11,776 research outputs found
Complementary strategy of New Physics searches in B-sector
We discuss a possible strategy for studies of a particular next-to-minimal
flavor violation New Physics (NP) scenario at LHC. Our analysis is based on
comparison of particular CKM matrix elements, which can be obtained from the
processes dominated by diagrams of different topology (tree, penguin and box).
We argue that the standard formalism of the overall unitarity triangle fit is
not suitable for searches of the chosen NP. We also stress the importance of
lattice computations of some relevant hadronic inputs.Comment: LaTeX, 23 pages, 4 eps figure
Impurity induced bound states and proximity effect in a bilayer exciton condensate
The effect of impurities which induce local interlayer tunneling in bilayer
exciton condensates is discussed. We show that a localized single fermion bound
state emerges inside the gap for any strength of impurity scattering and
calculate the dependence of the impurity state energy and wave function on the
potential strength. We show that such an impurity induced single fermion state
enhances the interlayer coherence around it, and is similar to the
superconducting proximity effect. As a direct consequence of these single
impurity states, we predict that a finite concentration of such impurities will
increase the critical temperature for exciton condensation.Comment: 4 pages, 2 figure
Relaxation of superflow in a network: an application to the dislocation model of supersolidity of helium crystals
We have considered the dislocation network model for the supersolid state in
He-4 crystals. In difference with uniform 2D and 3D systems, the temperature of
superfluid transition T_c in the network is much smaller than the degeneracy
temperature T_d. It is shown that a crossover into a quasi superfluid state
occurs in the temperature interval between T_c and T_d. Below the crossover
temperature the time of decay of the flow increases exponentially under
decrease of the temperature. The crossover has a continuous character and the
crossover temperature does not depend on the density of dislocations.Comment: Corrected typo
Charge ordering and interlayer phase coherence in quantum Hall superlattices
The possibility of the existence of states with a spontaneous interlayer
phase coherence in multilayer electron systems in a high perpendicular to the
layers magnetic field is investigated. It is shown that phase coherence can be
established in such systems only within individual pairs of adjacent layers,
while such coherence does not exist between layers of different pairs. The
conditions for stability of the state with interlayer phase coherence against
transition to a charge-ordered state are determined. It is shown that in the
system with the number of layers N\leq 10 these conditions are satisfied at any
value of the interlayer distance d. For N>10 there are two intervals of
stability: at sufficiently large and at sufficiently small d. For N\to \infty
the stability interval in the region of small d vanishesComment: 10 page
Grouping Method Of Image Fragments Of Adjacent Dislocation Etch Pits Of The Semiconductor Wafer
An increase in production volumes of gallium arsenide semiconductor devices determines the need for better control of dislocations of semiconductor wafer.The grouping method of image fragments of adjacent dislocation etch pits of the semiconductor wafer is proposed in the article. Adjacent fragments will be allocated in the pre-binarized image of wafer surface, which contains adjacent fragments of etch pits of dislocation loops after treatment by the described method. Improved methods for determining the loop line width determines the edge line width of etch pits of suspected dislocations, given the variability of their display in the binarized image. The current loop line width is compared to the reference line width of the dislocation loop.The grouping method of image fragments of adjacent dislocation etch pits of the semiconductor wafer defines recovery of loop lines branching, takes into account various options of line adjacency and determines the direction of further recovery of loop line of dislocation etch pits. A step by step description of the method is given
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