multi-higgs boson production and higgs couplings to the sm · sppc). a new quest to the mystery...
TRANSCRIPT
Multi-HiggsbosonproductionandHiggscouplingstotheSM
晏启树,UCASIncollaborationwith
KilianWolfgang,SichunSun,XiaoranZhao,ZhijieZhao,粒⼦物理前沿问题研讨会(⼲州),21-25/January/2019
Outline
• Introduction• EWHiggsinteractionsintheEFT• PerturbativeUnitarityconstraint• VBFHiggsbosonsproductionintheEFT• Conclusion
arXiv:1808.05534
ThoseweknowaboutHiggsBoson
Production,decay,quantumcorrections,…AgreementwiththeSM,but…
Thosewedonotknowuptonow
QuestionstotheHiggsboson
• What’stheoriginofHiggsboson’smass?• Isitcompositeorfundamental?• What’stheshapeofHiggspotential?• HowisEWsymmetrybroken?• WhetherthereisonlyoneHiggsboson?• CanEWbaryongensiswork?• …
Fundamental? Composite?
ToresolvethefinestructureofHiggsboson,moremeasurementsattheLHC,highprecisionandhighenergymachinesareneeded(Higgsfactory,ILC,FCC-ee/pp,CEPC/SPPC).Anewquesttothemysteryjustbegan.
AschematicviewtoEFTwithaHggsboson
SM
AfewTeV
100~200GeV
EFTwithAHiggs
Composite,SUSY,orothers
E
Bottom-upapproachModel-indepdent
Amodelcorrespondstoaspecificcornerofparameterspace
3PerturbativeUnitarityConstraint
4Multi-HiggsbosonfinalstateviaVBFProductions
ModelImplementinWhizard
ModelImplementinMadgraph
AgreementamongWhizard,Madgraph,andVBFNLOischecked.
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ResultsintheSM:gainswithcollisionenergyincrease
WeassumeotherparameterscanbedeterminedtobeclosetothoseoftheSM
[�0.01, 0.01] [�0.01, 0.01]
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we can determine trilinear coupling to [0.9,1.2] at a 100 TeV collider with an integrated luminosity 30/ab, similar to a precision!
that ILC (1 TeV, 4/ab) can achieve Q. Li, Z. Li, QY, X.R. Zhao, PRD92(2015)1,014015, arXiv:1503.07611
[-1.4,8.3]
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[-13,20]
C.Y. Chen,QY, X.R. Zhao, Z.J. Zhao, Y.M. Zhong, PRD93 (2016)1, 013007
EL for GF Processes(up to O(p6))
At leading order
[0.99,1.01] [0.9,1.1][-0.1,0.1]
gg ! hh
W. Kilian, S. Sun, X. Zhao, and Z. Zhao, JHEP1706,145(2017)
Effective Couplings at a 100 TeV collider
Higgs Quartic Couplings at a 100 TeV collider
[-0.8,1.3] [-2.3,1.5] [-13,20]
gg ! hhh
W. Kilian, S. Sun, X. Zhao, and Z. Zhao, JHEP1706,145(2017)
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Conclusion
• EFTisamodelindependentwaytodescribenewphysics.
• EFTwithaHiggsbosoncanserveasausefultooltoexplorethepotentialoftheLHCandfuturecolliders.
• HighenergyhadroncollidersandhighprecisionmachinescanofferusthecapabilitytoaddressthefundamentalquestionsabouttheHiggssectorattheTeVscale.
Backup
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F.Bishara,R.Contino,andJ.Rojo,EPJC(2017)77:481
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F.Bishara,R.Contino,andJ.Rojo,EPJC(2017)77:481
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