965 research outputs found
Neutrino Mass Matrix Textures: A Data-driven Approach
We analyze the neutrino mass matrix entries and their correlations in a
probabilistic fashion, constructing probability distribution functions using
the latest results from neutrino oscillation fits. Two cases are considered:
the standard three neutrino scenario as well as the inclusion of a new sterile
neutrino that potentially explains the reactor and gallium anomalies. We
discuss the current limits and future perspectives on the mass matrix elements
that can be useful for model building.Comment: 25 pages, 18 figure
On the MSSM with hierarchical squark masses and a heavier Higgs boson
In the contest of supersymmetric extensions of the Standard Model, we
consider a spectrum in which the lightest Higgs boson has mass between 200 and
300 GeV and the first two generations of squarks have masses above 20 TeV,
considering the Higgs boson mass and the Supersymmetric Flavour Problem as
related naturalness problems. After the analysis of some models in which the
previous spectrum can be naturally realised, we consider the phenomenological
consequences for the LHC and for Dark Matter.Comment: 8 pages, 5 figures, proceedings of the LC10 worksho
Can New Colored Particles Illuminate the Higgs?
We analyze the behavior of Higgs to diphoton rate and Higgs gluon-gluon
production cross section in minimal extensions of the Standard Model comprising
new colored vector-like fermions that do not mix with the ordinary ones. We
compare these information with constraints coming from electroweak precision
measurements. We compute pair production cross sections for the lightest
fermion and discuss the LHC bounds. Finally, we study the phenomenology of
possible quarkonium states composed by these new colored fermions.Comment: 18 pages, 7 figures. v2: typos fixed, references added, small
improvements mad
Collider phenomenology of Hidden Valley mediators of spin 0 or 1/2 with semivisible jets
Many models of Beyond the Standard Model physics contain particles that are
charged under both Standard Model and Hidden Valley gauge groups, yet very
little effort has been put into establishing their experimental signatures. We
provide a general overview of the collider phenomenology of spin 0 or 1/2
mediators with non-trivial gauge numbers under both the Standard Model and a
single new confining group. Due to the possibility of many unconventional
signatures, the focus is on direct production with semivisible jets. For the
mediators to be able to decay, a global symmetry must be broken. This is
best done by introducing a set of operators explicitly violating this symmetry.
We find that there is only a finite number of such renormalizable operators and
that the phenomenology can be classified into five distinct categories. We show
that large regions of the parameter space are already excluded, while others
are unconstrained by current search strategies. We also discuss how searches
could be modified to better probe these unconstrained regions by exploiting
special properties of semivisible jets.Comment: 40 pages, 11 figures, published versio
Can the new resonance at LHC be a CP-Odd Higgs boson?
A plausible explanation of the recent experimental indication of a resonance
in the two-photon spectrum at LHC is that it corresponds to the CP-odd Higgs
boson. We explore such a possibility in a generic framework of the two Higgs
doublet models (2HDM), and combine GeV with the known ~GeV to show that the charged Higgs boson and the other CP-even
scalar masses become bounded from bellow and from above. We show that this
possibility is also consistent with the electroweak precision data and the low
energy observables, which we test in a few leptonic and semileptonic decay
modes.Comment: 16 pages, published versio
A Neutrinophilic 2HDM as a UV Completion for the Inverse Seesaw Mechanism
In Neutrinophilic Two Higgs Doublet Models, Dirac neutrino masses are
obtained by forbidding a Majorana mass term for the right-handed neutrinos via
a symmetry. We study a variation of such models in which that symmetry is taken
to be a local U(1), leading naturally to the typical Lagrangian of the inverse
seesaw scenario. The presence of a new gauge boson and of an extended scalar
sector result in a rich phenomenology, including modifications to Z, Higgs and
kaon decays as well as to electroweak precision parameters, and a pseudoscalar
associated to the breaking of lepton number.Comment: 21 pages, 2 figures, matches the published version in JHE
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