DD

May 21, 1998 H.Evans / NSF Site Visit 1

The Bright Future

We won’t rest on our Laurels ! Tevatron is Changing…. So will DØ….

DØ Run II

DD

May 21, 1998 H.Evans / NSF Site Visit 2

Tevatron Upgrade

Param Run I Run II

ECM [TeV] 1.8 2.0

Bunch X-ingFreqTime

[kHz][ns]

2903500

2500396

7500132

BunchesNp

anti-p[1010][1010]

66235.5

3636273

121121273

Lumi [cm 2s

1] 21030 21032 21032

Ldt [pb 1] 125 2000

Inter’s/X-ing 2.5 5.8 2.3

Rates

Inelastic pp 100 kHz 10 Mhz

pp bb(y<1) 100 Hz 10 kHz

pp WX 0.04 Hz 4.4 Hz

pp tt 500 tot 4 / hour

DD

May 21, 1998 H.Evans / NSF Site Visit 3

(some) Run II Topics

Measurement Run I Run II sens.ELECTROWEAK

MW 80.430.11 GeV 40 MeVAnom Coupl ~0.3 0.5 0.1

AFB(W) sin2lept=0.23149(21) 0.0007TOP

Mt 172.17.1 GeV 3 GeV(pp tt) 5.91.7 pb 10%

Single Top 25%Vtb 3%

Pol: t bW0 3%FCNC 10

2 10 3

NEW PHYSICSsquark/gluino 270 GeV 300 GeVLQ(S) 1st Gen 225 GeV 240 GeV

W’/Z’ 720/680 GeV 1 TeVB PHYSICS

B(b Xs+

) 3.210 4

CP: sin 0.15Bs Mixing (xs) 12 16

QCDFlavor Tagging Wc / c

Jet Rates E Scale

DD

May 21, 1998 H.Evans / NSF Site Visit 4

D Upgrade

Sub-System Run I Run II

MagnetsSolenoidToroid

none2 T

2 T2 T

Tracking Drift ChambersTRD

Silicon VtxScint FibersPre-Shower

Calorimetry U LarCu,SS LAr

New electronics

Muons Drift TubesScintillators

Add Chambers

Trigger 2 Levels 3 Levels

Columbia Leadership Upgrade Co-Leadership: Tuts Calorimeter Electronics: Kotwal,Tuts Silicon Trigger: Evans,Gara Muon L2 Trigger: Evans,Gara

DD

May 21, 1998 H.Evans / NSF Site Visit 5

D Upgrade

New

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, Tra

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Sh

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DD

May 21, 1998 H.Evans / NSF Site Visit 6

Trigger System

Too Much Physics !

Trigger (132 ns between collisions) Sharp Thresholds Multi-Component Correlations Don’t Forget: Multiple Interact’s

3 Level System in D

L1 L2 L3

In Rate 10MHz 10kHz 1kHz

Out Rate 10kHz 1kHz 20Hz

Decision 4.2s 100s 25ms

Objects SingleDetector

Correla-tions

SimpleEventRecon

Inelast bb W tt Tape

10MHz 10kHz 4.4Hz 10 3Hz 20Hz

DD

May 21, 1998 H.Evans / NSF Site Visit 7

Silicon Tracking

4 Layers Double Sided Strip Detectors 6 Barrel segments (30° wedges) All Have r Readout: res Layers 1,3: 90 strips (10m res)

2,4: 2° stereo (30m res) 72 cm coverage (beam z = 25 cm)

12 F-Disks / 4 H-Disks Forward Coverage

Total Channel Count: 793K

DD

May 21, 1998 H.Evans / NSF Site Visit 8

Si Track Trigger Preprocessor

Silicon Track Trigger [MRI]

Include Si Info onto Tracks at L2 r Info only PT , 0 , Impact Param

Sharpen PT Thresholds Include Impact Param Info Displaced Vertices

A Few Benefits….. Zbb for Jet E-Scale 4 better Bgd Rejection for WH0

Z Vertex Trigger [KDI]

Calc z-positions of Interactions 90° stereo Sharpen ET Thresholds ID Multiple Interactions

~ 500 m (beam z = 25 cm)

DD

May 21, 1998 H.Evans / NSF Site Visit 9

Impact Parameter

Collision

B-Hadron:

Flight Length ~ mm’s

Decay Vertex

B Decay Products

Impact Parameter

Impact Parameter Resolution: 50 m PT = 1 GeV

15 m PT = 10 GeV

DD

May 21, 1998 H.Evans / NSF Site Visit 10

STT Preprocessor

SMTDetector

Cluster Finder

CFT Tracks(L1 Trig)

Associate Clustersto Tracks

Re-Fit Trackw/ Si Clusters

Global L2 Trigger

50

s T

ime

Bud

get

DD

May 21, 1998 H.Evans / NSF Site Visit 11

SVTZ Preprocessor

Cluster Finder

Histogram

Accumulator

SMTDetector

Feature Finder

Global L2 Trigger

Vertices from all possible Layer 1,3 hit combinations (in 30° sector) histo

Z-Positions of True Vertices Peaks in Histo

DD

May 21, 1998 H.Evans / NSF Site Visit 12

Columbia Directions

Hardware: Calorimeter Electronics Silicon Track Triggers Muon L2 Trigger

Analysis: Electroweak B-Related Topics Fermilab SUGRA Working Group

People: In process of hiring a new Postdoc Increased use of Nevis Engineering Actively Recruiting Grad/Undergrad

Students High School Student Involvement