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Winter Institute 2018 - Hunting for Physics Beyond the Standard Model: current status and prospects at future colliders
Aula Seminari (LNF)
Despite the great achievement of the discovery of the Higgs boson, the Large Hadron Collider has found no evidence of physics Beyond the Standard Model and the exclusion limits on new physics have now become pretty strong. The LNF Winter Institute 2018 will discuss the prospects to discover new physics at the present LHC run, in its high-luminosity and high-energy phases, as well as at other future colliders.
In particular, we shall debate the searches for Z' bosons, predicted by U(1) gauge groups inspired by Grand Unification Theories, taking particular care about supersymmetric and leptophobic scenarios and Dark Matter signature in models based on extended Higgs sectors, possibly CP-violating.
We will also investigate the perpectives at future circular colliders from the viewpoint of Higgs and top-quark phenomenology.
In this talk will be presented an updated overview on the searches for BSM
heavy neutral resonances (usually called Z'-bosons) at LHC in the Run-II
stage. Theoretically-inspired BSM models featuring a Z' boson will be introduced
and their phenomenology will be explored in relation with the usual CMS and
ATLAS groups experimental analysis. Some critical aspects of the latter will be discussed,
motivating the introduction of extra observables and techniques to improve the sensitivity
for both the detection and the diagnose of Z' signals, with particular focus
on less conventional scenarios featuring large resonance widths and multiple
E6-Inspired U(1)’-Extended MSSM: From Dark Matter to LHC1h
The MSSM has undoubtedly been a successful framework in terms of
suggesting solutions to the unresolved shortcomings of the Standard Model
such as Dark Matter, the Gauge hierarchy problem etc. However, the lack of
evidence for Supersymmetry at the LHC motivates us to investigate extensions
of the MSSM basic gauge group structure, with the hope of finding answers to
these questions. For this reason, we have studied a simple U(1)’ extension
of the MSSM group structure which can arise within the Grand Unified
framework. We investigate scenarios in which either the right-handed
sneutrino or the lightest neutralino are viable dark matter candidates and
we explore the parameter space of different supersymmetric realisations
featuring an extra U(1)'. On the side of LHC phenomenology, searching for
heavy Z' vector bosons predicted in such models is a challenging objective.
The ATLAS and CMS collaborations have looked for such Z’ bosons assuming
that they can only decay into Standard Model channels, and have placed
corresponding exclusion limits by considering dilepton, dijet and, to a
smaller extent, top-antitop final states. Alongside with dark matter, we
also explore possible loopholes in these Z’ searches by studying
supersymmetric as well as leptophobic scenarios and we proposed a possible
way to probe leptophobic Z’ via supersymmetric final states.
Dark Matter and collider signatures of extended Higgs sectors with or without CP violation1h
I will review popular minimal singlet and doublet scalar extensions of
the Standard Model with viable Dark Matter candidates. After satisfying
relic density conditions, these models are further constrained by direct
and indirect detection experiments and by LHC data.
Moreover, if one introduces CP violation in the scalar sector, the bounds
from Electric Dipole Moment experiments limit the model further.
I will then motivate 3-Higgs-Doublet Models and show that such models can
accommodate Dark Matter candidates and CP violation in the scalar sector
simultaneously while surviving all experimental and theoretical bounds. I
will then present "smoking gun" signatures of such models at the LHC.
On the way to future circular colliders: new physics opportunities with top quarks and Higgs bosons1h
While LHC Run 2 operations are ongoing, it is timely to start considering
the next phase of the high-energy collider program including both the LHC
and future projects under discussion. In this context, I will follow a
bottom-up path where the Standard Model Lagrangian is modified by several
effective operators and investigate how studying the production of a pair of
top-antitop quarks and three Higgs bosons could provide meaningful probes
for deviations of from the Standard Model.