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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2008
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_11266708_v2008_n4_p_Alvarez https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_11266708_v2008_n4_p_Alvarez_oai |
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I28-R145-paper_11266708_v2008_n4_p_Alvarez_oai2024-08-16 Álvarez, E. Schat, C. Da Rold, L. Szynkman, A. 2008 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. application/pdf http://hdl.handle.net/20.500.12110/paper_11266708_v2008_n4_p_Alvarez info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar J. High Energy Phys. 2008;2008(4) Beyond standard model Higgs physics Quark masses and SM parameters Standard model Electroweak precision constraints on the Lee-Wick standard model info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_11266708_v2008_n4_p_Alvarez_oai |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-145 |
| collection |
Repositorio Digital de la Universidad de Buenos Aires (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 Álvarez, E. Schat, C. Da Rold, L. Szynkman, A. 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. |
| format |
Artículo Artículo publishedVersion |
| author |
Álvarez, E. Schat, C. Da Rold, L. Szynkman, A. |
| author_facet |
Álvarez, E. Schat, C. Da Rold, L. Szynkman, A. |
| author_sort |
Álvarez, E. |
| 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 |
http://hdl.handle.net/20.500.12110/paper_11266708_v2008_n4_p_Alvarez https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_11266708_v2008_n4_p_Alvarez_oai |
| work_keys_str_mv |
AT alvareze electroweakprecisionconstraintsontheleewickstandardmodel AT schatc electroweakprecisionconstraintsontheleewickstandardmodel AT daroldl electroweakprecisionconstraintsontheleewickstandardmodel AT szynkmana electroweakprecisionconstraintsontheleewickstandardmodel |
| _version_ |
1809356831221350400 |