Exotica Searches From DØ - Florida State University
Exotica Searches from DØTodd AdamsFlorida State UniversityMC4BSM-4, UC Davis, April 3-4, 2009
Outline Standard SUSY– squarks and gluinos– trileptons Non-standard SUSY– RPV sneutrinos Standard Non-SUSY – ED, LED– compositeness– leptoquarks/T-odd quarksExotic BSM– stopped gluinos– NLLP in dimuons– CMSP General Searches– MISApril 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams2
Fermilab Operations 6 fb-1 delivered 5 fb-1 recorded 90% efficiencyApril 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams3
The DØ DetectorApril 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams4
Standard SUSYSquarks and gluinosTrileptons
Supersymmetry Supersymmetry is one of our most theoretically investigatedBSM models Also numerous experimental searches But we often explore only part of SUSY phase space Examples:– models with reduced parameters (GMSB, mSUGRA, etc)– models with R-parity conservation – dark matter candidateApril 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams6
Squarks and Gluinos2.1 fb-1 Large crosssection High pT jets MET mSUGRA Don’t wantto dependupon QCDsimulation Find regionwith SMQCD 0April 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams7
Squarks and Gluino LimitsExpectedData“di-jet”11.1 3.111“3-jets”10.7 3.29“gluino”17.7 5.6202.1 fb-1 Excellent limits byremoving SM QCDevents Remaining eventsdescribed by other SMprocessesPLB 660, 449 (2008)April 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams8
Trileptons2.3 fb-1 Associated production ofchargino neutralino Signature is– three leptons– missing energy “Golden” channel– small SM contributions mSUGRA some areas of SUSY space arechallenging find two leptons plus anisolated trackApril 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams9
Trilepton Limits2.3 fb-1arXiv.org:0901.0646April 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams10
Other Standard SUSY Searches stop in dileptonsstop in c METstop in top admixturesbottomGMSB in diphotonsApril 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams11
Non-Standard SUSYRPV sneutrinos
RPV Sneutrinos4.1 fb-1 If R-parity is not conserved Search in e mu final state No evidence of signalBackground: 144.9 8.3Data:143Limits oncross-sectiontimes BRandcouplingsApril 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams13
Other Non-Standard SUSY RPV violation in trileptons Slepton production See some other searches later in this talkApril 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams14
Standard Non-SUSYSignaturesExtra dimensionsLeptoquarksT-odd Quarks
Extra Dimensions Extra dimension models generally address theweakness of gravity Can produce experimental signaturesqgggqGKKgGKKmono-jet or mono-photonApril 3, 2009ffGKKfVGKKfVfermion pairsExotica at D0 - MC4BSM-4, UC Davis - T. Adams16
LED in Monophoton2.7 fb-1 Search for evidence ofKaluza-Klein gravitons Single photon and largemissing ET Challenging backgrounds––––ZγÆννγ (irreducible)WÆeνmis-identified jetscosmics Control non-physicsbackgrounds via DCAdistributionApril 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams17
LED in monophotonApril 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams2.7 fb-118
LED in di-EMffGKKf2.3 fb-1VGKKfV ED can lead to anenhancement in fermionproduction and amodification of angulardistribution Search in di-electron diphoton high mass tailPRL 102, 051601 (2009),April 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams19
Dijet Angular Distributions0.7 fb-1 Investigate dijet angular distributions New physics would modify from SM– compositeness– ADD extra dimensions– TeV-1 extra dimensions Measure χdijet as a function of Mjjχ dijet exp( y1 y2 ) use simulation for corrections to particle jets look for new physicsσ NP f SM η f Int η 2 f NPApril 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams20
Dijet Angular DistributionsApril 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams0.7 fb-121
Limits from Dijets 0.7 fb-1Expected(TeV)Observed(TeV)Compositeness (Λ)λ 1λ -12.75 0.43-0.352.78 0.36-0.412.582.54TeV-1 ED (MC)1.64 0.23-0.251.42ADD LED (MS)GRWHLZ n 61.49 0.12-0.141.25 0.11-0.101.561.31Bayesian limits with prior flat in ηother limits availableApril 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams22
