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New heavy resonances : from the electroweak to the planck scale

Abstract : The principle of local gauge invariance is a pillar of modern particle physics theories and in the SM relies on the ad-hoc gauge group structure SU(3)_c x SU(2)_L x U(1)_Y. Extending this gauge group is very well motivated in a Grand Unified Theory (GUT) perspective in which the SM is the low-energy limit of a more fundamental theory based on a larger gauge group like SO(10) or E(6). Indeed, the symmetry breaking (SB) of the underlying GUT gauge group, down to the SM one, leaves some additional group factors unbroken, such as U(1) or SU(2). In this spirit, we focus in this manuscript on the phenomenology of extended gauge group models and on the new heavy neutral and charged resonances, generically called Z' and W' predicted by these.In this manuscript we present different aspects of the phenomenology of the G(221) models. After reviewing these extensions, we present a public tool, PyR@TE, that aims at automating the calculation of RGEs at two-loop for arbitrary gauge theories and exemplify its use with the G(221) models. In a second part, we present our results for the calculation of the QCD corrections to the electroweak top-pair production as well as their implementation in a general purpose Monte Carlo generator allowing for a consistent matching of next-to-leading order (NLO) matrix elements with parton shower algorithms, the POWHEG BOX. We then review the status of our calculation of the QCD corrections to the electroweak single-top production. Finally, we present a different aspect of the phenomenology of new heavy resonances, Z', W' by studying their impact on the interaction of ultra-high energy neutrinos in the atmosphere. For definiteness we consider the Pierre Auger Observatory, which is sensible to showers initiated by neutrinos of extreme energies up to 10E12 GeV
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Submitted on : Monday, April 10, 2017 - 2:30:07 PM
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  • HAL Id : tel-01110759, version 2




Florian Lyonnet. New heavy resonances : from the electroweak to the planck scale. High Energy Physics - Phenomenology [hep-ph]. Université de Grenoble, 2014. English. ⟨NNT : 2014GRENY035⟩. ⟨tel-01110759v2⟩



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