Non SUSY Searches at the Tevatron

Non SUSY Non SUSY Searches at the Searches at the

TevatronTevatron

XXXIXth Rencontres de MoriondXXXIXth Rencontres de Moriond

QCD and Hadronic InteractionsQCD and Hadronic Interactions

La Thuile, 28 March- 3 AprilLa Thuile, 28 March- 3 April

Rocío Vilar, IFCA (CSIC-UC)On behalf of the CDF and DØ collaborations

Rocío Vilar, IFCA/UC Rencontres de Moriond, March 31st 2

OutlineOutline ee/ee/ Analysis Analysis

Z’, Extra Dimensions, Technicolor, SUSY, etc. Z’, Extra Dimensions, Technicolor, SUSY, etc.

ee Analysis Analysis eeee

Excited LeptonsExcited Leptons e/e/ + Jets + Jets

Leptoquarks (First and Second generations)Leptoquarks (First and Second generations) Jets + Missing Tranverse Energy (MET)Jets + Missing Tranverse Energy (MET)

Leptoquarks (All generations)Leptoquarks (All generations) Jet + Missing Transverse Energy(MET)Jet + Missing Transverse Energy(MET)

Extra DimensionsExtra Dimensions ConclusionsConclusions


Dilepton High Mass Dilepton High Mass AnalysesAnalyses

Search for resonances in high invariant mass

Results can be interpreted under many different models: Z’ (E6, sequential, little higgs)

Large Extra Dimensions

Randall Sundrum

Technicolor

SUSY

Etc

CDF and DØ has slightly different approach:

CDF : Calculate the acceptances Calculate the acceptances and resonances for 3 different and resonances for 3 different spin assumption( 0,1,2) and spin assumption( 0,1,2) and applied to many models. applied to many models. DØ: Calculate the acceptances Calculate the acceptances and resonances for eachand resonances for each specific specific modelmodel


Dilepton High Mass(ee, Dilepton High Mass(ee, ))

CDF/DØ set limits for low-energy CDF/DØ set limits for low-energy E6 models using dilepton eventsE6 models using dilepton events

Two lepton with Et(Pt)>25 GeVTwo lepton with Et(Pt)>25 GeV at least one central leptonat least one central lepton

DØ uses mass window cuts and DØ uses mass window cuts and counting experimentcounting experimentCDF fit the MCDF fit the Mllll spectrum spectrum

channel

LL

(pb(pb-1-1))

ZI 95%C.95%C.

L L (GeV)(GeV)

Z99

5%C.L 5%C.L (GeV)(GeV)

Z99


Z99


CDFeeee 200200 5757

00616100

626255

656500

126126 424255

454555

464655

494955

DØ eeee 200200 575755

646400

656500

686800

DØ preliminary 200 pb-1Upper limit 95% C.L.

780 GeV

CDF has interpreted this result in the Little Higgs model (littlest higgs model)

Predict a heavy neutral boson ZPredict a heavy neutral boson Zh h

decaying into dileptonsdecaying into dileptonsRelevant parameter is the mixing Relevant parameter is the mixing angle cotangle cot

ee: MZ’h >825 GeV (cot= 1.0)

:MZ’h >790 GeV (cot= 1.0)


Dilepton High Mass(ee,Dilepton High Mass(ee,)) Large Extra Dimensions

ADD (GRV convention) MMplpl

22 = (M = (Mplpl|3+N|)N+2|3+N|)N+2 )R )RNN=M=Ms s

N+2N+2 R RNN

N>=3 only tested at collidersN>=3 only tested at colliders The cross section is parameterized in The cross section is parameterized in

terms ofterms of = = /M/Mss

44

DØ CDF

LL

(pb)(pb)

95%C.95%C.L L

(TeV)(TeV)

LL

(pb)(pb)

95%C.95%C.LL

(TeV)(TeV)

diEm 200200 1.361.36 200200 1.111.11

diEm ( I+II)

1.431.43

100100 0.8800.880

CDF: 2 electron Et>25 GeV Fit to the Mee spectrumDØ: 2 EM objects(e/) Et>25 GeV 2 Pt>25 GeV 2D Fit to the Mll and cos*


Dilepton High Mass(ee,Dilepton High Mass(ee,) ) CDF interpret as Randall-Sundrum graviton

1 highly curved extra dimension1 highly curved extra dimension Gravity localised in the EDGravity localised in the ED Excited Kaluza-Klein gravitonExcited Kaluza-Klein graviton

