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Title: Natural Little Hierarchy from Partially Goldstone Twin Higgs

Abstract

We construct a simple theory in which the fine-tuning of the standard model is significantly reduced. Radiative corrections to the quadratic part of the scalar potential are constrained to be symmetric under a global U(4) x U(4){prime} symmetry due to a discrete Z{sub 2} 'twin' parity, while the quartic part does not possess this symmetry. As a consequence, when the global symmetry is broken the Higgs fields emerge as light pseudo-Goldstone bosons, but with sizable quartic self-interactions. This structure allows the cutoff scale, {Lambda}, to be raised to the multi-TeV region without significant fine-tuning. In the minimal version of the theory, the amount of fine-tuning is about 15% for {Lambda} = 5 TeV, while it is about 30% in an extended model. This provides a solution to the little hierarchy problem. In the minimal model, the 'visible' particle content is exactly that of the two Higgs doublet standard model, while the extended model also contains extra vector-like fermions with masses {approx} (1 {approx} 2) TeV. At the LHC, our minimal model may appear exactly as the two Higgs doublet standard model, and new physics responsible for cutting off the divergences of the Higgs mass-squared parameter may not be discovered. Severalmore » possible processes that may be used to discriminate our model from the simple two Higgs doublet model are discussed for the LHC and for a linear collider.« less

Authors:
; ; ;
Publication Date:
Research Org.:
COLLABORATION - U.Arizona
Sponsoring Org.:
USDOE Director. Office of Science. High EnergyPhysics
OSTI Identifier:
929012
Report Number(s):
LBNL-59022
R&D Project: PTHOPS; BnR: KA1401020; TRN: US0803311
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Journal of High Energy Physics
Additional Journal Information:
Journal Volume: 1; Related Information: Journal Publication Date: 2006
Country of Publication:
United States
Language:
English
Subject:
72; BOSONS; FERMIONS; LINEAR COLLIDERS; PARITY; PHYSICS; RADIATIVE CORRECTIONS; SCALARS; STANDARD MODEL; SYMMETRY

Citation Formats

Chacko, Z, Nomura, Yasunori, Papucci, Michele, and Perez, Gilad. Natural Little Hierarchy from Partially Goldstone Twin Higgs. United States: N. p., 2005. Web.
Chacko, Z, Nomura, Yasunori, Papucci, Michele, & Perez, Gilad. Natural Little Hierarchy from Partially Goldstone Twin Higgs. United States.
Chacko, Z, Nomura, Yasunori, Papucci, Michele, and Perez, Gilad. 2005. "Natural Little Hierarchy from Partially Goldstone Twin Higgs". United States. https://www.osti.gov/servlets/purl/929012.
@article{osti_929012,
title = {Natural Little Hierarchy from Partially Goldstone Twin Higgs},
author = {Chacko, Z and Nomura, Yasunori and Papucci, Michele and Perez, Gilad},
abstractNote = {We construct a simple theory in which the fine-tuning of the standard model is significantly reduced. Radiative corrections to the quadratic part of the scalar potential are constrained to be symmetric under a global U(4) x U(4){prime} symmetry due to a discrete Z{sub 2} 'twin' parity, while the quartic part does not possess this symmetry. As a consequence, when the global symmetry is broken the Higgs fields emerge as light pseudo-Goldstone bosons, but with sizable quartic self-interactions. This structure allows the cutoff scale, {Lambda}, to be raised to the multi-TeV region without significant fine-tuning. In the minimal version of the theory, the amount of fine-tuning is about 15% for {Lambda} = 5 TeV, while it is about 30% in an extended model. This provides a solution to the little hierarchy problem. In the minimal model, the 'visible' particle content is exactly that of the two Higgs doublet standard model, while the extended model also contains extra vector-like fermions with masses {approx} (1 {approx} 2) TeV. At the LHC, our minimal model may appear exactly as the two Higgs doublet standard model, and new physics responsible for cutting off the divergences of the Higgs mass-squared parameter may not be discovered. Several possible processes that may be used to discriminate our model from the simple two Higgs doublet model are discussed for the LHC and for a linear collider.},
doi = {},
url = {https://www.osti.gov/biblio/929012}, journal = {Journal of High Energy Physics},
number = ,
volume = 1,
place = {United States},
year = {Thu Oct 20 00:00:00 EDT 2005},
month = {Thu Oct 20 00:00:00 EDT 2005}
}