1,721,079 research outputs found
Supersymmetry without a light Higgs boson
Full text linkIn this thesis I shall discuss a class of supersymmetric models characterized by a
Higgs sector with a strongish self-coupling and a relatively heavy spectrum, with the
mass of the lightest CP-even Higgs boson around 200-300 GeV. The effective field theory
for these models is SUSY [1] that is to say the Next-To-Minimal Supersymmetric
Standard Model with large coupling SH1H2 in the superpotential.
I shall discuss in detail a model with scale-invariant superpotential, with particular
focus on the dynamical origin of the term and its relation with the mass of the Higgs
boson.
I shall discuss the fine tuning of the model and various experimental constraints
from LEP direct searches, precision data and direct DM searches. I shall argue that the
model naturally accommodates the current limits and I shall discuss the main features
of the signatures at the LHC.
The material of this thesis comes mostly from two papers [2, 3]. Furthermore,
during my PhD years in Pisa I have worked on other problems in collider phenomenology
[4] and astro-particle physics [5]. As they do not have direct connection with supersymmetry
and the Higgs boson they are not discussed in this thesis
Status of LHC Searches for SUSY without R-Parity
Full text linkIn this contribution we briefly review the status of current searches for supersymmetry at the Large Hadron Collider, focusing especially on viable sub-TeV colored superpartners which can appear in nonstandard scenarios. The presented material covers mostly signals that do not crucially rely on the presence of large missing transverse momentum, with special emphasis on R-parity violating supersymmetry. For some scenarios the prospects for the next run of the Large Hadron Collider and future machines are also presented
Energy peaks: A high energy physics outlook
No full textEnergy distributions of decay products carry information on the kinematics of the decay in ways that are at the same time straightforward and quite hidden. I will review these properties and discuss their early historical applications, as well as more recent ones in the context of (i) methods for the measurement of masses of new physics particle with semi-invisible decays, (ii) the characterization of Dark Matter particles produced at colliders, (iii) precision mass measurements of Standard Model particles, in particular of the top quark. Finally, I will give an outlook of further developments and applications of energy peak method for high energy physics at colliders and beyond
Neutrino Masses with Inverse Hierarchy from Broken : a Reappraisal
No full textWe discuss a class of models of neutrino masses and mixings with inverse hierarchy based on a broken U(1)_F flavour symmetry with charge L_e-L_\mu-L_\tau. The symmetry breaking sector receives separate contributions from flavon vev breaking terms and from soft mass breaking in the right handed Majorana sector. The model is able to reproduce in a natural way all observed features of the charged lepton mass spectrum and of neutrino masses and mixings (even with arbitrarily small \theta_{13}), with the exception of a moderate fine tuning which is needed to accomodate the observed small value of r = Delta m^2_{sol} / Delta m^2_{atm}.We discuss a class of models of neutrino masses and mixings with inverse hierarchy based on a broken U(1)_F flavour symmetry with charge L_e-L_\mu-L_\tau for lepton doublets and arbitrary right-handed charges. The symmetry breaking sector receives separate contributions from flavon vev breaking terms and from soft mass breaking in the right handed Majorana sector. The model is able to reproduce in a natural way all observed features of the charged lepton mass spectrum and of neutrino masses and mixings (even with arbitrarily small \theta_{13}), with the exception of a moderate fine tuning which is needed to accomodate the observed small value of r = Delta m^2_{sol} / Delta m^2_{atm}
Minimal matter at the LHC
No full textA systematic approach for a model independent description of phenomenology at the LHC is presented. The most general linear interaction of scalars and fermions with pairs of standard model fields is considered at the renormalizable level. Searches for the new states are devised and the reach of TeVatron and LHC is discussed. Extensions to more general cases with more complicated spectra and interactions mediated by higher dimensional operators are briefly discussed.IT
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