1. Hong-Jian He Tsinghua University
TeV Physics
with Polarized Linear Collider
Hong-Jian He
Tsinghua University
POSIPOL 2011 Workshop, Beijing, Aug 28-30, 2011

2. → can be Precisely Probed at LC !
LHC
LHC will Open the Door for
New Physics
→ can be Precisely Probed at LC !

3. LHC results will guide the way
Now: LHC ...
Next: LC…...
LHC results will guide the way
at energy frontier !

4. Exciting Journey of LHC ……
2009: First beam circulating in LHC on Nov-20.
Nov-23: First collison at √s = 900GeV.
Dec-8,14,16: First collisions at √s = 2.36TeV － World Record !
Dec-16－Feb.26: Technical stop.
2010: Machine operation started again on Feb.26.
March.19: First single beams ramped up to 3.5TeV.
March.30: First collision at = 7TeV, and data taking…
End of July: First results presented at HEP conference.
2011:
March-24: after 1 month running, accumulated 50/pb,
equal to 50% of total luminosity in whole 2010 !
End of June: ATLAS/CMS reached /fb luminosity !!
Goal: Reach 5-8/fb by the end of 2012 !!!

5. LHC: 2011 Integrated Luminosity
Initial Goal-2011

6. Re-discover SM !
But sadly not SUSY…..
ATLAS: arXiv:

7. is largely fine-tuned: Bound on Gluino Mass M3 > 780GeV
“Fine-Tuning Price of Early LHC”: A. Strumia, JHEP 04 (2011) 073
SUSY CMSSM
parameter space
is largely fine-tuned:
Bound on Gluino Mass
M3 > 780GeV
requires 2% fine-tuned cancellation!

8. Key Questions of Particle Physics
Gravity Assisted Unification
He et al, PRD2011
Origin of Electroweak Symmetry Breaking, or Origin of Mass/Matter
Unification of forces
Fundamental Symmetry of Forces and Matter
Why not Antimatter
Unification of quantum physics and General Relativity
Number of Spacetime Dimensions
What is Dark Matter
What is Dark Energy
For Most Questions,
New Particles will appear at
TeV Scale or Below
To be Probed by LHC + LC !!!

9. All SM Particles: Area of circle ∝ Particle-Mass Only Top, W/Z and Higgs stand out !
Mass Puzzle

11. It is often said that LHC is just to find a light fundamental Higgs Boson.
BUT, this is a quite misleading statement －
1. Higgs Boson may be heavy.
2. Higgs may be more than one and charged.
3. Higgs Boson may be composite.
4. Higgs Boson may Not exist at all.
5. Smoking-Gun Signals other than Higgs.

12. ★ Possibility of Heavy Higgs or No Higgs is fully open !
Gian Giudice (CERN), talk on ; M. Chanowitz, PRD66(2002)073002
The two best measurements of
sin2W do not agree :
NO compelling evidence for
Light Higgs Boson even in SM !
★ Possibility of Heavy Higgs or No Higgs is fully open ! 12 12

13. Heavy Higgs vs Precision Data: No Problem
Heavy Higgs vs Precision Data: No Problem ! Top is special —Large t Mass may trigger EWSB !
HJH et al, Top-Seesaw Composite Higgs: MH ≈ GeV
Top Seesaw Model

14. TeV Scale (far) beyond 2010 Great opportunities ahead at TeV Scale
Rolf Heuer LP-2011
new physics around 2011/12 ?
(HL)-LHC
HE-LHC ?
TDR/CDR 2011/12
CDR in 2011
Great opportunities ahead at TeV Scale
1st Opportunity for Decision
on the way forward around 2012 (?)

15. A Roadmap for TeV Lepton Colliders Normal/Super conducting
T. Raubenheimer, EPS 2011

16. Production e-e+ →WWZ: Unpolarized vs Polarized Beams
(Han, He, Yuan)
Polarized
LC (ee)
500GeV

17. Unpolarized, Polarized, and Increasing c.m. Energy
Production e-e+ →WWZ:
Unpolarized, Polarized, and Increasing c.m. Energy
(Han, He, Yuan)

18. Cross Section at γγ
collider is 1-2 orders larger than that of ee collider!

19. Right-handedly polarized γγ collider → H+ in TopC model !
Polarized γγ collider can determine chirality of H+ Yukawa coupling → discriminate New Physics Models:
Right-handedly polarized γγ collider → H+ in TopC model !
He, Kanemura, Yuan, PRL2002, PRD2003

20. Left-handedly polarized γγ collider → H+ in SUSY model !
He, Kanemura, Yuan, PRL2002, PRD2003

21. Laser beam is left-handedly polarized.
e beam is right-handedly polarized.
He, Kanemura, Yuan, PRL2002, PRD2003

22. For τνH+ Production at ee and γγ colliders:

23. For τνH+ Production at Polarized γγ collider:
He, Kanemura, Yuan, PRL2002, PRD2003

24. Road beyond Standard Model
Next decades
Road beyond Standard Model
LHC results crucial for decisions
at Energy Frontier !
At the energy frontier through synergy of
hadron - hadron colliders (LHC, HE-LHC?)
lepton - hadron colliders (LHeC ??)
lepton - lepton colliders (LC (ILC or CLIC)?)
(μ-collider ???)

25. Conclusions:
LHC results will
guide the Way at
Energy Frontiers !
and LCs……
LCs: Beam Polarization is Important
for probing New Physics !!!

26. Thank You ! Let’s get prepared for —
New Surprises from LHC, and then LC…！
Thank You !