CDF Logo Vista/Sleuth Global Search for New Physics in p-pbar Collisions at sqrt(s)=1.96 TeV
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Data collected in Run II of the Fermilab Tevatron are searched for indications of new electroweak scale physics. Rather than focusing on particular new physics scenarios, CDF data are analyzed for discrepancies with Standard Model prediction.

A model-independent approach (Vista) considers the gross features of the data, and is sensitive to new large cross section physics. A quasi-model-independent approach (Sleuth) emphasizes the high-&Sigma pT tails, and is particularly sensitive to new electroweak scale physics.

This global search for new physics in 927 pb-1 of p-pbar collisions at sqrt(s)=1.96 TeV reveals no indication of physics beyond the Standard Model.



Blessed Plots and Tables:

Vista plots and tables:

Sleuth plots and tables:

Vista Summary Information

Illustration of available Vista information
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Vista summary of final state populations
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Graphical summary of Vista final state population discrepancies
No final state shows a significant population discrepancy, after accounting for the trials factor
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Graphical summary of Vista kinematic variable distribution discrepancies
Interest is focused on the outliers, representing distributions with significant discrepancy
However, after analysis, none of these discrepant distributions motivate a new physics claim
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Vista Final State Examples

Vista W production: missing pT
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Vista Z production: e+ pT
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Vista electron-jet final state: M(e,j)
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Vista photon-jet final state: photon pT
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Vista muon-jet final state: muon pT
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Vista muon-jet final state: muon pseudorapidity (eta)
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Vista tau-jet final state: tau pT
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Vista t-tbar lepton+jets with a b-tag: top quark mass
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Vista jet-missing ET final state: jet azimuthal angle

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Vista 3j1tau final state: mass(tau,j1,j2)
The distribution with the most discrepant shape found
in the Vista final state with the largest population discrepancy
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Vista Discrepancies

Vista 3j final state: deltaR(j2,j3)
Significant discrepancy seen - parton shower parameters being investigated
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Vista 3j final state: mass(j2,j3)
Significant discrepancy seen - parton shower parameters being investigated
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Vista Z production: unclustered pT
Pythia Tune AW used to describe Z pT...
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Vista 2j final state: unclustered pT
... but simultaneously describing intrinsic kT in all final states is difficult
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Vista 1b1e+1j final state: deltaR(b,j)
This comes from the production of 3 jets in which one jet
is misreconstructed as a b and one as an electron. The
imprint of the 3j deltaR(j2,j3) is seen clearly in this fnal
state, in this plot.
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Vista Plots Relevant for Sleuth's Most Discrepant Final States

Vista b+jet final state: b pT
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Vista b+jet final state: j pT
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Vista b+jet final state: Mass(b)
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Vista b+jet final state: Mass(j)
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Vista b+jet final state: deltaR(j,b)
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Vista b+2 jets final state: deltaR(j2,b)
Similar effect to 3j final state
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Vista jet+missing energy final state: j pT
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Vista jet+missing energy final state: missing pT
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Vista Tables

Vista correction factor definitions
Values and errors obtained from global fit to data
These are only applicable within the context of the Vista correction model
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Vista correction factor constraints
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Vista mis-identification correction factor values
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Vista trigger correction factor values
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Single-particle gun study
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Single-particle gun study
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Sleuth Summary Information

Summary of Sleuth's result
No final state shows a significant excess in the sumPt distribution that could indicate the presence of new physics
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Observed distribution of scriptP from all Sleuth final states (data)
The deviation from a uniform distribution illustrates the known remaining imperfections in the correction model used to obtain the SM estimate
Conglomeration around 0 (1) indicates probable under(over)-estimation of the SM background in these final states
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Observed distribution of scriptP from all Sleuth final states (data)
Same as above, but in a Gaussian mapping to reveal values closer to 0 and 1
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Sleuth's Most Discrepant Final States

Sleuth #1 discrepant final state
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Same as above, with log scale in the inset
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Sleuth #2 discrepant final state
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Same as above, with log scale in the inset
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Sleuth #3 discrepant final state
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Sleuth #4 discrepant final state
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Sleuth #5 discrepant final state
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Sleuth Sensitivity Studies

Sleuth sensitivity to some specific new physics models
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Sleuth sensitivity to some specific new physics models, compared to dedicated searches (where available)
Sleuth's sensitivity is seen to be broadly comparable to that of dedicated analyses when the signal satisfies Sleuth's basic assumptions
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Sleuth final state containing t-tbar to lepton+jets with 1 b-tag
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Sleuth final state containing t-tbar to lepton+jets with 1 b-tag
after removing t-tbar from SM, and re-fitting Vista correction factors
Sleuth easily 'discovers' t-tbar when it is removed from SM
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Sleuth final state containing t-tbar to dileptons (different flavour) with 1 b-tag
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Sleuth final state containing t-tbar to dileptons (different flavour) with 1 b-tag
after removing t-tbar from SM, and re-fitting Vista correction factors
Sleuth easily 'discovers' t-tbar when it is removed from SM
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Sleuth final state containing t-tbar to dileptons (same flavour) with 1 b-tag
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Sleuth final state containing t-tbar to dileptons (same flavour) with 1 b-tag
after removing t-tbar from SM, and re-fitting Vista correction factors
Sleuth easily 'discovers' t-tbar when it is removed from SM
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Sleuth final state containing WW
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Sleuth final state containing WW
after removing dibosons from SM and refitting Vista correction factors
Sleuth 'discovers' WW when it is removed from SM background
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Example sensitivity test pseudo-discovery - GMSB model
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TildeScriptP as a function of integrated luminosity, when
there is no ttbar in the background.
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Sleuth Supporting Material

Effect on tildeScriptP with variation of background scale factor for Sleuth's top 3 most discrepant final states
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Transverse (COT) view of the highest sum pT event in the 1bb Sleuth final state.
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Transverse (COT) view of highest sum pT event in the 1pmiss Sleuth final state.
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Longitudinal (RZ) view of the highest sum pT event in the 1pmiss Sleuth final state.
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Zoom on the transverse (COT) view of the track identified as electron (magenta) and its nearest neighbor (red), in the only event
with a central electron reconstructed in the 1e+1jj1mu+1pmiss Sleuth final state. It probably is a conversion (&gamma -> ee).
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Zoom on the longitudinal (RZ) view of the track identified as electron (magenta) and its nearest neighbor (red), in the only event
with a central electron reconstructed in the 1e+1jj1mu+1pmiss Sleuth final state. It probably is a conversion (&gamma -> ee).
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