Results and Perspective at CDF and D0

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Results and Perspective at CDF and D0

• The Tevatron and Main Injector
• CDF and D0 Detectors
• Physics
• QCD
• Flavor Physics, Bottom and Top
• Electroweak
• Beyond the standard model
• The Higgs
• Conclusions

H. E. Montgomery,Cargese, 99
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Acknowledgements

• Franco Bedeschi
• Al Goshaw
• Cecilia Gerber
• Steve Holmes
• Greg Landsberg
• John Marriner
• Shekhar Mishra
• Maria Roco
• Greg Snow
• Monica Techio
• Andre Turcot
• Harry Weerts
• John Womersley

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Livingston Plot
Increased Luminosity --gt Increased Constituent CM
Energy 1800 --gt 2000 GeV --gt 40 for Top X sec
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Protons or Antiprotons? - The Physics

• Quark - antiquark processes
• Dominant when subprocess cms energy is large
  fraction of total high x, valence partons
• top production at Tevatron\
• Gluon-Gluon Interactions
• Dominant when subprocess cms energy is small
  fraction of total low x, sea partons
• top production at LHC
• low mass Higgs production at LHC

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Protons or Antiprotons? - The Machine

• History of complex!
• What machines have you already?
• Pbarp, single magnetic ring
• SppbarS at CERN
• Tevatron at FNAL
• BUT need pbar production and cooling, a
  limitation
• pp two magnetic rings, but helped by 2 in 1
  design
• (SSC)
• Large Hadron Collider

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Main Injector Performance
Mixed Mode delivers 5.0 1012 to pbar target and
2.5 1013 to experimental target every 1.87 or
2.87 seconds.
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Proton Economics
Collider/NuMI Mode delivers 5.0 1012 to pbar
target and 2.5 1013 to experimental target every
1.87 secs. lt5 impact on pbar production Collide
r/Slow Spill Mode delivers 5.0 1012 to pbar
target and 2.5 1013 to experimental target every
2.87 secs. 15-20 impact on pbar
production stores will be longer, RECYCLER
helps. Slip Stacking(x2), Booster
Aperture(x1.5) gt 5-10 1013
protons ultimately.
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Luminosity
Protons in Bunch
Total Antiprotons
Frequency
Beam Sizes
Beam Shape Form factor at Intersection
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Antiprotons

• Production
• 120 Gev Protons impact on target
• 8 GeV antiprotons produced, large angles
• focussed using Lithium Lens
• Accumulation
• antiprotons injected into large aperture
  accelerators
• Debuncher
• Accumulator
• Recycler
• Cooling
• multiple stochastic cooling systems
• different bandwidth systems react to different
  characteristics of the beam
• Acceleration
• Main Injector 8 to 150 GeV
• Tevatron 150 GeV - 1000 GeV

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Antiprotons

• Recycling
• during store luminosity reduces
• main effect is dilution of bunches (as compared
  to pbar attrition due to collisions)
• at end of store, half of antiprotons remain
• Reuse them!
• Deccelerate to 120 GeV
• extract from Tevatron into Main Injector
• decelerate to 8 GeV
• extract into Recycler Ring
• Recycler Ring
• Permanent Magnet Storage Ring
• Magnetic field controlled by mechanical
  construction of magnets
• Reliable, less dependent on power glitches!
• Also used for cooling antiprotons after
  production and Accumulator

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Tevatron Collider Parameters
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Interactions per Crossing Tevatron Collider
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Tevatron Luminosity Evolution
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Main Injector Status

• Civil Construction Complete
• Installation Complete except
• Commissioning
• Beam Accelerated to 150 GeV
  ( Injection Energy to Tevatron)
• Beam Accelerated to 120 GeV
• 95 Efficiency
• 2.5 sec cycle time
• 1.0 1013 protons per cycle
• MI operating near design params.
• MI now operating for physics!

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Main Injector

• 1 1013 protons/cycle

• 2.5 sec cycle time

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CDF
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CDF Key Features

• Muon Detector
• Scintillator Calorimeter, extended to higher eta
• Large Tracking volume
• Solenoid, 1.4 T
• Central Outer Tracker, open cell drift chamber,
  with stereo
• Intermediate Silicon Layers
• Silicon vertex tracker

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The CDFII Detector

• NEW FOR CDFII
• Tracking system
• Silicon vertex detector (SVXII)
• Intermediate silicon layers (ISL)
• Central outer tracker (COT)
• Scintillating tile end plug calorimeter
• Intermediate muon detectors
• Front-end electronics (132 ns)
• Trigger system (pipelined)
• DAQ system (L1, L2, L3)

• RETAINED FROM CDFI
• Solenoidal magnet
• Central and wall calorimeters
• Central and extension muon detectors

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CDF Tracking
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CDF COT
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CDF Tracking
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CDF Silicon
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CDF Trigger
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Beyond the Baseline proposal for CDF II Layer 00

• Additional layer of low mass single-sided silicon
  detector _at_ r 1.6 cm mounted around the
  beam-pipe
• FEATURES
• hit resolution 8 mm.
• impact parameter resolution ( )
• SVXI SVX II SVX II
  L00
• a (mm) 13 10
  7
• b (mmGeV) 34 38 ?76 22 ?
  27
• adds only 2.5 to existing number of SVXII
  channels.

