low energy susy in light of lhc higgs data
DESCRIPTION
Low Energy SUSY in light of LHC Higgs Data. Jin Min Yang. ( ITP, Beijing ). 上海交通大学. 2013.6.4. Outline. 1 Introduction to Higgs & SUSY. LHC Higgs Data. The nature of Higgs. BBC News. Nov 19, 2012. Higgs indicates SUSY. SUSY may not be dead, but these - PowerPoint PPT PresentationTRANSCRIPT
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Low Energy SUSY in light of LHC Higgs DataLow Energy SUSY in light of LHC Higgs Data
(( ITP, BeijinITP, Beijingg ))
Jin Min YangJin Min Yang
2013.6.4
上海交通大学
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OutlineOutline
3 Conclusion3 Conclusion
1 Introduction to Higgs & SUSY1 Introduction to Higgs & SUSY• LHC Higgs DataLHC Higgs Data
• The nature of Higgs The nature of Higgs
• Higgs indicates SUSYHiggs indicates SUSY
• SUSY and modelsSUSY and models
• Status of some SUSY modelsStatus of some SUSY models
2 Status of low energy SUSY2 Status of low energy SUSY
• Further probes of SUSYFurther probes of SUSY
BBC News Nov 19, 2012
SUSY may not be dead, but these
latest results have certainly put
it into hospital
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• Higgs production at LHC:
• Higgs decays:
1 Introduction to Higgs & SUSY 1 Introduction to Higgs & SUSY
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Red ( Moriond )
Black ( Dec,2012 )
• LHC Higgs Data
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Nima Arkani-Hamed
• If the Higgs turns out to have spin two, he’ll quit physics.
• If the Higgs turns out to be a techni-dilaton, he’ll kill himself.
• • • • • • • • •
So far, we can say Higgs has been discovered.So far, we can say Higgs has been discovered.
The newly discovered particle:The newly discovered particle:
can it be spin-2 ? can it be spin-2 ?
can it be CP-odd ?can it be CP-odd ?
can it be a dilaton ?can it be a dilaton ?
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Goldstone Boson
(massless)
Higgs Boson
(massive)
Spontaneous Symmetry Breaking
eaten by guage boson
Massive Gauge Boson
The nature of Higgs boson:
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a light fundamental Higgs boson
indicates SUSY
Why ?
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Mh < 135 GeV in MSSM
Mh < 150 GeV in any low energy SUSY model
In SM Higgs mass is a free parameter
Higgs mass 125 GeV --- signal of SUSY
Reason-1:
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SM 100 GeV
1 TeV SUSY
1015 GeV GUT
2 /52100 GeV bare
If SM valid up to GUT scale, the theory
has extreme fine-tuning !
1693 , Newton‘Gravitation law consistent with static universe ?’
Fine-tuning ProblemReason-2:
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125 GeV Higgs --- vacuum not stable --- need SUSY
Reason-3:
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Edward Witten
(Higgs-related)
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What is SUSY ? What is SUSY ?
Edward Witten
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CMSSM/mSUGRAGMSB, AMSB, ···
SUSY
MSSM
, NM
SSM,
nMSSM
, pMSSM
R-v
iola
ting
S
USY
SUSY models on the market:
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• Dynamical solution to -problem
• Solve little hierarchy problem
Why NMSSM ?
• Theoretically motivated
E6 models (superstring-inspired)
SO(10) U(1) …
string scale
at low energy: S, Hu, Hd + heavy particles
U(1) global PQ
to break U(1) PQ(NMSSM)
tadpole (nMSSM)
cubic term
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2 Status of low energy SUSY
• Consider various SUSY mdoels
• Consider all experimental constraints, scan the parameter space
• Examine the allowed parameter space
arXiv:1207.3698; 1202.5821
Cao, Heng, Yang, Zhu
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diphoton:
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ZZ*:
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All channels:
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More about CMSSM/mSUGRA:
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So, confronted with LHC data:
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Further Probes of SUSY
Through measuring Higgs couplings:arXiv:1207.3698;
Cao, Heng, Yang, Zhu
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Yukawa couplings to top and bottom
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Through dark matter detection:
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light dark matter (8-10 GeV) ? arXiv:1104.1754
Cao, Hikasa, Wang, Yang
NMSSM
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May 17, 2013
CDMS talk at FNAL
(by E. Figueroa-Feliciano)
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arXiv:1206.3865
Cao, Han, Wu, Yang, Zhang
Search for stop pair at LHC:
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Study Z versus at LHC:
arXiv:1301.4641
Cao, Wu, Wu, Yang
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Study Higgs pair production at LHC:
arXiv:1301.6437
Cao, Heng, Shang, Wan, Yang
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Think about Higgs-factory:
C.Han, L.Wu, P.Wu, JMY,
work in progress
SUSY
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How about Z-factory ?
JMY, arXiv: 1006.2594
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3 Conclusion
Confronted with LHC Higgs data:
• Some SUSY models are healthy
• Some SUSY models need to be sent to hospital
LHC, HL- LHC, Higgs factory can further probe SUSY:
• Through measuring Higgs couplings
• Through some rare processes (hh, Z… )• Through stop pair production
Dark matter detection expt (XENON) can interplay
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After all,
when and where
can SUSY be discovered?
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Where ? Edward Witten
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On SUSY, Frank Wilczek is still a believer, based on the renormalization
group calculation he was a co-author of back in 1981. If no SUSY turns
up at the next LHC run though, even he will throw in the towel:
I cannot believe this success is an accident. But in science faith is a
means, not an end. Supersymmetry predicts new particles, with
characteristic properties, that will come into view as the LHC operates
at higher energy and intensity. The theory will soon undergo a trial by
fire. It will yield gold – or go up in smoke.
He has a bet with Garrett Lisi that superparticles will be detected by
July 8, 2015.
Frank Wilczek
When ?
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Thanks