Recent Results in High p T Physics from CDF

LHC Symposium, May. 2, 2003 p. 1

Recent Results in High PT Physics from CDFGregory Veramendi

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

CDF data taking Running stably since

Feb. ’02Silicon 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

July 2001

Approvedfor analysis

Commissioning

CDF Run II Upgrade

=1 Improved Si coverage

|| < 2 8 layers

Central Drift Chamber 96 layers

Time of Flight Expanded coverage Forward Calorimeter Trigger

COT tracks at L1 Silicon tracks at L2

Electroweak Program Baseline Measurements

W/Z cross sectionsRatio of W/Z cross sectionLepton UniversalityForward-Backward Asymmetry

Improve EWK parametersW Charge Asymmetry

- Constrains on PDFs

Diboson Production- Look for Anomalous couplings

W Mass Measurement- Dominated by Systematics

•B(W-->ll)

Clean Signature Isolated leptonMissing 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

•B(Z-->ll)

Sample Back. •B(Z-->ll) (pb)

e 1830 0.6% 267±6stat±15sys±16lum

1631 0.9% 246±6stat±12sys±15lum

Require two isolated leptonsNegligible backgrounds

72 pb-1

Essential for Detector CalibrationsEnergy scale and resolution ID efficiency

W and Z cross sections

R and W

(pp(ppZ)Z) (W)(W) (Z (Z ee) ee)(pp(ppW)W) (W (W e e)) (Z)(Z)

TheoreticalTheoreticalpredictionprediction

PDGPDGSMSM

PDGPDGcombined Expcombined ExpMeasureMeasure

ExtractExtract

RR (W) [GeV](W) [GeV]

ee 9.889.880.240.24statstat0.470.47ss

2.292.290.060.06statstat0.100.10

syssys

10.6910.690.270.27statstat0.30.3

33syssys 2.112.110.050.05statstat 0.070.07syssys

e+e+ 10.5410.540.180.18statstat0.30.3

33syssys 2.152.150.040.04statstat0.070.07

syssys

W and Lepton Universality

Clean W decays Baseline for analyses using ’s

sysstateWBR

WBR07.004.099.0

Forward-Backward Asymmetry

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

AFB using Dielectrons

)0(cos)0(cos

We Charge Asymmetry Al constrains PDF’s

Charge ID and polar coverage essential

Uses new Calorimeter seeded Silicon trackingConsistent tracking: ||<2 Improvement on Run I

Blind AnalysisResults: Summer

dedded

deddedAl /)(/)(

/)(/)()(

Diboson Couplings:W Signature

One high pT lepton One photon (R(-l)>0.7) ET

Results consistent with SM SM: •B(W-->l) = 18.7 ±1.3 pb

Sample Back.

•B(W-->l) (pb)

e 43 33% 17.2±3.8stat±2.8sys±1.0lum

38 29% 19.8±4.5stat±2.4sys±1.2lum

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.

•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

Diboson:WW

Search for W W productionDilepton + ET search

Consistent with SM Wait for more statistics

Precursor to SM Higgs Search

Source ee e ll Background 0.290.13 0.470.19 0.770.60 1.530.64 WW ll 0.550.13 0.660.15 1.580.36 2.790.62 Data 1 0 1 2

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

Many precision tests of top to come with more data

Top spin polarization

Production Cross Section

Resonance production ?

Production kinematics

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, ET

- BR ~ 1/9 (e, : ~5%)

Lepton + Jets

- 1 high-pT lepton, 4 jets (2 b’s), ET

- BR ~ 4/9 (e,: ~30%)

All-hadronic: - 6 jets (2 b’s)

e-e (1/81)

mu-mu (1/81)

tau-tau (1/81)

e -mu (2/81)

e -tau (2/81)

mu-tau (2/81)

e+jets (12/81)

mu+jets(12/81)

tau+jets(12/81)

jets (36/81)

TeV) 8.1(30.1TeV) 96.1( ss tttt

Dilepton Cross Section Signature

Two high pT Isolated leptons

Veto Z, cosmic, conversion (ET,l/j)>20o, or ET>50 GeV

ET > 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 ±1.5syspbNLO:tt(s=1.96 TeV)=6.70+0.71

-0.88 pb (hep-ph/0303085(ML Mangano et al))

