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BSM p hysics: what can the Higgs tell us?. Matthew Brown, University of Southampton m.s.brown@soton.ac.uk ITEP Winter School, 14 th February 2013. Outline. Framework for SM Higgs Testing BSM theories Results for MUED Bélanger , Belyaev , Kakizaki , Pukhov [1209.0753 ]

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bsm p hysics what can the higgs tell us

BSM physics: what can the Higgs tell us?

Matthew Brown, University of Southampton

m.s.brown@soton.ac.uk

ITEP Winter School, 14th February 2013

outline
Outline
  • Framework for SM Higgs
  • Testing BSM theories
  • Results for
    • MUED Bélanger, Belyaev, Kakizaki, Pukhov[1209.0753]
    • 4DCHMBelyaev, Barducci, de Curtis, Moretti, Pruna[on arXiv!]
  • Conclusions and outlook
higgs production
Higgs production

Gluon-gluon fusion

87%

Higgs Strahlung

4.8%

√s = 8 TeV

Mh= 125 GeV

Vector boson fusion (VBF)

7%

Associate top production

0.58%

higgs production1
Higgs production

https://twiki.cern.ch/twiki/bin/view/LHCPhysics/CrossSections

higgs production2
Higgs production

https://twiki.cern.ch/twiki/bin/view/LHCPhysics/CrossSections

higgs decay
Higgs decay

h → 𝛾𝛾

h → ZZ → 4𝓁

(h → WW → 2𝓁2ν)

https://twiki.cern.ch/twiki/bin/view/LHCPhysics/CrossSections

higgs to two photons
Higgs to two photons

𝛾

𝛾

𝛾

𝛾

𝛾

𝛾

-7

4/3

  • SM-like particles don’t decouple as m → ∞
  • Particles which get mass from elsewhere do decouple

-7 : 3⨉(2/3)2 ⨉ (4/3)

-3.9 : 1

(amplitude level)

characterising the excess
Characterising the excess

CMS-HIG-12-045, conference note, Nov 2012

calculating
Calculating μ
  • If one production process dominates…
  • If several production processes are significant we mustbe told efficiencies!
minimal universal extra dimensions
Minimal Universal Extra Dimensions

Bélanger, Belyaev, Brown, Kakizaki, Pukhov [arxiv:1209.0753]

  • 1 extra dimension on S1/Z2orbifold (chiral interactions)
  • Action 5D Lorentz invariantat cutoff scale
  • KK photon is natural DM candidate
  • KK partners of SM vectors and fermions contribute to loops
  • gg → h enhanced; h → 𝛾𝛾 suppressed
  • R-1 is only new parameter
minimal universal extra dimensions1
Minimal Universal Extra Dimensions

𝛾

𝛾

𝛾

𝛾

𝛾

𝛾

𝛾

𝛾

𝛾

𝛾

constraining mued
Constraining MUED

95% CL limits on parameter space

Theoretical uncertainties due to radiative mass corrections

Bélanger, Belyaev, Brown, Kakizaki, Pukhov [arxiv:1209.0753]

constraining mued1
Constraining MUED

Bélanger, Belyaev, Brown, Kakizaki, Pukhov (2013) [arxiv:1209.0753]

4d composite higgs model
4D Composite Higgs Model

Barducci, Belyaev, Brown, De Curtis, Moretti, Pruna, in perparation

  • New strongly interacting sector possessing global symmetry
  • Symmetry is spontaneously broken
  • Four of the (pseudo) Nambu-Goldstone bosons form the SM Higgs doublet
  • Makes Higgs naturally light
  • New top- and bottom-like quarks and W’/Z’s. Also exotically charged quarks
conclusions
Conclusions
  • Higgs physics can place powerful constraints on BSM models
  • Model dependent tests must be performed to properly test plausible models of new physics
  • I am investigating Higgs physics of
    • MUED [1209.0753]
    • 4DCHM [on arXiv]
    • Technicolor models (Sasha, MadsFandsen, RoshanFoadi, TuomasHapola)
    • E6SSM (Belyaev, Svantesson, Pruna)
outlook
Outlook
  • Higgs couplings are poorly resolved at present, but will errors decrease with new data
  • Experimentalists will need to release more information (Likelihoods? Efficiencies?) as precision becomes important
higgs physics assumptions
Higgs physics assumptions
  • Negligible interference with background
  • Narrow-width approximation
    • Produce on-shell Higgs (PDFs become simple factors)
    • Multiply by decay branching ratio (BR) to find complete pp → h → XX cross-section
  • NWA → 1% error. Must go beyond when statistical errors fall

Kauer, arXiv:1201.1667

Kauer and Passarino, arXiv:1110.1613

excluding bsm models1
Excluding BSM models
  • For n ≫ 1…
  • Multiply likelihoods of different channels and experiments → sum exponents
minimal universal extra dimensions3
Minimal Universal Extra Dimensions

𝛾

𝛾

𝛾

𝛾

𝛾

𝛾

𝛾

𝛾

𝛾

𝛾