The Higgs sector of the minimal B−L model at future Linear Colliders

Abstract

We investigate the phenomenology of the Higgs sector of the minimal B − L extension of the Standard Model at a future e + e − Linear Collider. We consider the discovery potential of both a sub-TeV and a multi-TeV machine. We show that, within such a theoretical scenario, several novel production and decay channels involving the two physical Higgs states, precluded at the LHC, could experimentally be accessed at such machines. Amongst these, several Higgs signatures have very distinctive features with respect to those of other models with enlarged Higgs sector, as they involve interactions of Higgs bosons between themselves, with Z ′ bosons as well as with heavy neutrinos. In particular, we present the scope of the Z ′ strahlung process for single and double Higgs production, the only suitable mechanism enabling one to access an almost decoupled heavy scalar state (therefore outside the LHC range).

On the vacuum stability of SUSY models

“…Sometimes these fields are introduced explicitly to spontaneously break an extended gauge symmetry down to the SM gauge group e.g. [1,2], and they are assumed to have non-zero VEVs at the true vacuum of the theory. Other times they are introduced for other reasons, such as supersymmetry [3], and often non-zero VEVs for such fields would be disastrous, such as breaking SU(3) c and/or U(1) EM , which excludes certain parts of the parameter space of the minimal supersymmetric standard model (MSSM) from being phenomenologically relevant.…”

New Physics Opportunities in the Boosted Di-Higgs-Boson Plus Missing Transverse Energy Signature

“…FeynRules [29] is used for generating the UFO model files of the model [30]. The signal (and BGs) events are generated by MadGraph5 aMC@NLO, and passed to Pythia6 [31] for SM particles decay, parton showering and hadronization.…”

Non-exotic Z′ signals in ℓ + ℓ −, $ b\overline{b} $ and $ t\overline{t} $ final states at the LHC

“…The general class of models we are going to study is the one defined by the so-called nonexotic minimal Z models [21,22,23,24,25,26]. Following the convention of Ref.…”

“…Following the convention of Ref. [21], we summarise here just the relevant parts, i.e., the gauge and neutrino sectors, and we refer the reader to the latter publication for a complete description of the model.…”

“…In doing so we will borrow some (but not all) of the standard Z benchmarks from, e.g., [20] and [21], as well as define new ones.…”