Electroweak precision constraints on the Lee-Wick Standard Model

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dc.creatorAlvarez, Ezequiel
dc.creatorDa Rold, Leandro
dc.creatorSchat, Carlos
dc.creatorSzynkman, Alejandro
dc.date2008-02-07
dc.date.accessioned2026-07-07T11:14:11Z
dc.date.available2026-07-07T11:14:11Z
dc.descriptionWe 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.
dc.description24 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/0802.1061
dc.identifierhttp://arxiv.org/abs/0802.1061
dc.identifierJHEP0804:026,2008
dc.identifierdoi:10.1088/1126-6708/2008/04/026
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/191980
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleElectroweak precision constraints on the Lee-Wick Standard Model
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