12,494 research outputs found
Zero-curvature condition in two dimensions. Relativistic particle models and finite \W-transformations
A relation between an gauge particle model and the zero-curvature
condition in a two-dimensional gauge theory is presented. For the case
we construct finite \W-transformations.Comment: 14 pages, UTTG-04-9
Particle Mechanics Models with W-symmetries
We introduce a particle mechanics model with Sp() gauge invariance.
Different partial gauge-fixings by means of sl(2) embeddings on the gauge
algebra lead to reduced models which are invariant under diffeomorphisms and
classical non-linear \W-transformations as the residual gauge symmetries thus
providing a set of models of gauge and matter fields coupled in a \W-invariant
way. The equations of motion for the matter variables give Lax operators in a
matrix form. We examine several examples in detail and discuss the issue of
integration of infinitesimal \W-transformations.Comment: 34 pages, LaTeX, no figures. Several changes (including Title) and
new material added. Version to appear in Ann. Phy
Exploring sizable triple Higgs couplings in the 2HDM
An important task at future colliders is the measurement of the triple Higgs
coupling. Depending on its size relative to the Standard Model (SM) value,
certain collider options result in a higher experimental accuracy. Within the
framework of Two Higgs Doublet Models (2HDM) type I and II we investigate the
allowed ranges for all triple Higgs couplings involving at least one light,
SM-like Higgs boson. We take into account theoretical constraints (unitarity,
stability), experimental constraints from direct Higgs-boson searches,
measurements of the SM-like Higgs-boson properties, flavor observables and
electroweak precision data. We find that the SM-type triple Higgs coupling
w.r.t. its SM value, , can range between and . Depending on which value is realized, the HL-LHC can
compete with, or is clearly inferior to the ILC. We find the coupling
between and . Triple Higgs couplings
involving two heavy Higgs bosons, , and
can reach values up to , roughly independent
of the 2HDM type. This can lead to potentially strongly enhanced production of
two Higgs-bosons at the HL-LHC or high-energy colliders.Comment: 44 pages, 16 figure
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