Recent Results in High p Physics from CDF Gregory Veramendi CDF
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Transcript Recent Results in High p Physics from CDF Gregory Veramendi CDF
CDF
Recent Results in High pT
Physics from CDF
Gregory Veramendi
UC Berkeley / LBNL
(For the CDF Collaboration)
• Introduction: Data taking and CDF II upgrade
• Electroweak Results
• Top Results
• Searches for new Physics
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 1
CDF
CDF data taking
Running stably since
Feb. ’02
Silicon sensitive to
beam conditions
>150 pb-1 to tape
5-8 pb-1/week
~82% efficiency
53-91 pb-1 used in
current “winter”
analyses
Commissioning
July 2001
Gregory Veramendi
Recent Results in High PT Physics from CDF
Approved
for analysis
LHC Symposium, May. 2, 2003 p. 2
CDF
CDF Run II Upgrade
Improved Si coverage
|| < 2
8 layers
Central Drift Chamber TOF
96 layers
Time of Flight
Expanded coverage
Forward Calorimeter
Trigger
=2
=3
COT tracks at L1
Silicon tracks at L2
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 3
CDF
Electroweak Program
Baseline Measurements
We
W/Z cross sections
Ratio of W/Z cross section
Lepton Universality
Forward-Backward Asymmetry
Improve EWK parameters
W Charge Asymmetry
-
Z
Constrains on PDFs
Diboson Production
-
Look for Anomalous couplings
W Mass Measurement
-
Dominated by Systematics
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 4
•B(W-->ll)
CDF
W-->
Clean Signature
Isolated lepton
Missing ET
High & S/B
72 pb-1
Sample Back. •B(W-->ll) (nb)
e
38625
6%
2.64±0.01stat±0.09sys±0.16lum
21599
11%
2.64±0.02stat±0.12sys±0.16lum
2346
26%
2.62±0.07stat±0.21sys±0.16lum
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 5
•B(Z-->ll)
CDF
Require two isolated leptons
Negligible backgrounds
72 pb-1
Essential for Detector
Calibrations
Energy scale and resolution
ID efficiency
Gregory Veramendi
Sample Back.
•B(Z-->ll) (pb)
e
1830
0.6%
267±6stat±15sys±16lum
1631
0.9%
246±6stat±12sys±15lum
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 6
CDF
W and Z cross sections
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 7
R and GW
CDF
Measure
R =
Theoretical
prediction
PDG
SM
PDG
combined Exp
(ppW) G(W e) G(Z)
(ppZ) G(W) G(Z ee)
Extract
R
G(W) [GeV]
e
9.880.24stat0.47sys
2.290.06stat0.10sys
10.690.27stat0.33sys
2.110.05stat 0.07sys
e+ 10.540.18stat0.33sys
Gregory Veramendi
2.150.04stat0.07sys
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 8
CDF
W and Lepton Universality
Clean W decays
Baseline for analyses using ’s
BR (W )
0.99 0.04 stat 0.07 sys
BR (W e )
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 9
CDF
AFB using Dielectrons
Forward-Backward Asymmetry
d (cos 0) d (cos 0)
AFB
d (cos 0) d (cos 0)
Exploits forward coverage of
electrons
||<3
Direct probe of ,Z couplings
Sensitive to interference from
new physics
High mass reach is unique to
Tevatron
Results consistent with SM
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 10
CDF
We Charge Asymmetry
Al constrains PDF’s
d (e ) / d d (e ) / d
Al ( )
d (e ) / d d (e ) / d
Charge ID and polar
coverage essential
Uses new Calorimeter
seeded Silicon tracking
Consistent tracking: ||<2
Improvement on Run I
Blind Analysis
Results: Summer
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 11
CDF
Diboson Couplings:W
Signature
One high pT lepton
One photon (R(-l)>0.7)
E/ T
Results consistent with SM
SM: •B(W-->l) = 18.7 ±1.3 pb
Sample Back •B(W-->l) (pb)
.
Gregory Veramendi
e
43
33% 17.2±3.8stat±2.8sys±1.0lum
38
29% 19.8±4.5stat±2.4sys±1.2lum
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 12
CDF
Diboson Couplings:Z
Signature
Two high pT leptons
One photon (R(-l)>0.7)
Results consistent with SM
SM: •B(Z-->ll) = 5.4 ± 0.4 pb
Sample Back
.
Gregory Veramendi
•B(Z-->ll) (pb)
e
11
4.6%
5.5±1.7stat±0.6sys±0.3lum
14
4.0%
6.0±1.6stat±0.7sys±0.4lum
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 13
CDF
Diboson:WW
Search for W W production
Dilepton + E/ T search
Consistent with SM
Wait for more statistics
Precursor to SM Higgs Search
Source
Background
WWll
Data
Gregory Veramendi
ee
0.290.13
0.550.13
1
0.470.19
0.660.15
0
e
0.770.60
1.580.36
1
Recent Results in High PT Physics from CDF
ll
1.530.64
2.790.62
2
LHC Symposium, May. 2, 2003 p. 14
CDF
Top Program
Establish Baseline
Measurements from Run I
Top cross section
Precision test of QCD
Probe for non-SM
Production
Top Mass
Preliminary Result
Getting machinery warmed
up!
