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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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_11266708_v2008_n4_p_Alvarez |
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todo:paper_11266708_v2008_n4_p_Alvarez2023-10-03T16:06:43Z Electroweak precision constraints on the Lee-Wick standard model Álvarez, E. Schat, C. Da Rold, L. Szynkman, A. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 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 |
JOUR |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_11266708_v2008_n4_p_Alvarez |
| work_keys_str_mv |
AT alvareze electroweakprecisionconstraintsontheleewickstandardmodel AT schatc electroweakprecisionconstraintsontheleewickstandardmodel AT daroldl electroweakprecisionconstraintsontheleewickstandardmodel AT szynkmana electroweakprecisionconstraintsontheleewickstandardmodel |
| _version_ |
1807323007506448384 |