5,756 research outputs found
Associated heavy quarks pair production with Higgs as a tool for a search for non-perturbative effects of the electroweak interaction at the LHC
Assuming an existence of an anomalous triple electro-weak bosons interaction
being defined by coupling constant , we calculate its contribution to
interactions of the Higgs with pairs of heavy particles. Bearing in mind
experimental restrictions we present results for
possible effects in processes , . Effects could be
significant with negative sign of in associated heavy quarks
pairs production with the Higgs. In calculations we rely on results of the
non-perturbative approach to a spontaneous generation of effective
interactions, which defines the form-factor of the three-boson anomalous
interaction.Comment: 6 pages, 2 figures, few typos corrected, references adde
Local density of states at polygonal boundaries of d-wave superconductors
Besides the well-known existence of Andreev bound states, the zero-energy
local density of states at the boundary of a d-wave superconductor strongly
depends on the boundary geometry itself. In this work, we examine the influence
of both a simple wedge-shaped boundary geometry and a more complicated
polygonal or faceted boundary structure on the local density of states. For a
wedge-shaped boundary geometry, we find oscillations of the zero-energy density
of states in the corner of the wedge, depending on the opening angle of the
wedge. Furthermore, we study the influence of a single Abrikosov vortex
situated near a boundary, which is of either macroscopic or microscopic
roughness.Comment: 10 pages, 11 figures; submitted to Phys. Rev.
Chirality sensitive effect on surface states in chiral p-wave superconductors
We study the local density of states at the surface of a chiral p-wave
superconductor in the presence of a weak magnetic field. As a result, the
formation of low-energy Andreev bound states is either suppressed or enhanced
by an applied magnetic field, depending on its orientation with respect to the
chirality of the p-wave superconductor. Similarly, an Abrikosov vortex, which
is situated not too far from the surface, leads to a zero-energy peak of the
density of states, if its chirality is the same as that of the superconductor,
and to a gap structure for the opposite case. We explain the underlying
principle of this effect and propose a chirality sensitive test on
unconventional superconductors.Comment: 4 pages, 2 figure
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