Decays to leptonsDecays to leptons Relevant parameters: k/MplRelevant parameters: k/Mpl

Set upper limits at 95% C.L.ee: MG >625 GeV (k/Mpl= 0.1) @ 200 pb -1

:MG>475 GeV (k/Mpl = 0.1) @ 126 pb-1

CDF uses acceptances CDF uses acceptances

from spin2 casefrom spin2 case


Dilepton High Mass(ee,Dilepton High Mass(ee,)) DØ has done a search for TEV-1

Extra dimensions

Chiral fermions in 3DChiral fermions in 3D SM bosons propagates in extra SM bosons propagates in extra >0 dimensions, >0 dimensions,

and are equivalent to KK towers with Massesand are equivalent to KK towers with Masses MM22

nn= M= Moo22 + n + n22MM22

cc

Gives rise to mixing among SM boson and the Gives rise to mixing among SM boson and the nth modes of W/Znth modes of W/Z

First direct searchAt 95%C.L Mc > 1.12 TeV

Indirect searches:LEP: > 6.6 TeV; all: > 6.8 TeV

198 pb-1


e Analysise Analysis DØ has done model DØ has done model

independent search in eindependent search in e channelchannel

Search for an excess over Search for an excess over the SM prediction in the the SM prediction in the kinematic spacekinematic space

Look at the Missing ELook at the Missing ET , T ,

sensitive to new Physicssensitive to new Physics Set upper limits at 95 % Set upper limits at 95 %

C.L.C.L.L L = 98 pb= 98 pb-1-1

1 electron E1 electron Ett>25 GeV>25 GeV

1 muon Pt>25 GeV1 muon Pt>25 GeVGood fiducial volumeGood fiducial volume0/1 jet0/1 jet


eeeenalysisnalysis CDF has done a search for

excited electron, predicted in many compositeness models

Produce via contact or gauge mediated interactions

The cross section depends on e* mass and

L = 200 pb-1L = 200 pb-12 electron /2 electron /At least one Central electronAt least one Central electronExpected 2.98 Expected 2.98 +0.4+0.4

-0.3 -0.3 ; observed: 3; observed: 3

first time searchContact interaction: At 95% C.L. Me*>889GeV (Me* = )

Gauge mediated: At 95% C.L. Me*>208GeV (Me*= )


Color triplet bosons with Color triplet bosons with lepton and barion numbers, lepton and barion numbers, and fraction chargeand fraction charge

Predicted in several Predicted in several theories: GUT, technicolor, theories: GUT, technicolor, SUSY,etcSUSY,etc

Assume LQ couples to Assume LQ couples to lepton and quark of same lepton and quark of same generationgeneration

Pair produced at TevatronPair produced at Tevatron LQ decays:LQ decays:

LQ lq (l = e,LQ lq (l = e,) ) =1 =1 LQ LQ q q = 0 = 0

= BR(LQ lj)= BR(LQ lj)

Lepton+Jets analysis Lepton+Jets analysis Dominant at Tevatron

30% increase in cross section at RunII


e+Jets Analysise+Jets Analysis eejj channel (=1)

Two isolated electron in fiducial regionTwo isolated electron in fiducial region Two jetsTwo jets Remove events in the Z peakRemove events in the Z peak (E(Ett(e(e11)+ E)+ Ett(e(e22)+ E)+ Ett(j(j11)+ E)+ Ett(j(j22) )>450 GeV) )>450 GeV

ejj channel (=0.5) Isolated central electronIsolated central electron Two jetsTwo jets MET >30 GeV, MET >30 GeV, (e,MET)>0.7˚(e,MET)>0.7˚ Mt(eMt(e)>130GeV)>130GeV (E(Ett(e(e11)+ E)+ Ett(e(e22)+ E)+ Ett(j(j11)+ E)+ Ett(j(j22) >330 GeV) >330 GeV

DØ observe 0 events w/ 175 pb-1, expects 0.4±0.1Upper limit at 95%C.L MLQ>238 GeV

DØ observe 2 events w/ 175 pb-1, expects 4.7±0.9Upper limit at 95%C.L MLQ> 194 GeV

First generation LeptoQuarksFirst generation LeptoQuarks


Jets AnalysisJets Analysis jj channel (=1)

