Not-SUSY-Nor-Higgs Exotic Searches at TeVatron Run II Marumi Kado LAL-Orsay
Jan 14, 2016
Not-SUSY-Nor-Higgs Exotic Searches at TeVatron Run II
Marumi KadoLAL-Orsay
Synopsis, Selected TopicsBSM theory
Vs. TopologyADD RS Z’ LQ TC EL EQ
ee/
ee
e Model Independent*
e/+jets
Jets+MET
Mono-Jet
Di-jets
+MET Run I
Topics will be discussed in three main classes : - 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
*Upon request
Search for High Mass ResonancesDiLepton and DiPhoton High Mass Analyses
Simple event selection : Two flavor-like and opposite-charge leptons (e or ) or photons with PT / ET in excess typically of 25 GeV/c
Interpretation of the ℓℓ invariant mass spectrum…
…DØ Model dependent interpretation…CDF less model dependence, only
spin assumption (0,1,2)
For instance in ED models :
200 pb-1
ℓℓ Interpretation in terms of Z’ and Little Higgs Searches
channel L (pb-1) ZI Z Z Z
CDFee 200 570 610 625 650
126 425 455 465 495
DØ ee 200 575 640 650 680
CDF and DØ have excluded Z’ masses in the E6 Grand Unified ModelCDF uses fits to the invariant di-lepton mass assuming a spin-1 resonance
CDF has also interpreted this search in the Little Higgs Model which predicts a heavy neutral boson Zh (for cotan =1) :
SM like Z’Ruled out ~2TeV by LEP
ee : :
Different E6 models
Different E6 models
Within E6 models limits better than LEP indirect limits
200 pb-1
GeV/c 825 2Zh
M GeV/c 790 2Zh
M
ℓℓ and Interpretation in terms of RS Resonance
Hierarchy problem solved with one warped ED in a 5D AdS Space with metric :
The smaller k/MPl the narrower the first KK excitation, but smaller
CDF uses fits to the invariant di-lepton mass assuming a spin-2 resonance
222 dydxdxeds ky
Cross Section Limits for different k/MPl
Exclusion domains in the RS graviton model
ee
The exclusion profits from a higher BR at high mass
ee
DØ 200 pb-1
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 RS graviton between ~220 and 840 GeV/c2 (k/MPl=0.3)
Excluding exotic particle masses (axigluon, Excited Quark, color octet Technirho)
between ~280 and 410 GeV/c2
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 :
In the ADD case the search is based on the dilepton and diphoton differential
nnSPl RMM 2
284
,*
2
,*
2
coscos
SMMM
KK Graviton exchange
Interference
DØ Inclusive approach including e and as “EM” objects Two dimensional binned likelihood fit M2EM and cos With 200 pb-1 (Combined with Run I) :
Same in with 100 pb-1 :
CDF Simple fit to Mee with 200 pb-1 :
TeV 1.43 S M
TeV 0.88 S M
TeV 1.11 S M
4
1
SMLimits given in the GRW model where :
Search for Excited Leptons Radiative Decays : the eeTopology
New Particles Decaying to known Ones
CDF has performed a model dependent search (200 pb-1) :
Contact interactionGauge boson
mediated
GeV/c 889 2
e* M GeV/c 208 2
e* MFor Me* =
~3 bkg. events expected and 3 events observed
Two signal production models considered :
For Me* = f
Searches for LeptoQuarks
LQ are produced in pairs at TeVatron :
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 =BR(LQ→(e,)q)
Searched for the first and second generation in three main topologies :- Two leptons and two jets (eejj, jj) - One Lepton and two jets and MET (ejj)- Two Jets and MET (jj)
Searches for First Generation LeptoQuarks
DØ performed a combined search for first generation LQs in both the eejj and ejj 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
ejj selection : One isolated electron, two jets and MET (isolated from the lepton), high MT
e and a large total ET
~0.4 bkg. events expected and 0 events observed
1)( GeV/c 238 2 LQM
0.5)( GeV/c 194 2 LQM~4.7 bkg. events expected and 2 events observed
Combined Result
Search for Second Generation LeptoQuarks
CDF performed a search for second generation LQs in the jj channels within 200 pb-1 :
jj selection : Similar event selection as in the eejj channel with an additional cut in the PT
m vs. ETj
~3.1 bkg. events expected and 2 events observed
1)( GeV/c 240 2 LQM
Search Independent of the LeptoQuark Generation
jj selection : Lepton veto, two or three Jets and MET isolated from the jets
CDF performed a search for any generation LQs in the jj channel within 191 pb-1 :
~118 bkg. events expected and 124 events observed
0)( GeV/c 78 or GeV/c 117 22 LQLQ MM
Search for Particles Undetected in Topologies with METJets+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
LEP
~100 bkg. events expected and 84 events observed
Limit on MS vs. n :
No k factor
ConclusionDØ 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…
However DØ and CDF have now accumulated about ~350 pb-1 of dataMost results will be updated within a few weeks
BSM theory
Vs. TopologyADD RS Z’ LQ TC EL EQ
ee/
ee
e Model Independent*
e/+jets
Jets+MET
Mono-Jet
Di-jets
+MET Run I
Model Independent Search : e
DØ search performed within 100 pb-1
Very clean signature worth a model independent inclusive search
Interpretation of the observed MET spectrum in terms of an excluded domain in acceptance times Cross section