38 research outputs found
Probing the Z? sector of the minimal B?L model at future linear colliders in the e+e? ? ?+?? process
No full textWe study the capabilities of future electron-positron Linear Colliders, with centre-of-mass energy at the TeV scale, in accessing the parameter space of a Z' boson within the minimal B?L model. In such a model, wherein the Standard Model gauge group is augmented by a broken U(1)B?L symmetry – with B(L) being the baryon(lepton) number — the emerging Z' mass is expected to be in the above energy range. We carry out a detailed comparison between the discovery regions mapped over a two-dimensional configuration space (Z' mass and coupling) at the Large Hadron Collider and possible future Linear Colliders for the case of di-muon production. As known in the literature for other Z' models, we confirm that leptonic machines, as compared to the CERN hadronic accelerator, display an additional potential in discovering a B?L Z' boson as well as in allowing one to study its properties at a level of precision well beyond that of any of the existing colliders
Prospects for 2HDM charged Higgs searches
No full textWe discuss the prospects for charged Higgs boson searches at the LHC, within the two-Higgs-doublet models (2HDM). The 2HDM is generally less constrained than the corresponding sector of the MSSM, but there are still severe theoretical and experimental constraints that already exclude significant regions of the naive parameter space. Explicit searches in the and channels are further restricting parts of the 2HDM parameter space
Higgs phenomenology in the minimal B-L extension of the Standard Model at LHC
No full textWe present some phenomenology of the Higgs sector of the Minimal B ? L U(l) Extension of the Standard Model at the Large Hadron Collider. In this model, the existence of an extra gauge boson (Z') and an extra scalar (heavy Higgs) are predicted as naturally related with the breaking of the B ? L (baryon minus lepton number) symmetry. For this, we have started by deriving the unitarity bounds in the high energy limit for the Minimal B ? L Model parameter space. This was accomplished by analysing the full class of Higgs and would-be Goldstone boson two-to-two scatterings at tree level (exploiting the Equivalence Theorem). Hence, we studied some peculiar signature that could be observed at the CERN machine in the search of both light and heavy Higgs bosons
LHC physics of extra gauge bosons in the 4D Composite Higgs Model
No full textWe study the phenomenology of both the Neutral Current (NC) and Charged Current (CC) Drell-Yan (DY) processes at the Large Hadron Collider (LHC) within a 4 Dimensional realization of a Composite Higgs model with partial compositness by estimating the integrated and differential event rates and taking into account the possible impact of the extra fermions present in the spectrum. We show that, in certain regions of the parameters space, the multiple neutral resonances present in the model can be distinguishable and experimentally accessible in the invariant or transverse mass distributions. <br/
Il lavoro nelle miniere di carbone tra Ottocento e Novecento: un profilo tra sociologia e letteratura
No full textThe author outlines the role that coal has played from the expansive phase of industrial development to the present days. Coal is still the most abundant and widespread fossil fuel, whose consumption is driven by the impetuous growth of China and India and the recent increase in production in the United States. Thus, the mining proletariat still exists: there are operative coal mines on all continents and coal miners are more than those who worked in the English coal mines at the time of the industrial revolution; in some countries their working conditions are not very different from those of two centuries ago, whereas Trade Unions are weaker or non-existent. This gives an unexpected topicality to the study of the work of miners between the eighteenth and nineteenth centuries, which the author also performs through the contribution of literature, starting from the characteristics of an unnatural and hostile work environment, which the industrial hunger of fossil and metal-mining resources has prevented (and still prevents) from considering a denial of human condition
Production of Z' and W' via Drell-Yan processes in the 4D Composite Higgs Model at the LHC
No full textWe present an analysis of both the Neutral Current (NC) and Charged Current (CC) Drell-Yan processes at the LHC within a 4 Dimensional realization of a Composite Higgs model studying the cross sections and taking into account the possible impact of the extra fermions present in the spectrum
Composite Higgs searches at the LHC and beyond
No full textGeneral Composite Higgs models provide an elegant solution to the hierarchy problem present in the Standard Model and give an alternative pattern leading to the mechanism of electroweak (EW) symmetry breaking. We present an analysis of a realistic realization of this general idea, namely the 4DCHM, analysing the Higgs production and decay modes, fitting them to the latest LHC showing the compatibility with the results of the CERN machine. We then present the prospects of a future electron positron collider of testing this model against the expected experimental accuracies in the various Higgs decay channels accessible herein
The CP-violating type-II 2HDM and Charged Higgs boson benchmarks
No full textWe review and update the interpretation of the 125 GeV scalar as the lightest Higgs boson of the Two-Higgs-Doublet Model, allowing for CP violation in the potential. The detection of a charged Higgs boson would exclude the Standard Model. Proposed benchmarks for charged- Higgs searches in the channel pp → H+W-X → W+W-H1X are reviewed and updated.<br/
