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
PANIC 2008November, 2008
Searches using Photons and/or Jets at CDF
David Toback, Texas A&M University2
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!
PANIC 2008November, 2008
Searches using Photons and/or Jets at CDF
David Toback, Texas A&M University3
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)
PANIC 2008November, 2008
Searches using Photons and/or Jets at CDF
David Toback, Texas A&M University4
New Physics in Dijets+Met
p
p
Lepto-Quark
Lepto-Quark
Squark
Squark
AlsoSensitive
ToLots ofModels
Jet
Jet
01
~01
~
PANIC 2008November, 2008
Searches using Photons and/or Jets at CDF
David Toback, Texas A&M University5
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
PANIC 2008November, 2008
Searches using Photons and/or Jets at CDF
David Toback, Texas A&M University6
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
PANIC 2008November, 2008
Searches using Photons and/or Jets at CDF
David Toback, Texas A&M University7
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
PANIC 2008November, 2008
Searches using Photons and/or Jets at CDF
David Toback, Texas A&M University8
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
PANIC 2008November, 2008
Searches using Photons and/or Jets at CDF
David Toback, Texas A&M University9
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
PANIC 2008November, 2008
Searches using Photons and/or Jets at CDF
David Toback, Texas A&M University10
+JetsNew model
independent search in the +2 jet final stateNo evidence for new
physicsLimits on GMSB in
progress
PANIC 2008November, 2008
Searches using Photons and/or Jets at CDF
David Toback, Texas A&M University11
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
PANIC 2008November, 2008
Searches using Photons and/or Jets at CDF
David Toback, Texas A&M University12
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
PANIC 2008November, 2008
Searches using Photons and/or Jets at CDF
David Toback, Texas A&M University13
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
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