Electroweak precision constraints on the Lee-Wick standard model

We perform an analysis of the electroweak precision observables in the Lee-Wick Standard Model. The most stringent restrictions come from the S and T parameters that receive important tree level and one loop contributions. In general the model predicts a large positive S and a negative T. To reprodu...

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Autor principal: Szynkman, Alejandro Andrés
Publicado: 2008
Materias:
Beyond standard model
Higgs physics
Quark masses and SM parameters
Standard model
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11266708_v2008_n4_p_Alvarez
http://hdl.handle.net/20.500.12110/paper_11266708_v2008_n4_p_Alvarez
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_11266708_v2008_n4_p_Alvarez2023-06-08T16:08:08Z Electroweak precision constraints on the Lee-Wick standard model Szynkman, Alejandro Andrés Beyond standard model Higgs physics Quark masses and SM parameters Standard model We perform an analysis of the electroweak precision observables in the Lee-Wick Standard Model. The most stringent restrictions come from the S and T parameters that receive important tree level and one loop contributions. In general the model predicts a large positive S and a negative T. To reproduce the electroweak data, if all the Lee-Wick masses are of the same order, the Lee-Wick scale is of order 5 TeV. We show that it is possible to find some regions in the parameter space with a fermionic state as light as 2.4-3.5 TeV, at the price of rising all the other masses to be larger than 5-8 TeV. To obtain a light Higgs with such heavy resonances a fine-tuning of order a few per cent, at least, is needed. We also propose a simple extension of the model including a fourth generation of Standard Model fermions with their Lee-Wick partners. We show that in this case it is possible to pass the electroweak constraints with Lee-Wick fermionic masses of order 0.4-1.5 TeV and Lee-Wick gauge masses of order 3 TeV. Fil:Szynkman, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11266708_v2008_n4_p_Alvarez http://hdl.handle.net/20.500.12110/paper_11266708_v2008_n4_p_Alvarez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Beyond standard model
Higgs physics
Quark masses and SM parameters
Standard model
spellingShingle Beyond standard model
Higgs physics
Quark masses and SM parameters
Standard model
Szynkman, Alejandro Andrés
Electroweak precision constraints on the Lee-Wick standard model
topic_facet Beyond standard model
Higgs physics
Quark masses and SM parameters
Standard model
description We perform an analysis of the electroweak precision observables in the Lee-Wick Standard Model. The most stringent restrictions come from the S and T parameters that receive important tree level and one loop contributions. In general the model predicts a large positive S and a negative T. To reproduce the electroweak data, if all the Lee-Wick masses are of the same order, the Lee-Wick scale is of order 5 TeV. We show that it is possible to find some regions in the parameter space with a fermionic state as light as 2.4-3.5 TeV, at the price of rising all the other masses to be larger than 5-8 TeV. To obtain a light Higgs with such heavy resonances a fine-tuning of order a few per cent, at least, is needed. We also propose a simple extension of the model including a fourth generation of Standard Model fermions with their Lee-Wick partners. We show that in this case it is possible to pass the electroweak constraints with Lee-Wick fermionic masses of order 0.4-1.5 TeV and Lee-Wick gauge masses of order 3 TeV.
author Szynkman, Alejandro Andrés
author_facet Szynkman, Alejandro Andrés
author_sort Szynkman, Alejandro Andrés
title Electroweak precision constraints on the Lee-Wick standard model
title_short Electroweak precision constraints on the Lee-Wick standard model
title_full Electroweak precision constraints on the Lee-Wick standard model
title_fullStr Electroweak precision constraints on the Lee-Wick standard model
title_full_unstemmed Electroweak precision constraints on the Lee-Wick standard model
title_sort electroweak precision constraints on the lee-wick standard model
publishDate 2008
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11266708_v2008_n4_p_Alvarez
http://hdl.handle.net/20.500.12110/paper_11266708_v2008_n4_p_Alvarez
work_keys_str_mv AT szynkmanalejandroandres electroweakprecisionconstraintsontheleewickstandardmodel
_version_ 1768542518509568000

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