0000000000267916
AUTHOR
Cristian Bosch
Improved tau-lepton tools for Higgs boson hunting
In this work, we use the results from Higgs searches in the $\gamma\gamma$ and $\tau\tau$ decay channels at LHC and indirect bounds as BR$(B \to X_s \gamma)$ to constrain the parameter space of a generic MSSM Higgs sector. In particular, we include the latest CMS results that look for additional Higgs states with masses up to 1 TeV. We show that the $\tau \tau$ channel is the best and most accurate weapon in the hunt for new Higgs states beyond the Standard Model. We obtain that present experimental results rule out additional neutral Higgs bosons in a generic MSSM below 300 GeV for any value of $\tan \beta$ and, for instance, values of $\tan \beta$ above 30 are only possible for Higgs mass…
Flavor-changing Higgs boson decays into bottom and strange quarks in supersymmetric models
In this work, we explore the flavor-changing decays ${H}_{i}\ensuremath{\rightarrow}bs$ in a general supersymmetric scenario. In these models the flavor-changing decays arise at loop level, but---because they originate from a dimension-four operator---they do not decouple and may provide a first sign of new physics for heavy masses beyond the reach of colliders. In the framework of the minimal supersymmetric extension of the Standard Model, we find that the largest branching ratio of the lightest Higgs (${H}_{1}$) is $\mathcal{O}(1{0}^{\ensuremath{-}6})$ after imposing present experimental constraints, while heavy Higgs states may still present branching ratios $\mathcal{O}(1{0}^{\ensuremat…
Prospects for constraining the shape of non-Gaussianity with the scale-dependent bias
We consider whether the non-Gaussian scale-dependent halo bias can be used not only to constrain the local form of non-Gaussianity but also to distinguish among different shapes. In particular, we ask whether it can constrain the behavior of the primordial three-point function in the squeezed limit where one of the momenta is much smaller than the other two. This is potentially interesting since the observation of a three-point function with a squeezed limit that does not go like the local nor equilateral templates would be a signal of non-trivial dynamics during inflation. To this end we use the quasi-single field inflation model of Chen and Wang as a representative two-parameter model, wh…
Composite states of two right-handed neutrinos
In this work, we develop a model for Higgs-like composites based on two generations of right-handed neutrinos that condense. We analyze the spontaneous symmetry breaking of the theory with two explicit breakings, setting the different scales of the model and obtaining massive bosons as a result. Finally, we calculate the gravitational wave imprint left by the phase transition associated with the symmetry breaking of a generic potential dictated by the symmetries of the composites.