Top spin polarization
Production Cross Section
Resonance production ?
Production kinematics
Many precision tests of top
to come with more data
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 15
CDF
Production and Decay of Top
Top decays as a free quark
top ~ 4x10-25s
BR(t->Wb) ~100%
3 classes of signals
Dilepton
-
2 high-pT leptons, 2 b jets, E
/T
BR ~ 1/9 (e, : ~5%)
1 high-pT lepton, 4 jets (2 b’s), E/T
BR ~ 4/9 (e,: ~30%)
mu-mu (1/81)
tau-tau (1/81)
e -tau (2/81)
mu-tau (2/81)
e+jets (12/81)
mu+jets(12/81)
tau+jets(12/81)
All-hadronic:
-
(1/81)
e -mu (2/81)
Lepton + Jets
-
e-e
jets
6 jets (2 b’s)
(36/81)
tt ( s 1.96 TeV) 1.30 tt ( s 1.8 TeV)
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 16
CDF
Signature
Dilepton Cross Section
Two high pT Isolated leptons
Veto Z, cosmic, conversion
(E
/ T,l/j)>20o, or E/T>50 GeV
E
/ T > 25
Two jets with ET>10 GeV
Total transverse energy > 200 GeV
Expect S/B ~ 9, S~2.5
Find 5 candidate events in 72 pb-1
Expect 0.3 ± 0.12 background events
tt=13.2 ±5.0stat ±1.5syspb
NLO:tt(s=1.96 TeV)=6.70+0.71-0.88 pb
(hep-ph/0303085(ML Mangano et al))
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 17
CDF
Signature
Lepton + jet Cross Section
One high pT Isolated lepton
Veto Z, cosmic, conversion
E
/ T > 20 GeV
3 or more jets with ET>15 GeV
1 jet with secondary vertex tag
B tag improves S/B 1/6 3/1
Find 15 candidate events in
57.5 pb-1
Expect 3.8 ± 0.5 background
events
control
signal
tt=5.3 ±1.9stat ±0.8syspb
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 18
CDF
Top production cross sections
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 19
CDF
Top Mass
Select l +4 jet events
Same as cross section, but no b
tags
33 candidate events
Method
24 combinations in an event
2-C fit applied, lowest 2 is
chosen to get mass for each
event
A continuous likelihood method
is used with parameterized
mass templates
Mtop is the minimum of loglikelihood distribution
Systematic uncertainty to improve
with understanding of detector
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 20
CDF
Top mass with b tag
B tag
Lower
backgrounds
Improves mass
resolution
Same selection
Relaxed 4th jet
requirement
11 candidates
Work in Progress
Results by
Summer
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 21
CDF
Lepton + Jets Candidate Events
tt l + jet candidate:
Nov 02 2002 run: 153693 event: 799494
(CMUP) + 4 jets
Lego view
Jet3
pT() = 54.4 GeV
ETj = 96.7, 65,8, 54.8, 33.8 GeV
ET= 40.8 GeV
Jet2
Jet1
Jet4
µ
• muon
• electron
• photon
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 22
CDF
New Physics??
Where to look?
Two Approaches at CDF
Model driven searches
Drell-Yan spectrum search
Leptoquarks
Doubly charged Higgs
SUSY
Signature driven searches
Dijet spectrum
CHArged Massive Particles
Photon final states
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 23
CDF
Search in Drell-Yan Spectrum
High Mass Dileptons
electrons & muons used
e+e-
Gregory Veramendi
Sensitive to Z’ and Randall-Sundrum Graviton
No excess observed
+ -
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 24
CDF
Search in Drell-Yan Spectrum
Lum.(pb-1)
Mass Limit
(95% CL) (GeV/c2)
Run1a (1.8TeV)
19.7
505
Run1b (1.8TeV)
90
640
Run2(1.96TeV)
72
665
Run
Already
Improving on
Run I!!
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 25
CDF
1st Generation Scalar LeptoQuarks
LQLQ e+e-qq
2 high ET electrons, 2 jets
0 events observed
2 high ET jets, large E
/T
Background: 3.4±3 events
M(LQ)>230GeV/c2 (R1:>220)
Gregory Veramendi
LQLQ qq
42 events observed
Background: 43±11 events
60<M(LQ)<107GeV excl.
