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
We
 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-->ll)
CDF
W-->

Clean Signature
 Isolated lepton
 Missing ET


High  & S/B
72 pb-1
Sample Back. •B(W-->ll) (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
(ppW) G(W  e) G(Z)
(ppZ) G(W) G(Z  ee)
Extract
R
G(W) [GeV]
e
9.880.24stat0.47sys
2.290.06stat0.10sys

10.690.27stat0.33sys
2.110.05stat 0.07sys
e+ 10.540.18stat0.33sys
Gregory Veramendi
2.150.04stat0.07sys
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

We 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
WWll
Data
Gregory Veramendi
ee
0.290.13
0.550.13
1

0.470.19
0.660.15
0
e
0.770.60
1.580.36
1
Recent Results in High PT Physics from CDF
ll
1.530.64
2.790.62
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
Wl
Zll
77k
10k
90
30
20
2300k
202k
1800
500
800
WV (Wl, V=W,,Z)
ZV (Zll, 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~150m)
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