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Beyond the Baseline proposal for CDF II TOF

• Scintillator based time-of-flight detector to be
  placed between COT and the solenoid at r 138
  cm.
• Exploit advanced RD program.
• FEATURES
• single bar average timing resolution 100 ps.
• p/K separation at 2s level for Pt lt 1.6 GeV/c.
• need very stable (lt25 ps) clock to measure t0.

Time difference as a function of pt
K/p
p/p
200 ps
1.6 GeV
dE/dx in COT 1-1.5s separation for pT gt 2GeV
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The D0 Detector
Muon System 1.9T mag. Fe Prop. drift tubes 40,000
channels
Calorimeter Uranium-liquid Argon 60,000 channels
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D0 Detector

• New for Run II
• Solenoidal magnet
• Tracking, Fibers, Silicon
• Forward Muons
• Preshowers
• FE Elect., DAQ

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D0 Tracking
Fiber tracker
Level 0
Silicon
Forward Preshower
Solenoid
Central Preshower
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D0 Fiber Tracker

• Barrels
• 8 carbon fiber barrels
• 20ltrlt50cm
• full coverage to h 1.7
• Scint Fibers
• 830mm Æ, multiclad
• 2.6m active length
• 10m clear waveguide to photodetector
• rad hard (100 krad) (10yr _at_ 20cm
  _at_1032)
• Fiber Ribbons
• 8 axial doublets
• 8 stereo doublets (2o pitch)
• Readout
• 77,000 channels
• VLPC readout
• run at low temp (9 K)
• fast pickoff for trigger
• SVXII readout

side view
end view
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D0 Fiber Tracker

• Visible Light Photon Counter (VLPC)
• Avalanche Photo Diode
• well matched to light from fiber (l 525 nm)
• quantum efficiency 80
• fast response, high rate capability
• SiAs (band gap 0.05 eV)
• high gain (40000) , low gain dispersion
• operate at
• 8ltTlt10 K
• 6ltVbiaslt7.5 V

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D0 Silicon Detector Layout
disk/barrel module
ladders
F disk
H disks
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D0 Silicon Microstrip Tracker
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D0 Tracker Performance

• Combined Fiber, Silicon gives mass resolutions
  30- 100 MeV for eg J/Psi, B mesons

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DØ Calorimeter
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D0 Muon Central Trigger Detectors

• A-f counter design and prototyping complete
• Grooved 1/2 scintillator with WLS fiber into a
  1² PMT
• Good performance 50 p.e.s, 1.5 ns resol.
• Production to start June, 97

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D0 Muon Forward Tracking Detector

• 50k mini-drift tubes (MDT), 3 layers
• 1 lt h lt 2 1x1 cm tubes
• (4,3,3) decks in (A,B,C) layers
• Prototyp MDT module built (48 8-cell tubes)
• Test beam meas. with MDTs underway
• Production start July 97
• Design/layout/fabrication of prototype front-end
  electronics in progress

MDT module in test beam
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Muon Forward Trigger Detector

• 4608 scint counters in 3 layers
• 4000 MELZ PMTs and 400 bases/shields in hand
  (90 received tested)
• Test beam measurements underway
• Pixel production start July, 97
• Design/layout/fabrication of prototype counter
  front-end electronics in progress

1 lt h lt 2 A,B,C-layers
Segmentation DhDf 0.1 4.5o
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DØ in Run II

• Diffractive results based on rapidity gaps so
  far
• Run II starts in year 2000 with major detector
  upgrades
• Run II 20 ? 100 pb-1 2 fb-1
• Forward proton detector project
• 18 Roman pots
• 4 quadrupole spectrometer stations -- 4
  directions
• 2 dipole spectrometer stations -- one direction
• Quadrupole spectrometer
• Few percent acceptance in the region of x lt 0.05
• Double Pomeron scattering -- tag outgoing p and p
• Dipole spectrometer
• Full acceptance for p with t lt 3 GeV2 and 0.05
  lt x lt 0.1
• Double Pomeron scattering (tag outgoing p gap or
  
• p tag on other side), Diffractive jet and W
  production,
• Pomeron structure

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B Production Features
hB
bg
hB
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BTeV Experiment