Collider Phenomenology of SUSY Cosmic Connections & Jin Min Yang Institute of Theoretical Physics, CAS IHEP 2006.12.14

目 录 1、Introduction to SUSY 2、Fine-tuning & SUSY 3、GUT & SUSY 4、Dark Matter & SUSY 5、 SUSY at Colliders 6、Conclusion

1、Introduction 1.1 What is SUSY ? Why SUSY ? SUSY |B |F

History: At end of 60‘s: SUSY proposed from math logic At beginning of 70’s: physics model Has been hot for 30 years; 30000 papers Why ? SUSY SUSY SUSY

Fine Tuning Dark Matter GUT SUSY Inflation Electroweak Baryogenesis Affleck-Dine Baryogenesis

SUSY is physics？ How heavy ？ Accessible at LHC？ ??? SUSY

1.2 SUSY Models R-parity R-parity

MSSM NMSSM Singlet S

MSSM mSUGRA

mSUGRA

SUSY breaking mechanisms

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

2. Fine-tuning & SUSY 1019 GeV 1015 GeV GUT Fine-tuning 1 TeV SM break 100 GeV Weak Scale

Bare 100 GeV 2

In SUSY: 2 cancel remain How heavy ? Depends on

More about Higgs mass: EW baryogenesis:

3. GUT & SUSY not sensitive to sfermions light gauginos/higgsino (??) SM

GUT sfermions gauginos/higgsino Maybe unaccessible at LHC Light ! Not necessarily so light for LHC

4. Dark Matter & SUSY

Dark Matter Mass: weak-scale Interaction: weak-scale WIMP

Which one is LSP dark matter ?

LSP (Dark Matter)

mSUGRA

Split-SUSY

Dark Matter sfermions gauginos/higgsino Maybe heavy Maybe unaccessible at LHC Dark Matter sfermions gauginos/higgsino Light ! Most likely accessible at LHC

5、SUSY Search at Colliders LEP (I, II) Tevatron I closed Tevatron II on-going LHC up-coming ILC imagining

LEP (I, II) SUSY Tevatron (I,II)

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

Tevatron stop -> b l snu stop -> c chi stop -> c chi

Future Colliders International Linear Collider (ILC)

LHC ILC

Find a needle in a haystack！ LHC ILC Find a needle in a haystack！ 1/10 billions

LHC: discover ILC: precison test

LHC: SUSY Typical Signature

b-jet b ET b b-jet ET

LHC

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

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

LHC TeV-scale SUSY mSUGRA

LHC Dark Matter Constraint

? 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

Split-SUSY + pp  - 1 1 e+e-  + - 1 1

LHC Higgs bosons sparticles SM  weak-scale SUSY   ??     ?? h H, A, H　　 sfermions gaugino/Higgsino SM  weak-scale SUSY   ??     ?? Split-SUSY

weak-scale SUSY LHC ILC discover Predict dark matter Precision test Predict dark matter ILC

6、Conclusion E. Witten 2002, Beijing

Thanks！