58,354 research outputs found
Outpatient Civil Commitment in North Carolina: Constitutional and Policy Concerns
Outpatient commitment of the mentally ill is court-ordered treatment in the community and is usually characterized by short, recurring visits to a mental health clinic that provides treatment such as medication, individual or group therapy, day or part-day activities or supervision of living arrangements. The history and design of the North Carolina preventive commitment scheme and constitutional difficulties with this statute are discussed
A to Z of Flavour with Pati-Salam
We propose an elegant theory of flavour based on family
symmetry with Pati-Salam unification which provides an excellent description of
quark and lepton masses, mixing and CP violation. The symmetry unifies
the left-handed families and its vacuum alignment determines the columns of
Yukawa matrices. The symmetry distinguishes the right-handed families and
its breaking controls CP violation in both the quark and lepton sectors. The
Pati-Salam symmetry relates the quark and lepton Yukawa matrices, with
and . Using the see-saw mechanism with very
hierarchical right-handed neutrinos and CSD4 vacuum alignment, the model
predicts the entire PMNS mixing matrix and gives a Cabibbo angle
. In particular it predicts maximal atmospheric mixing,
and leptonic CP violating phase
. The reactor angle prediction is
, while the solar angle is , for a lightest neutrino mass in the range meV, corresponding to a normal neutrino mass hierarchy and a very
small rate for neutrinoless double beta decay.Comment: 38 pages, 28 figures, published versio
Atmospheric and Solar Neutrinos with a Heavy Singlet
We follow a minimalistic approach to neutrino masses, by introducing a single
heavy singlet into the standard model (or supersymmetric standard model)
with a heavy Majorana mass , which couples as a single right-handed neutrino
in a Dirac fashion to leptons, and induces a single light see-saw mass
, leaving two neutrinos massless. This trivial
extension to the standard model may account for the atomospheric neutrino data
via oscillations with near maximal mixing angle
and . In order to account for the solar neutrino data the model is extended to
SUSY GUT/ string-inspired type models which can naturally yield an additional
light tau neutrino mass leading to
oscillations with and a mixing angle in the correct range for the small angle MSW
solution to the solar neutrino problem. The model predicts oscillations with a
similar angle but a larger splitting .Comment: 10 pages, Latex. Expanded discussion of mixing angles mainly in an
Appendi
and the origin of Yukawa couplings
We explore the possibility that the semi-leptonic decay ratios
which violate universality are related to the origin of
the fermion Yukawa couplings in the Standard Model. Some time ago, a
vector-like fourth family (without a ) was used to generate fermion mass
hierarchies and mixing patterns without introducing any family symmetry.
Recently the idea of inducing flavourful couplings via mixing with a
vector-like fourth family which carries gauged charges has been
proposed as a simple way of producing controlled flavour universality violation
while elegantly cancelling anomalies. We show that the fusion of these two
ideas provides a nice connection between and the origin of Yukawa
couplings in the quark sector. However the lepton sector requires some tuning
of Yukawa couplings to obtain the desired coupling of to muons.Comment: Minor corrections to phenomenology section to match published
version. 19 pages, 4 figure
Flavour from the Planck scale to the electroweak scale
We discuss a theory of flavour in which Higgs Yukawa couplings are related to
those of the new scalar triplet leptoquark and/or responsible for
, with all couplings arising effectively from mixing with a
vector-like fourth family, whose mass may be anywhere from the Planck scale to
the electroweak scale for the leptoquarks explanation, but is pinned down to
the TeV scale if the exchange plays a role. However, in this particular
model, only leptoquark exchange can contribute significantly to ,
since exchange is too constrained from mixing and , although other Higgs Yukawa matrix structures may allow it.Comment: 6 pages, 11 figures. Contribution to the 2019 EW session of the 54th
Rencontres de Morion
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