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Collider Phenomenology of SUSY Cosmic Connections &
Jin Min Yang Institute of Theoretical Physics, CAS IHEP
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目 录 1、Introduction to SUSY 2、Fine-tuning & SUSY 3、GUT & SUSY
4、Dark Matter & SUSY 5、 SUSY at Colliders 6、Conclusion
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1、Introduction 1.1 What is SUSY ? Why SUSY ? SUSY |B |F
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History: At end of 60‘s: SUSY proposed from math logic
At beginning of 70’s: physics model Has been hot for 30 years; papers Why ? SUSY SUSY SUSY
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Fine Tuning Dark Matter GUT SUSY Inflation Electroweak Baryogenesis Affleck-Dine Baryogenesis
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SUSY is physics？ How heavy ？ Accessible at LHC？ ??? SUSY
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1.2 SUSY Models R-parity R-parity
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MSSM NMSSM Singlet S
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MSSM mSUGRA
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mSUGRA
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SUSY breaking mechanisms
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Fine-tuning GUT Dark Matter TeV-Scale SUSY Split-SUSY
all sparticles < TeV TeV-Scale SUSY 1 < 130 GeV 5 Higgs bosons 4 < TeV Fine-tuning GUT Dark Matter Gauginos/Higgsinos < TeV sparticles Others：superheavy Split-SUSY 1 < 150 GeV Higgs Bosons 4 ：superheavy
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2. Fine-tuning & SUSY 1019 GeV 1015 GeV GUT Fine-tuning 1 TeV
SM break 100 GeV Weak Scale
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Bare 100 GeV 2
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In SUSY: 2 cancel remain How heavy ? Depends on
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More about Higgs mass: EW baryogenesis:
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3. GUT & SUSY not sensitive to sfermions light gauginos/higgsino (??)
SM
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GUT sfermions gauginos/higgsino Maybe unaccessible at LHC Light !
Not necessarily so light for LHC
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4. Dark Matter & SUSY
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Dark Matter Mass: weak-scale Interaction: weak-scale WIMP
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Which one is LSP dark matter ?
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LSP (Dark Matter)
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mSUGRA
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Split-SUSY
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Dark Matter sfermions gauginos/higgsino Maybe heavy
Maybe unaccessible at LHC Dark Matter sfermions gauginos/higgsino Light ! Most likely accessible at LHC
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5、SUSY Search at Colliders
LEP (I, II) Tevatron I closed Tevatron II on-going LHC up-coming ILC imagining
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LEP (I, II) SUSY Tevatron (I,II)
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tan > 2 LEP mh , mA ,mH > 95 GeV 103.5 GeV < chargino
47 GeV < neutralino Selectron > 100 GeV Smuon > 97 GeV 100 GeV < squark Stau > 93 GeV 100 GeV < stop 100 GeV < sbottom
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Tevatron stop -> b l snu stop -> c chi stop -> c chi
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Future Colliders International Linear Collider (ILC)
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LHC ILC
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Find a needle in a haystack！
LHC ILC Find a needle in a haystack！ 1/10 billions
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LHC: discover ILC: precison test
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LHC: SUSY Typical Signature
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b-jet b ET b b-jet ET
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LHC
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squarks sfermions sleptons Sparticles gauginos gluino Higgsinos
What SUSY partilces can be found at LHC? h, H (CP-even) Higgs Bosons A (CP-odd) H squarks sfermions sleptons Sparticles gauginos Higgsinos gluino charginos neutralinos
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LHC only see LEP II excluded Depends on good detection capabilities
for b’s and tau’s only see Gold -plated signal LEP II excluded
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LHC TeV-scale SUSY mSUGRA
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LHC Dark Matter Constraint
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? MSSM sfermion sparticle gaugino higgsino Split SUSY h, H Higgs A, H
many all at least h sfermion several sparticle h, H Higgs gaugino higgsino A, H ? maybe no only h Split SUSY
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Split-SUSY + pp - 1 1 e+e- + - 1 1
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LHC Higgs bosons sparticles SM weak-scale SUSY ?? ??
h H, A, H sfermions gaugino/Higgsino SM weak-scale SUSY ?? ?? Split-SUSY
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weak-scale SUSY LHC ILC discover Predict dark matter Precision
test Predict dark matter ILC
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6、Conclusion E. Witten 2002, Beijing
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Thanks！
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