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
Sole
noid
, Tra
ckin
g S
yste
mS
i, S
ciF
i,P
resh
ow
ers
Sh
ield
ing
Forw
ard
Min
i-d
rift
ch
am
bers
Forw
ard
Scin
tillato
rC
en
tral S
cin
tillato
r
+ N
ew
Ele
ctr
on
ics,
Tri
g,
DA
Q
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