Abstract
Abstract We present a fit to the 2012 LHC Higgs data in different supersymmetric frameworks using naturalness as a guiding principle. We consider the MSSM and its D-term and F -term extensions that can raise the tree-level Higgs mass. When adding an extra chiral superfield to the MSSM, three parameters are needed determine the tree-level couplings of the lightest Higgs. Two more parameters cover the most relevant loop corrections, that affect the hγγ and hgg vertexes. Motivated by this consideration, we present the results of a five parameters fit encompassing a vast class of complete supersymmetric theories. We find meaningful bounds on singlet mixing and on the mass of the pseudoscalar Higgs m A as a function of tan β in the MSSM. We show that in the (m A , tan β) plane, Higgs couplings measurements are probing areas of parameter space currently inaccessible to direct searches. We also consider separately the two cases in which only loop effects or only tree-level effects are sizable. In the former case we study in detail stops’ and charginos’ contributions to Higgs couplings, while in the latter we show that the data point to the decoupling limit of the Higgs sector. In a particular realization of the decoupling limit, with an approximate PQ symmetry, we obtain constraints on the heavy scalar Higgs mass in a general type-II Two Higgs Doublet Model.
Highlights
We study the new tree-level effects, distinguishing between the cases in which an approximately type-II 2HDM structure is preserved and those in which the mixing with extra light states in the Higgs sector is sizeable
We present fit results in several simplified settings, considering the cases in which: (1) only the tree-level mixing with the second Higgs doublet plays a role, (2) only tree-level effects are important, but both the second Higgs doublet and an extra singlet are responsible for deviations in the couplings and (3) only MSSM loop effects from stops and charginos are sizeable
Deviations in the Higgs couplings are probed by the measurements of the Higgs rates, which are determined by partial widths
Summary
Deviations in the Higgs couplings are probed by the measurements of the Higgs rates, which are determined by partial widths. First and foremost, the type-II 2HDM structure of the MSSM Higgs potential is not strongly affected by non-holomorphic loop corrections in a natural theory, regardless of our definition of tuning. We have seen that naturalness prefers stops and charginos to be fairly light, and for this reason we consider their loop contributions to the Higgs to digluon/diphoton partial widths, introducing two new parameters. They can be chosen as δrGt , characterizing the stop contribution to the dimension-5 Higgs-gluon-gluon coupling and δrγχ±, characterizing the chargino contribution to the dimension-5 Higgs-photon-photon-coupling.
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