Recent Results in High p T Physics from CDF

48
LHC Symposium, May. 2, 2003 p. 1 CDF Recent Results in High P T Physics from CDF Gregory Veramendi Recent Results in High p T 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

description

Recent Results in High p T 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. ’02 - PowerPoint PPT Presentation

Transcript of Recent Results in High p T Physics from CDF

Page 1: Recent Results in High p T  Physics from CDF

LHC Symposium, May. 2, 2003 p. 1

CDF

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

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LHC Symposium, May. 2, 2003 p. 2

CDF

Recent Results in High PT Physics from CDFGregory Veramendi

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

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

CDF Run II Upgrade

TOF

=2

=3

=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

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

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

We

Z

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

•B(W-->ll)

Clean Signature Isolated leptonMissing ET

High & S/B 72 pb-1

W-->

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

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

•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

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

W and Z cross sections

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

R and W

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

RR =

TheoreticalTheoreticalpredictionprediction

PDGPDGSMSM

PDGPDGcombined Expcombined ExpMeasureMeasure

ExtractExtract

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

ee 9.889.880.240.24statstat0.470.47ss

ysys

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

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

W and Lepton Universality

Clean W decays Baseline for analyses using ’s

sysstateWBR

WBR07.004.099.0

)(

)(

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

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

)0(cos)0(cos

dd

ddAFB

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

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 /)(/)(

/)(/)()(

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

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

/

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

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

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

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

/

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

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!

Many precision tests of top to come with more data

Top spin polarization

Production Cross Section

Resonance production ?

Production kinematics

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

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

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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))

// /

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CDF

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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

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

Top production cross sections

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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

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

Top mass with b tag B tag

Lower backgrounds

Improves mass resolution

Same selectionRelaxed 4th jet

requirement11 candidates

Work in ProgressResults by

Summer

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

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

µ

Jet1

Jet2Lego viewJet3

Jet4

• muon• electron• photon

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

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

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

Search in Drell-Yan Spectrum High Mass Dileptons

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

e+e- + -

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

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!!

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

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.

/

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

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

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

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

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

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

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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

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

Good agreement with SM 0 Diphoton + Lepton

Events observed

ET /M

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CDF

Recent Results in High PT Physics from CDFGregory Veramendi

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)

Run I

77k10k903020

Run IIa

2300k202k1800500800

Event yields per experiment (2 fb-1)

MW~40 MeVMt ~ 3 GeV

DØ / CDF

Run 2aPredicti

on

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Recent Results in High PT Physics from CDFGregory Veramendi

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

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Backup Slides

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AFB backup

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WW cross section backup

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Dilepton backup

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Dilepton backup

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Secondary Vertex Tagging

SecondaryVertex

+L+Lxyxy

d0

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 %

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L+jets backup

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Top Mass backup

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Diphoton Backup Backgrounds in

lWZZe+jet

P(e fake )=2% Limit Set:

Mc>113 GeV

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DY search backup

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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

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Leptoquark search backup

eeqq searchDominant Back.

- Drell-Yan, top

ee search:

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CHAMP backup

SignalSignal

W-->eControl:

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H++ Search

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

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Higgs Sensitivity

Status as of 2000 Studies with Run II

ongoingRun II simulationRun II Efficiencies

New report expected in June ‘03