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 26
CDF
H++ Search
Arises in extensions of
SM (L-R symmetric)
Same sign leptons
Low backgrounds
Study with less
integrated luminosity
Dielectron channel
Signal above Z pole
Low mass used as
control
- 0 events observed
- Background: 0.6±0.5
Binned Search: 0 events
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 27
CDF
DiJet Search
Consistent with SM
Set limits on New Physics
Axigluons or flavor universal
colorons:
200 < m < 1130 GeV/c2
Excited quarks:
200 < m < 760 GeV/c2
Color octet techni-r’s:
260 < m < 640 GeV/c2
E6 diquarks:
280 < m < 420 GeV/c2
W‘ :
300 < m < 410 GeV/c2
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 28
CDF
Highest Dijet mass event
Run 152507 event 1222318
Dijet Mass = 1364 GeV (corr)
cos * = 0.30
z vertex = -25 cm
J2 ET = 633 GeV (corr)
546 GeV (raw)
J2 = -0.30 (detector)
= -0.19 (correct z)
J1 ET = 666 GeV (corr)
583 GeV (raw)
J1 = 0.31 (detector)
= 0.43 (correct z)
CDF Run 2 Preliminary
Run I max: 1040 GeV
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 29
CDF
CHArged Massive ParticleS
Stable charged particle that
escapes detector
Massive Slow moving
Use TOF detector
7 events observed
Background: 2.9±3.2 events
Candidate: stop
NLSP in GMSB
Isolated: M(stop) > 108 GeV
non-isolated M(stop) > 95 GeV
LEP: M(stop)>95 GeV
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 30
CDF
DiPhoton Search
2 central photons ET>13 GeV
Cosmic and beam halo rejection
Good agreement with SM
0 Diphoton + Lepton
Events observed
M
E
/T
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 31
CDF
Run Iia Prospects
Towards the next
few years:
Event yields per experiment (2 fb-1)
Sample
Run I
Run IIa
Wl
Zll
77k
10k
90
30
20
2300k
202k
1800
500
800
WV (Wl, V=W,,Z)
ZV (Zll, V=W,,Z)
tt (mass sample, 1 b-tag)
Gregory Veramendi
DØ / CDF
Run 2a
Prediction
Recent Results in High PT Physics from CDF
MW~40 MeV
Mt ~ 3 GeV
LHC Symposium, May. 2, 2003 p. 32
CDF
Summary
Run 2a is well underway!
Re-established baseline electroweak
measurements
Top program has been launched!
Many exotics measurements improve on
Run I results!
We look forward to larger datasets and
testing the Standard Model to even greater
precision
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 33
CDF
Gregory Veramendi
Backup Slides
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 34
CDF
Gregory Veramendi
AFB backup
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 35
CDF
WW cross section backup
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 36
CDF
Gregory Veramendi
Dilepton backup
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 37
CDF
Gregory Veramendi
Dilepton backup
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 38
CDF
Secondary Vertex Tagging
Signature of a b decay is a displaced vertex:
Long lifetime of b/c hadrons (c ~ 450 m)
B hadrons travel Lxy~3mm before decay with large charged track
multiplicity.
Algorithm:
Look for displaced vertices: all combination of at least 2 tracks
Jet is tagged as b-jet if Lxy/xy >3 (typical xy~150m)
Secondary
Vertex
d0
+Lxy
Jet axis
Prompt
Tracks
Primary
Vertex
Gregory Veramendi
Recent Results in High PT Physics from CDF
(event tag) =
45 1 5 %
LHC Symposium, May. 2, 2003 p. 39
CDF
Gregory Veramendi
L+jets backup
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 40
CDF
Gregory Veramendi
Top Mass backup
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 41
CDF
Diphoton Backup
Backgrounds in
l
W
Z
Z
e+jet
P(e fake )=2%
Limit Set:
Mc>113 GeV
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 42
CDF
Gregory Veramendi
DY search backup
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 43
CDF
Dijet mass backup
Axigluons or Colorons:
200 < m < 1130 GeV/c2
Run I:200<m< 980GeV/c2
Excited quarks:
200 < m < 760 GeV/c2
Run I:200<m< 570&580 <m< 760
Color octet techni-r’s:
260 < m < 640 GeV/c2
Run I:260<m< 480 GeV/c2
E6 diquarks:
280 < m < 420 GeV/c2
Run I:290<m< 420 GeV/c2
W‘ :
300 < m < 410 GeV/c2
Run I:300<m< 420 GeV/c2
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 44
CDF
Leptoquark search backup
ee search:
eeqq search
Dominant Back.
- Drell-Yan, top
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 45
CDF
CHAMP backup
Signal
Signal
Control:
W-->e
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 46
CDF
H++ Search
Dominated by DY
OPAL Limit: m>98.5-100.5
depending on coupling
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 47
CDF
Higgs Sensitivity
Status as of 2000
Studies with Run II
ongoing
Run II simulation
Run II Efficiencies
New report expected
in June ‘03
Gregory Veramendi
Recent Results in High PT Physics from CDF
LHC Symposium, May. 2, 2003 p. 48