Abstract
We present the first version of a new tool to scan the parameter space of generic scalar potentials, ScannerS (Coimbra et al., ScannerS project., 2013). The main goal of ScannerS is to help distinguish between different patterns of symmetry breaking for each scalar potential. In this work we use it to investigate the possibility of excluding regions of the phase diagram of several versions of a complex singlet extension of the Standard Model, with future LHC results. We find that if another scalar is found, one can exclude a phase with a dark matter candidate in definite regions of the parameter space, while predicting whether a third scalar to be found must be lighter or heavier. The first version of the code is publicly available and contains various generic core routines for tree level vacuum stability analysis, as well as implementations of collider bounds, dark matter constraints, electroweak precision constraints and tree level unitarity.
Highlights
In the Standard Model (SM), electroweak symmetry breaking (EWSB) is achieved by one complex SU(2)L scalar doublet
We have presented a new tool, SCANNERS, devoted to the search for global minima in multi-Higgs models
In this work we have applied it to some versions of a simple extension of the SM—the addition of a complex singlet to the SM doublet, with some symmetries
Summary
In the SM, electroweak symmetry breaking (EWSB) is achieved by one complex SU(2)L scalar doublet. Adding a scalar singlet to the potential could provide a viable dark matter candidate [4,5,6,7,8,9,10,11,12,13,14] as well as means of achieving electroweak baryogenesis by allowing a strong first-order phase transition during the era of EWSB [15,16,17,18,19] Minimal, this extension provides a rich collider phenomenology leading to some distinctive signatures that can be tested at the LHC [20,21,22,23,24,25,26,27]. We have included in the code the most relevant theoretical and experimental constraints both from dark matter and collider
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