SUSY Searches at the Tevatron

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SUSY Searches at the Tevatron

• Mario Paolo Giordani
• Università degli Studi di Udine INFN Trieste
• IFAE 04 Torino (Italy)
• April 14th, 2004

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Outline

• Accelerator performance
• Tevatron detectors
• Higgs sector
• Classical missing ET
• Third generation sfermions
• Trilepton-based
• Photonmissing ET
• CHAMPs
• High tan? scenario
• Indirect searches

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Tevatron performance

• Excellent performance in 2004
• 450pb-1 delivered in RunII
• 300(DØ) to 350(CDF) pb-1 on tape
• 200 to 250pb-1 analyzed by each experiment

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CDF DØ
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No SUSY without Higgs

• Dynamics for electroweak symmetry breaking still
  unknown
• Low-energy SUSY provides viable SM extension
  predicting light Higgs boson
• SUSY Higgs sector richer than SM
• 5 Higgs states h,H,A0,H
• upper bound on mh

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SM Higgs

• LEP2 mHgt114.4GeV/c2 _at_95C.L.
• Tevatron will need time luminosity
• even if light Higgs seems to be favoured

mH117GeV/c2
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MSSM Higgs

• MSSM reach inferred from SM Higgs

maximal stop mixing
effect of upper bound on mh wide exclusion
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MSSM Higgs 4b-jets

• Powerful signature
• require at least 3 b-tags out of 3 or 4 jets
• suppressed by stop mixing

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Missing ET Signature

• Best squark/gluino sensitivity
• Jets from cascade decays ? moderate ET jets
• Missing ET from multiple sources ? moderate
  missing ET
• need full understanding of detector!

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Squarks and gluinos

• Getting into new region
• Mapping work in progress

CDF D0 Run I
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Gluino Decay into Sbottom

• Large production cross-section
• Possible decays (but heavy)
• (but
  heavy)
• Striking signature 4b-jetsmissing ET
• 1 or 2 b-tags out of at least 3 jets

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Gluino Decay into Sbottom

• Main backgrounds mistags and
• expected (1b-tag),
  (2b-tag)
• observed 4 single and 1 double b-tagged evts

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Lepton-based Signatures

• Trilepton-based chargino-neutralino
• Very clean, convincing proof of SUSY
• mSUGRA prediction at reach

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Like-Sign Dileptons

• Release third lepton request
• Increase acceptance
• LS requirement for background rejection

95C.L. excluded
forbidden
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DiPhotonMissing ET

• Gravitino LSP?NLSP is or
• if neutralino NLSP
• SUSY signatures complemented by ??

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GMSB SUSY

• DØ sets
• improves LEP limits!
• CDF results with 200pb-1 coming soon

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CHArged Massive Particles

• Charged massive particles
• predicted by many models
• stable or gauginos
• due to couplings kinematic constraints
• stable ? escape detector
• massive ? slowly moving
• Use TOF data
• ?TOF wrt particle speedc
• signal ?TOFgt2.5ns
• Stable stop (NLSP)

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SUSY _at_ high tan?

• Standard trilepton
• with
• For tan?gt8
• ? becomes important
• trilepton
• A???
• New tools
• leptontrack triggers
• progress on ? id
• see E. Vatagas talk

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SUSY in B Decays

• Enticing probe for SUSY
• SM no FCNC _at_ tree level
• BR(Bs???)3.410-9
• SUSY corrections boosts decay
• CKM-suppressed
• Discriminating variables
• M?? , c? , ??(dimuon,vertex) isolation

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Bs/d???-

• CDF 95 C.L. limits
• BR(Bs???)7.510-7
• BR(Bd???)1.910-7
• DØ 95 C.L. expected limit
• BR(Bs???)1.010-6

world best
CMX not included
expected background 1.070.31 1.050.30
box not yet open
expected background 7.3
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Conclusions

• Tevatron running at worlds highest energy
• Luminosity records resulting in 0.3fb-1 of
  physics quality data accumulated
• RunII SUSY limits approaching and surpassing
  LEPII
• Searching for SUSY in a large variety of channels
• Hope to see first signs or even discover SUSY
  before LHC
• See S.Rollis talk for more Tevatron results