Lepton + jet Cross Section Signature

One high pT Isolated lepton

Veto Z, cosmic, conversion ET > 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

tt=5.3 ±1.9stat ±0.8syspb

control signal

Top production cross sections

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 log-likelihood distribution

Systematic uncertainty to improve with understanding of detector

Top mass with b tag B tag

Lower backgrounds

Improves mass resolution

Same selectionRelaxed 4th jet

requirement11 candidates

Work in ProgressResults by

Summer

Lepton + Jets Candidate Events

tttt l l + jet candidate:+ jet candidate: Nov 02 2002 run: 153693 event: 799494 (CMUP) + 4 jets

pT() = 54.4 GeVET

j = 96.7, 65,8, 54.8, 33.8 GeV

ET= 40.8 GeV

Jet2Lego viewJet3

• muon• electron• photon

New Physics?? Where to look? Two Approaches at CDF Model driven searches

Drell-Yan spectrum searchLeptoquarksDoubly charged HiggsSUSY

Signature driven searchesDijet spectrumCHArged Massive ParticlesPhoton final states

Search in Drell-Yan Spectrum High Mass Dileptons

electrons & muons used Sensitive to Z’ and Randall-Sundrum Graviton No excess observed

e+e- + -

Search in Drell-Yan Spectrum

Run Lum.(pb-1) Mass Limit

(95% CL) (GeV/c2)

Run1a (1.8TeV) 19.7 505

Run1b (1.8TeV) 90 640

Run2(1.96TeV)Run2(1.96TeV) 7272 665665

Already Improving on Run I!!

1st Generation Scalar LeptoQuarks

LQLQ e+e-qq 2 high ET electrons, 2 jets

0 events observed Background: 3.4±3 events

M(LQ)>230GeV/c2 (R1:>220)

LQLQ qq 2 high ET jets, large ET

42 events observed Background: 43±11 events

60<M(LQ)<107GeV excl.

H++ Search Arises in extensions of

SM (L-R symmetric) Same sign leptons

Low backgroundsStudy with less

integrated luminosity Dielectron channel

Signal above Z poleLow mass used as

control- 0 events observed

- Background: 0.6±0.5

Binned Search: 0 events

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-’s: 260 < m < 640 GeV/c2

E6 diquarks: 280 < m < 420 GeV/c2

W‘ : 300 < m < 410 GeV/c2

Highest Dijet mass event

Run 152507 event 1222318

Dijet Mass = 1364 GeV (corr)

cos * = 0.30

z vertex = -25 cm

J1 ET = 666 GeV (corr)

583 GeV (raw)

J1 = 0.31 (detector)= 0.43 (correct z)

J2 ET = 633 GeV (corr)

546 GeV (raw)

J2 = -0.30 (detector)= -0.19 (correct z)

CDF Run 2 Preliminary

Run I max: 1040 GeV

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

DiPhoton Search 2 central photons ET>13 GeV Cosmic and beam halo rejection

Good agreement with SM 0 Diphoton + Lepton

Events observed

Run Iia Prospects Towards the next

few years:

Sample

W’lZ’ll

WV (W’l, V=W,,Z)

ZV (Z’ll, V=W,,Z)

tt (mass sample, 1 b-tag)

77k10k903020

Run IIa

2300k202k1800500800

Event yields per experiment (2 fb-1)

MW~40 MeVMt ~ 3 GeV

DØ / CDF

Run 2aPredicti

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

Backup Slides

AFB backup

WW cross section backup

Dilepton backup

Secondary Vertex Tagging

SecondaryVertex

+L+Lxyxy

Jet axisPrimaryVertexPrompt

Tracks

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)

(event tag) = 45 1 5 %

L+jets backup

Top Mass backup

Diphoton Backup Backgrounds in

lWZZe+jet

P(e fake )=2% Limit Set:

Mc>113 GeV

DY search backup

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

Leptoquark search backup

eeqq searchDominant Back.

- Drell-Yan, top

ee search:

CHAMP backup

SignalSignal

W-->eControl:

H++ Search

Dominated by DYOPAL Limit: m>98.5-100.5depending on coupling

Higgs Sensitivity

Status as of 2000 Studies with Run II

ongoingRun II simulationRun II Efficiencies

New report expected in June ‘03

Recent Results in High p T Physics from CDF

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