Scientific Highlights : CDF Experiment

1. Introduction

2. CDF Run-II detector

3. Phyiscs highlightsB Physics, Top, Higgs, …

to be continued by Rob

October 20, 2010US-Japan 30th Anniversary SymposiumKona, Hawaii

Fumihiko Ukegawa

CDF: Collider Detector at Fermilab

• Fermilab Tevatron : Proton-antiproton collider • Highest energy accelerator / collider,

at √s = 1.96 TeV, till 2009• Run-II experiment in progress since 2001

It is certainly an “on-going” experiment, but …

CDF

• Rich history of collaborative work

• A lot of physics output, even for highlights

• Impossible to cover them all in two 7-minute talks

• More appropriate persons to speak than myself (I am just a “young fella” in CDF)

• If I would qualify for it, it is because I started out in CDF as a grad student … And I am still on CDF– I thought it would be the only experiment I work on

It has been going on for three decades !

Back to the present …

Peak luminosity

2×10

32

2010/10/1

Record peak lum :

　　　 4.02×1032 cm-2 s-1 (April 16, 2010)

Antiproton accumulation ratesRecord : 28.6×1010 / hour

Weekly : 73.1 pb-1 (Apr 13 – 20, 2009)

Monthly : 273 pb-1 (March 2010)

Annual : 2.5 fb-1 (US FY2010)

Integrated luminosity

Run-II total　 ~ 9.5 fb-1

Tevatron performance

2010/10/1

Total ~ 9.5 fb-1

2001/4/1

4×10

32

Run-II CDF DetectorFrom inside out(Blue: new in Run-II experiment)

• Tracking system• Silicon detectors : vertex• Main drift chamber COT : p

• TOF counter : K/ sep.

• Solenoid ： 1.5 Tesla

• EM calorimetersPlug cal, Central pre-shower

• Hadron calorimetersPlug cal

• Muon chambersForward muon systemExcellent tracking (large solenoid)

Cal with projective tower geometryGood lepton ID capabilities

Plug EM Calorimeter

Scintillating tiles + WLS fiber + PMT Fast response, good energy resolution + uniformity, small dead space

KEK, Tsukuba, Waseda

Scintillator + fiber, PMT by Kuraray, Hamamatsu

SVX II• 5 layers • Radii from 2.5 cm to 11 cm • Double-sided, 90o and 1.2o stereo

Intermediate silicon layers (ISL)• 3 more layers at R = 20 - 29 cm• Construction similar to SVX II• Precision tracking to higher eta

CDF-II silicon detectors

Layer 00• At radius ~1.6 cm, on beam pipe• Minimize multiple scattering • Single-sided

Collision point

Precision tracking and vertexing : crucial for top and B physics

ISL　　 Tsukuba, Osaka City ~50% of sensors by Hamamatsu

SVX II 　 Hiroshima, Okayama Layer 1, 2, 4 sensors by Hamamatsu

Layer 00

Installation

The CDF Detector

Running smoothly and efficiently

CDF Physics

Many important results in:• Electroweak physics• Top Quark physics• B physics• QCD• Higgs searches• New particles / phenomena

> 250 journal publications with Run-II data,More to come.

22 PhD’s from Japanese institutions (Run II)

CDF B physics

No explicit mention of B physics in the design report (1981)

CDF turned out to be quite suited for B physics Solenoid + tracking, calorimeters, lepton ID

1. Run 0 (1988 – 89)Demonstration that CDF can detect B decays

Single electrons, di-muons

2. Run I (1992 – 96)Silicon vertex detector installed

Significant measurements ( lifetimes, Bd oscillations, Bc discovery …)

3. Run II (2001 - )Enhanced capability with silicon trigger (SVT)

Bs oscillations, CP violation, rare decays …

Blue: significant Japanese physicist contributions

Fourier analysis

Summer 2005 Fall 2006

Impact on the CKM unitarity triangle

CKM theory tested/confirmed with precision Nobel prize 2008 Now looking for possible inconsistencies due to new physics

Looking for new CP phase beyond CKM

Signal～ 6500 5.2 fb-1

SM

More data will surely help

Forbidden at tree level in SMCan proceed in higher order

Belle result on asymmetry

hint of new physics ?

Sensitive to new physics

F/B asymmetryPolarization mass dist.

Want more data here, too

Conclusions

• Excellent original detector design philosophy Large solenoid + precision tracking, Segmented tower cals, Lepton ID

• Went through continuous upgradesEnhanced physics capabilities

• Accelerator performance has excelled too 23 events 30 nb-1 4.5 pb-1 110 pb-1 > 10 fb-1

1985 1987 1988-89 1992-96 2001 -

• EWK, QCD, Top, Exotics, Higgs, and B physics

• Looking forward to the 4th decade !

Backup slides

Run-II Silicon Vertex Trigger : SVT

Use silicon information at the 2nd level of trigger

Calculate the impact parameters of tracks on-line,with a resolution of ~50 m

Enables us to collect B deacys to hadronic final states, such as

TOF counter

Central Preshower Counter (CPR2)Scintillating tiles with WLS fiber readout

Hamamatsu H871116-pixel multi-Anode PMT