Not-SUSY-Nor-Higgs Exotic
Searches at TeVatron Run II
Marumi Kado
LAL-Orsay
Synopsis, Selected Topics
BSM theory
Vs. Topology
ADD
RS
Z’
ee/mm



LQ
TC
EL
EQ

eeg
em
Model Independent*

e/m+jets
Jets+MET

Mono-Jet


Di-jets

gg

g+MET


Run I
Topics will be discussed in three main classes :
*Upon
request
- Searches for high mass resonances
- Searches for new particles decaying to visible known particles
- Search for particles escaping undetected in topologies with MET
All limits will be given at the 95% Confidence Level
Search for High Mass Resonances
DiLepton and DiPhoton High Mass Analyses
For instance in ED models :
Simple event selection : Two flavor-like and opposite-charge leptons (e or m) or
photons with PT / ET in excess typically of 25 GeV/c
Interpretation of the ℓℓ invariant mass spectrum…
200 pb-1
…DØ Model dependent interpretation
…CDF less model dependence, only
spin assumption (0,1,2)
ℓℓ Interpretation in terms of Z’ and Little Higgs Searches
CDF and DØ have excluded Z’ masses in the E6 Grand Unified Model
CDF uses fits to the invariant di-lepton mass assuming a spin-1 resonance
Different E6 models
200 pb-1
channel
L (pb-1)
ZI
Zc
Zy
Zh
ee
200
570
610
625
650
mm
126
425
455
465
495
ee
200
575
640
650
680
SM like Z’
Ruled out ~2TeV by LEP
CDF
DØ
Different E6 models
Within E6 models limits better than LEP indirect limits
CDF has also interpreted this search in the Little Higgs Model which predicts
a heavy neutral boson Zh (for cotan q =1) :
ee :
M Zh  825 GeV/c 2
mm :
M Zh  790 GeV/c 2
ℓℓ and gg Interpretation in terms of RS Resonance
Hierarchy problem solved with one warped ED in a 5D AdS Space with metric :
ds 2  e2 kyhm dx m dx  dy 2
The smaller k/MPl the narrower the first KK excitation, but smaller s
CDF uses fits to the invariant di-lepton mass assuming a spin-2 resonance
Cross Section Limits for different k/MPl
ee
ee
Exclusion domains in the
RS graviton model
The gg exclusion profits from a higher
BR at high mass
DØ 200 pb-1
mm
gg
DØ (ee) ~ CDF
Search For High Mass Resonances in the Dijet
Mass Spectrum
CDF have interpreted their 75 pb-1
Dijet mass spectrum… searching for
resonances coupling strongly
Excluding exotic particle masses (axigluon,
Excited Quark, color octet Technirho)
between ~280 and 410 GeV/c2
Excluding RS graviton between
~220 and 840 GeV/c2
(k/MPl=0.3)
Axigluon reach up to 1,1 TeV/c2
A Non-Resonant Case (due to the mass continuum
of the KK states) : ADD models
Hierarchy problem using n large compactified EDs :
M Pl  M Sn  2 R n
In the ADD case the search is based on the dilepton and diphoton differential s
 2s
2
s SM  s 4h  s 8h 2 

*
*
 cosq M  ,gg  cosq M  ,gg
Interference
KK Graviton
exchange
DØ Inclusive approach including e and g as “EM” objects
Two dimensional binned likelihood fit M2EM and cos q
With 200 pb-1 (Combined with Run I) : M S  1.43 TeV
Same in mm with 100 pb-1 :
M S  0.88 TeV
CDF Simple fit to Mee with 200 pb-1 :
M S  1.11 TeV
Limits given in the GRW model where :
1
h 4
MS
New Particles Decaying to known Ones
Search for Excited Leptons Radiative Decays : the eeg Topology
CDF has performed a model dependent search (200 pb-1) :
~3 bkg. events expected and 3 events observed
Two signal production models considered :
Contact interaction
For Me* = L
M e*  889 GeV/c 2
Gauge boson
mediated
For Me* = L/f
M e*  208 GeV/c 2
Searches for LeptoQuarks
LeptoQuarks are bosons with color and fractional electric charges and with both
baryon and lepton numbers predicted in GU theories
LeptoQuarks couple to lepton and quarks of the same generation
Charged leptons coupling parameter b=BR(LQ→(e,m,t)q)
LQ are produced in pairs at TeVatron :
Searched for the first and second generation in three main topologies :
- Two leptons and two jets
(eejj, mmjj)
- One Lepton and two jets and MET (ejj)
- Two Jets and MET
(jj)
Searches for First Generation LeptoQuarks
DØ performed a combined search for first generation LQs in both the eejj
and ejj channels within 175 pb-1 :
eejj selection : Two isolated electrons and two
jets, the radiative Z events are removed by an ee
invariant mass cut, a large total ET is required
~0.4 bkg. events expected and 0 events observed
M LQ  238 GeV/c 2 (b  1)
ejj selection : One isolated electron, two jets
and MET (isolated from the lepton), high MTe and
a large total ET
~4.7 bkg. events expected and 2 events observed
M LQ  194 GeV/c 2 (b  0.5)
Combined Result
Search for Second Generation LeptoQuarks
CDF performed a search for second generation LQs in the mmjj
channels within 200 pb-1 :
mmjj selection : Similar event selection as in
the eejj channel with an additional cut in the
SPTm vs. SETj
~3.1 bkg. events expected and 2 events
observed
M LQ  240 GeV/c 2 (b  1)
Search Independent of the LeptoQuark Generation
CDF performed a search for any generation LQs in the jj channel
within 191 pb-1 :
jj selection : Lepton veto, two or three Jets and MET
isolated from the jets
~118 bkg. events expected and 124
events observed
M LQ  117 GeV/c 2 or M LQ  78 GeV/c 2 (b  0)
Search for Particles Undetected in
Topologies with MET
Jets+MET/Monojet Analysis
DØ performed a search for large extra dimensions (ADD) in the Jets+MET
channel within 85 pb-1 :
KK gravitons produced with one
or more jets
Monojet selection : At least one jet with 150 GeV ET
and MET (isolated from the jet) in excess of 150 GeV
~100 bkg. events expected and 84
events observed
Limit on MS vs. n :
LEP
No k factor
Conclusion
DØ and CDF have analyzed up to 200 pb-1 of data in the framework of
searches for Not-SUSY-Nor-Higgs Searches and have exceeded the Run I
performance in most of the analyses…
BSM theory
Vs. Topology
ADD
RS
Z’
ee/mm



LQ
TC
EQ

eeg
em
Model Independent*

e/m+jets
Jets+MET

Mono-Jet


Di-jets

gg

g+MET
EL


Run I
However DØ and CDF have now accumulated about ~350 pb-1 of data
Most results will be updated within a few weeks
Model Independent Search : em
Very clean signature worth a model independent inclusive search
DØ search performed within 100 pb-1
Interpretation of the observed MET spectrum in terms of an excluded domain
in acceptance times Cross section