Implications for New Physics from Fine-Tuning Arguments: II. Little Higgs Models

Abstract

We examine the fine-tuning associated to electroweak breaking in Little Higgs scenarios and find it to be always substantial and, generically, much higher than suggested by the rough estimates usually made. This is due to implicit tunings between parameters that can be overlooked at first glance but show up in a more systematic analysis. Focusing on four popular and representative Little Higgs scenarios, we find that the fine-tuning is essentially comparable to that of the Little Hierarchy problem of the Standard Model (which these scenarios attempt to solve) and higher than in supersymmetric models. This does not demonstrate that all Little Higgs models are fine-tuned, but stresses the need of a careful analysis of this issue in model-building before claiming that a particular model is not fine-tuned. In this respect we identify the main sources of potential fine-tuning that should be watched out for, in order to construct a successful Little Higgs model, which seems to be a non-trivial goal.

39 pages, 26 ps figures, JHEP format

Cited by in corpus (47)

• Little Higgs Models and Their Phenomenology
• Electroweak Precision Constraints on the Littlest Higgs Model with T Parity
• Little-Higgs corrections to precision data after LEP2
• The Intermediate Higgs
• Bayesian approach and Naturalness in MSSM analyses for the LHC
• Supersymmetric Higgs and Radiative Electroweak breaking
• Little Higgs Models and Electroweak Measurements
• Double protection of the Higgs potential
• The Super-little Higgs
• Alternatives to an Elementary Higgs
• The Bestest Little Higgs
• A New Measure of Fine Tuning
• The health of SUSY after the Higgs discovery and the XENON100 data
• What is a Natural SUSY scenario?
• MSSM Forecast for the LHC
• T-Anomaly Induced LHC Signals
• Light pseudoscalar eta and H->eta eta decay in the simplest little Higgs mode
• Expectations for LHC from Naturalness: Modified vs. SM Higgs Sector
• The Minimally Tuned Minimal Supersymmetric Standard Model
• Exploring the heavy quark sector of the Bestest Little Higgs model at the LHC
• Naturalness of MSSM dark matter
• Bounds on the Simplest Little Higgs Model Mass Spectrum Through Z Leptonic Decay
• Production and decays of the light pseudoscalar boson $\eta$ at the LHC in the simplest little Higgs model
• The littlest Higgs is a cruiserweight
• Phenomenology of symmetry breaking from extra dimensions
• Associated production of a single heavy T-quark in the littlest and simplest little Higgs models
• Radiative Electroweak Symmetry Breaking in a Little Higgs Model
• Little Higgs models with a light T quark
• (Reverse) Engineering Vacuum Alignment
• Scalar Loops in Little Higgs Models
• Bayesian naturalness, simplicity, and testability applied to the $B-L$ MSSM GUT
• Research on the electromagnetic and weak dipole moments of the tau-lepton at the Bestest Little Higgs Model
• The Higgs effective potential in the Littlest Higgs model at the one-loop level
• Spontaneous CP-violation in the Simplest Little Higgs Model and its Future Collider Tests: the Scalar Sector
• Darkening the Little Higgs
• Histogram comparison as a powerful tool for the search of new physics at LHC. Application to CMSSM
• Radiative corrections to the Higgs potential in the LH model
• Reducing the fine-tuning of gauge-mediated SUSY breaking
• Low-mass neutralino dark matter in supergravity scenarios: phenomenology and naturalness
• On the electroweak symmetry breaking in the Littlest Higgs model
• A minimal Little Higgs model
• Simplest Little Higgs Revisited: Hidden Mass Relation, Unitarity and Naturalness
• Axion and PVLAS data in a Little Higgs model
• A heavy little Higgs and a light Z' under the radar
• Fine-Tuning in the 2HDM
• Electroweak Symmetry Breaking Beyond the Standard Model
• Spontaneous CP-violation in the Simplest Little Higgs Model