We consider an extension of the Standard Model by heavy right-handed neutrinos and heavy Higgs doublets and show, using a renormalization group approach, that this model can simultaneously provide an explanation for the small neutrino masses and for the mild hierarchy observed between the atmospheric and the solar mass splittings, even when the extra degrees of freedom are very heavy. We analys...

Non-universal axion models, with the Peccei-Quinn (PQ) symmetry acting on Standard Model (SM) fermions in a generation-dependent way, are typically accompanied by two different sources of flavour violation, dubbed here as infrared (IR) and ultraviolet (UV). The former is due to violating couplings SM fermions, while latter arises from heavy degrees freedom that UV complete effective field theor...

This article describes the code SusHi (for “Supersymmetric Higgs”) [1] which calculates the cross sections pp/pp → φ + X in gluon fusion and bottom-quark annihilation in the SM, the 2HDM and the MSSM, where φ is any of the neutral Higgs bosons within these models. Apart from inclusive cross sections up to NNLO QCD, differential cross sections with respect to the Higgs transverse momentum pT and...

The upper and the lower bounds of the lightest CP-even Higgs-boson mass (mh) are discussed in the two-Higgs-doublet model (2HDM) with a softly-broken discrete symmetry. They are obtained as a function of a cut-off scale Λ (≤ 10 GeV) by imposing the conditions in which the running coupling constants neither blow up nor fall down below Λ. In comparison with the standard model (SM), although the u...

Although a relatively light Higgs boson coming from the SM can support the idea of the SM being true all the way to the Plank scale, most theorists consider such a possibility unlikely [1]. A light Higgs boson is preferred by precision fits of the Standard Model (SM) [2] and also theoretically required by many frameworks that can be effectively SM-like at low energies. The production of a Higgs...

We present the latest developments of the MadGraph/MadEvent Monte Carlo event generator and several applications to hadron collider physics. In the current version events at the parton, hadron and detector level can be generated directly from a web interface, for arbitrary processes in the Standard Model and in several physics scenarios beyond it (HEFT, MSSM, 2HDM). The most important additions...

We investigate the di-Higgs production at Large Hadron Collider in two-Higgs doublet model (2HDM). In particular, we study of an extra neutral Higgs boson $\phi$ association with Standard Model (SM) $h$ alignment limit. analyze two scenarios where additional is CP-even or -odd state a large top-Yukawa interaction. The leading contribution this comes from top-quark loop-induced gluon-fusion chan...

The stringent constraints from the direct searches for exotic scalars at LHC, as well indirect bounds flavor physics measurements, have imposed severe restrictions on parameter space of new models featuring extended Higgs sectors. In type-II two-Higgs-doublet model (2HDM), this implies a lower bound charged masses $\mathcal{O}(600\text{ }\text{ }\mathrm{GeV})$. work we analyze phenomenology ${Z...

A search for charged Higgs may yield clear and direct signs of new physics outside the realm Standard Model (SM). In Two-Higgs Doublet (2HDM), we investigate two main single production channels at Large Hadron Collider (LHC), assuming that either h or H replicates detected resonance ∼125GeV. We consider possibility boson through pp→H±W∓ pp→H±bj processes present additional significance LHC expe...