x, sensitivity to PDF’s

• a key ingredient in understanding SM processes as background to new physics

A. Clark 6

Highlights of CDF Run II - Z/W + jets production

Z+ jets production (1.7 fb-1)

W+jets production (320 pb-1)

Z+b-jet production (1.5 fb-1)

Test of pQCD at high Q2

Key background to new physics processes (e.g. Z()+jets background to SUSY search in ET+jets channel

A. Clark 7

Highlights of CDF Run II - Bs

In SM Bs is suppressed (need FCNC)

SM predicts

SUSY can enhance BR by > order of magnitude

€

BR(BS

→ μ +μ − ) < 5.8 x 10−8 (95% CL)BR(B

d→ μ +μ − ) <1.8 x 10−8 (95% CL)

€

BR(BS

→ μ +μ − ) = 3.5 x 10−9

Result: L ~ 2fb-1

No excess seen

A key early measurement for LHC

A. Clark 8

Highlights of CDF Run II - Bs

Neural net analysis expoiting good Bs and Bd mass resolution

3 events in Bs window, 6 in Bd window

A. Clark 9

Highlights of CDF Run II - diboson production (non - Geneva)

•WZ production. 1st. Observation Oct. 2006 (WZ -> 3 lepton+ missing ET.

•Updated to 1.9 fb-1

€

σ (exp) = 4.3−1.0

+1.3 (stat) ± 0.2(sys) ± 0.3(lum) pbσ (NLO) = 3.7 ± 0.3 pb

Trilinear gauge couplings

1st. measurement

•ZZ production. 1st. Evidence

(ZZ->ll and ZZ->llll (~1.5 fb-

1)

€

σ (ZZ) = 0.75−0.54

+0.71 pbσ th =1.4 ± 0.1pb

A. Clark 10

Highlights of CDF Run II - triple gauge couplings (non - Geneva)

€

SM at tree level : g1

Z = kZ =1,λ Z = 0

Key background to new physics processes (e.g. Z()+jets background to SUSY search in ET+jets channel

A. Clark 11

CDF Run II highlights - WW/WZ semileptonic search (A. Sfyrla)

e± or µ±

A. Clark 12

CDF Run II highlights - WW/WZ semileptonic search (A. Sfyrla)

PRELI

MIN

AR

YBackground subtracted

Blind analysis

Integrated luminosity ~1.21 fb-1

Central µ± and e± for semileptonic W±

60<mJJ<100 GeV signal region (80% of the expected W signal)

Good agreement between µ± and e±

analyses

Expected significance using present data sample of ~2.5σ

Expected # events ~15900Measured # events = 15016

Measured # signal events = 410±212Measured significance = 1.94σ

S x BR (exp) = 1.49 ± 0.77 pbS x BR (th) = 2.1 ± 0.2 pb

A. Clark 13

Highlights of CDF Run II - t-quark mass (and W-mass)

From wine & cheese, 10 August 2007

A. Clark 14

Highlights of CDF Run II - SM Higgs boson expectation mW vs. Mt

Perspective:

€

δ mW

mW

~ 0.025

80.4 → ~

0.016 - 0.020

80.4

δ m t

m t

~ 1.8

170.9 → ~

1.0 -1.2

170.9

Today:

€

mH (preferred ) = 76−24

+33GeV

mH <144 GeV (95% CL)114 < mH <182 GeV (95% CL) with LEP

S. Heinemeyer, W. Hollik, D. Stockinger, A.M. Weber, G. Weiglein '06

A. Clark 15

Highlights of CDF Run II - a summary of SM Higgs boson search

The results shown are 95% CL limits for the SM Higgs. In case of (e.g.) MSSM or SUGRA Higgs or similar, results no longer apply€

Search for H →W +W − 1.9 fb -1

Search for WH → lνbb 1.7 fb -1

Search for ZH → ννbb 1.9 fb -1

Search for hbb with ≥ 3 B - tags 1.0 fb -1

A. Clark 16

Highlights of CDF Run II

OTHER RECENT G

ENEVA RESULTS

A. Clark 17

CDF Run II highlights - W helicity in t-decays (S. Moed) - 1.7 fb-1

- W helicity in t-decay fixed by mt, mW, V-A structure of tWb vertex

- f-=fLH ~30%, fo=flong~70%, f+=fRH~0.036% in SM

- fully reconstruct (lepton+jet events), measure cos*

- fit with unbinned likelihood

1D fit: (fixed f0 or f+)fo= 0.57±0.11(stat)

±0.04(sys)f+ < 0.07 (95% CL)

2D fit:fo= 0.61±0.20(stat)

±0.03(sys)f+= -0.02±0.08(stat)

±0.03(sys)

18

Measurements using SVT triggered sampleSee talk of Sofia Vallecorsa

Data is compared to LO and MC@NLO QCD

CDF Run II highlights - Contributions from Geneva - the SVT trigger

€

pp→ bb + X (Sofia Vallecorsa)

€

pp→ bb + γ + X (Till Hoffmann)

€

pp→ b(b) + X (Monica D'Onifrio)

€

pp→ b(b) + γ + X (Mario Campanelli)

OTHER Run II analyses:

€

pp→ γγ + X (Yanwen Liu)

€

First Br(B → μ +μ - (K) ) (Andras Zsenei)

€

ΔΓΓ

(Mauro Donega)

A. Clark 19

6: Conclusions and Outlook

Rigorous comparison of SM processes with NLO/LO expectationsSearch for evidence of new physics

Development of new analysis techniques relevant to LHCExpect to double data set in 2008, reach 6-7 fb-1 be Oct 2009

- CDF (+D0) have unprecedented data sets

- Goals of Run II being met mt, mW, Dms, ….- Major t-quark, diboson

studies in SM