Two muons Two muons 2 jets 2 jets MMJJYY Remove events in the Z peakRemove events in the Z peak (E(Ett(j(j11)+ E)+ Ett(j(j22) ) > 85 GeV) ) > 85 GeV (P(Ptt((11)+ P)+ Ptt((22)) > 85 GeV)) > 85 GeV √ √ j(Ej(Ett ) )22+ + (P(Ptt))22>200 GeV >200 GeV

CDF observe 2 events w/~200 pb-1

CDF expects 3.15±0.17Upper limit at 95%C.LMLQ> 240 GeV (=1)

Second generation LeptoQuarksSecond generation LeptoQuarks


Jets + Missing Transverse Jets + Missing Transverse EnergyEnergy

jj channel (=0) 2,3 jets (2,3 jets (leading jets in central leading jets in central

regionregion)) MET>60 GeVMET>60 GeV Jets + MET not alignedJets + MET not aligned 80˚ <80˚ <(j,j)<165˚(j,j)<165˚ Veto on leptonsVeto on leptons

Observed 124 events w/ 198pb-1

Expects 118±14 events

Upper limit at 95%C.L 78< MLQ<117GeV

All generation LeptoQuarksAll generation LeptoQuarks


DØ has done a search Extra Dimensions Graviton is produced recoiling against a jet or Graviton is produced recoiling against a jet or

gluongluon Monojet like topologyMonojet like topology

JJ11 > 150 GeV, > 150 GeV,

JJ22 < 50 GeV, < 50 GeV,

MET > 150GeVMET > 150GeV

(Met,jet)> 30(Met,jet)> 30oo

Observe 63 events; expect 100 Observe 63 events; expect 100 ±6±7±6±7 in 85 pbin 85 pb-1-1

Signal Limit at 95% C.L.=Signal Limit at 95% C.L.= 84 events (expected limit 84 events (expected limit 128 128 ± 28 )± 28 )

Includes large energy scale uncertaintyIncludes large energy scale uncertaintyBoth MC and Data scalesBoth MC and Data scales

Efficiency: 20%Efficiency: 20%

Background: +50% and –30%Background: +50% and –30%

Statistical theory

Jet+Missing Transverse Jet+Missing Transverse EnergyEnergy

Kfactor=1


ConclusionsConclusions Tevatron is delivering record luminositiesTevatron is delivering record luminosities Detectors have collected ~200 pbDetectors have collected ~200 pb-1-1 of good of good

quality data until September 2003quality data until September 2003 Data analyzed with sensitivity to many modelsData analyzed with sensitivity to many models

Leptoquarks (first, second generations)Leptoquarks (first, second generations) Z’ models (E6, Little Higgs)Z’ models (E6, Little Higgs) Extra Dimension models (ADD, TeV-1, Randall-Extra Dimension models (ADD, TeV-1, Randall-

Sundrum)Sundrum) Excited electronsExcited electrons TechnicolorTechnicolor SUSYSUSY

Stay Tune for more to come from Tevatron Stay Tune for more to come from Tevatron soon!!!soon!!!


LQ summaryLQ summary


Tevatron performacesTevatron performacesTevatron successes in early 2004:

Record luminosity 6.8E31 3.9pb-1 integrated in a single

store First store w/ antiprotons from

Recycler


Dijet High Mass AnalysesDijet High Mass AnalysesL = 75 pb L = 75 pb -1-1

At least 2 jets , |At least 2 jets , ||<2|<2Reduce background: CosReduce background: Cos*<2/3*<2/3

Search for resonances in theinvariant mass of largest Et jetsspectrum. sensible to new physics

Particle 95% C.L. GeV

Axion/Coloron

200<M<1130 200<M<1130

Excited Quark

200<M<760200<M<760

E6 diquark 280<M<420280<M<420

W’ 300<M<410300<M<410

Technirho 260<M<640260<M<640


Dijet High MassDijet High Mass

With the same With the same invariant massinvariant mass

Search for Randall-Search for Randall-sundrum modelsundrum model

Exclude a region Exclude a region on the Mon the Mgravitongraviton K/MK/Mplpl plane plane

Sensitivity to highK/Mpl and MG mass

Excluded:jj: 220<MG<840 GeV (k/Mpl= 0.3)


More ee analysisMore ee analysis

ee invariant mass

Acceptance for Spin 1

Acceptance for Spin 0


More eeMore ee

Searches in dileptons ( Searches in dileptons ( cont’d)cont’d)


Dielectron eventMee = 371 Gev

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Non SUSY Searches at the Tevatron