T-odd Quarks/Leptoquarks Some little Higgs models postulate a new symmetry– T-parity T-odd quarks could produce signal in jets MET– convert squarks and gluinos search Could also be leptoquarksdecaying to νqPLB 668, 357 (2008)April 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams23
Other Standard Non-SUSYSignatures Leptoquarks––––1st generation in ejej and ejνj2nd generation in μjμj and μjνj3rd generation in μjτj and νbνball generation in νjνj (previous slide) Extra gauge bosons– W’ Æ eν– W’ Æ tb– Z’ Æ ee or μμ Excited quarks and leptons Compositeness in ee and μμApril 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams24
Non-standard SignaturesStopped GluinosLong-lived ParticlesCharged, massive stable particles
Stopped Gluinos Split supersymmetryGluino hadronizesStops within calorimeterDecays sometime later toneutralino gluon– minutes, hours, days Look for calorimeteractivity not associated withinteraction– Veto on reconstructedprimary vertex– “Wide” showersApril 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams26
Gluino Signal Simulation0.4 fb-1 Z g Æ νν g– randomly oriented in calorimeter– sinθ distribution depends on gluino mass, neutralinomass, and gluino lifetimedependence on neutralino massApril 3, 2009dependence on lifetimeExotica at D0 - MC4BSM-4, UC Davis - T. Adams27
Neutral Long-lived Particles0.4cfb-1 Search for events with VERY detached di-muonvertices: 5-20 cm in x-y plane– study vertexing with KS Possible signatures– RPV SUSY or hidden valleysPRL 668, 357 (2008 No events observed with 0.75 1.1 events expectedApril 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams28
Charged, Massive Stable Particles Search for slow-moving, muon-like particles in D0 detector β 1 use timing in muon system– large distance– measure speedsignificance1 βσβ1.1cfb-1April 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams29
CMSP Limits1.1 fb-1 Several models considered– GMSB stau (a)– AMSB-inspired gaugino-like chargino (b) higgsino-like chargino (c)arXiv.org:0809.4472April 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams30
General Searches
Model Independent Search1 fb-1 “Global” search of D0 data with leptonsHigh-pTSelectevents withone of morehigh-pTleptonsApril 3, 2009MISVistaDeterminescale factorsCompare 10khistograms(normalization& shape)7 nonoverlappinginclusivestates180 exclusivefinal statesExotica at D0 - MC4BSM-4, UC Davis - T. AdamsSleuthInvestigate highpT tailsMET ΣpTCombine states(example:e e- μ μ- Æℓ ℓ-)32
Model Independent Search1 fb-1 Vista Results––––μ 2j MET 9.3σμ γ 1j MET 6.6σμ μ- MET 4.4σμ μ- γ4.1σ Sleuth Results––––––five most discrepant statesℓ ℓ′- METℓ METℓ ℓ′ℓ τ- METℓ τ April 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams33
Comments on Simulation DØ often uses data to model multijet background– less faith in QCD Monte Carlo than CDF– multijet modeled from events with non- or nearly- isolatedleptons Some BSM signatures simulated with “fudged”Monte Carlo– examples: long-lived particles Other signals considered– examples: hidden valleys, magnetic monopoles, quirksApril 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams34
Conclusions DØ has a diverse physics program searching for newphysics It will continue with more data arriving daily Still looking to explore new ideas– greatest discovery sults.htmApril 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams35
The QuestionsWhat new BSM results does D0 have?How are we using our Monte Carlo?What SM Monte Carlo needs do we have?What BSM Monte Carlo needs do we have?April 3, 2009Exotica at D0 - MC4BSM-4, UC Davis - T. Adams36
April 3, 2009 Exotica at D0 - MC4BSM-4, UC Davis - T. Adams 34 Comments on Simulation DØ often uses data to model multijet background – less faith in QCD Monte Carlo than CDF – multijet modeled from events with non- or nearly- isolated leptons Some BSM signatures simulated with “fudged” Monte Carlo – examples: long-lived particles Other signals considered
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