David Toback Texas A&M University For the CDF collaboration

PANIC 2008November, 2008

Searches using Photons and/or Jets at CDF

David Toback, Texas A&M University1

David TobackTexas A&M University

For theCDF collaboration

Searches using Photons and/or Jets

at CDFDavid TobackTexas A&M University

For theCDF collaboration




OutlineThe CDF detector and tools are working

so well that the next generation of more sophisticated analyses are coming out with 2 fb-1 of data

1. Dijets: Mass and Met2. b+jet+Met3. Lepton++b+Met: Model-

independent searches and a first measurement of the tt Cross Section

4. +jets and +Met: Model-independent searches and new limits on Gauge Mediated Supersymmetry

Hot off the presses!




New Physics in Dijets

p

p Jet

JetLook for Mass Bumps

SensitiveTo

Lots ofModels

Dijet Mass (GeV) New Particle Mass (GeV)

New Particle Mass (GeV)




New Physics in Dijets+Met

p

p

Lepto-Quark

Lepto-Quark

Squark

Squark

AlsoSensitive

ToLots ofModels

Jet

Jet

01

~01

~




b+jet+MetModel-independent

search in the +b+jet+Met final state

Sensitive to a number of different models

Potential to observe an excess in multiple

distributions

01χ~

t~ c02χ~

1χ~

01χ~b

No evidence for new physics




Compare with 20 times the data and a better detector

b+jet+MetIn Run I with 85 pb-1 a small excess was observed Potential anomaly not

confirmed




Search in l+b+MetAnother example of a CDF Model-independent search for new physics

Natural extension of the +lepton+Met search

Potential to observe an excess in multiple

distributions




Natural extension of the lbMet analysis

Require 3 jets and HT>200 GeV

Section Cross the Measure tt

2.32.1-6.7 of background a

on events Observed 16




More natural solution for FCNC problems than mSUGRA

Gauge-Mediated SUSY Breaking Models

inflation of models and nsobservatio alAstronomic with Consistent

candidatematter dark warm aprovide models G~χ~0

1

G~Early Universe Later Universe

WarmDark

Matter

01χ~

CDF Run I ee+Met candidate event

Nanosecond lifetimes




+JetsNew model

independent search in the +2 jet final stateNo evidence for new

physicsLimits on GMSB in

progress




New model independent search in the +Met

New tool: Sophisticated mechanism to measure the significance of the Met

measurement

+Met

No evidence for new physics

Can straightforwardly separate QCD

backgrounds with no intrinsic Met from EWK

that does




Gauge Mediated SupersymmetryOptimize the +Met analysis for 0 ns

lifetime: Significant Met and Large HT

Complement to the Delayed Photon AnalysisNo evidence for new

physicsApproaching the Cosmology

Favored Region

Set limits for zero andNon-zero lifetimes




ConclusionsThe LHC era has started but the Tevatron is still collecting data and leading the search for Supersymmetry and Beyond the Standard Model Physics

The next generation of sophisticated tools and model-independent searches at CDF may well prove to make the discovery we all hope is just around the corner

“Don't look back —

something might be

gaining on you."

-Satchel Paige

David Toback Texas A&M University For the CDF collaboration

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