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Tadpole-Induced Electroweak Symmetry Breaking and pNGB Higgs Models

Mar 11, 2016

21 pages

Published in:

JHEP 03 (2017) 111

Published: Mar 22, 2017

e-Print:

1603.03772 [hep-ph]

DOI:

10.1007/JHEP03(2017)111

Report number:

FERMILAB-PUB-16-076-T

View in:

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Abstract: (Springer)

We investigate induced electroweak symmetry breaking (EWSB) in models in which the Higgs is a pseudo-Nambu-Goldstone boson (pNGB). In pNGB Higgs models, Higgs properties and precision electroweak measurements imply a hierarchy between the EWSB and global symmetry-breaking scales, v

_{H}

≪ f

_{H}

. When the pNGB potential is generated radiatively, this hierarchy requires fine-tuning to a degree of at least ∼ v

_{h}^{2}

/f

_{H}^{2}

. We show that if Higgs EWSB is induced by a tadpole arising from an auxiliary sector at scale f

_{Σ}

≪ v

_{H}

, this tuning is significantly ameliorated or can even be removed. We present explicit examples both in Composite Higgs models based on SO(5)/SO(4) and in Twin Higgs models. For the Twin case, the result is a fully natural model with f

_{H}

∼ 1 TeV and the lightest colored top partners at 2 TeV. These models also have an appealing mechanism to generate the scales of the auxiliary sector and Higgs EWSB directly from the scale f

_{H}

, with a natural hierarchy f

_{Σ}

≪ v

_{H}

≪ f

_{H}

∼ TeV. The framework predicts modified Higgs coupling as well as new Higgs and vector states at LHC13.

Note:

21 pages, 5 figures

Beyond Standard Model
Higgs Physics
Technicolor and Composite Models
new physics
naturalness
electroweak interaction: symmetry breaking
twin Higgs model
Higgs model: composite
SO(5)/SO(4)
Higgs particle: Goldstone particle

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