12,838 research outputs found
Probing new physics in decays by using angular asymmetries
We present the fully general, model independent study of a few rare
semileptonic decays that get dominant contributions from -annihilation
and -exchange diagrams, in particular ,
where . We consider the most general Lagrangian for the decay,
and define three angular asymmetries in the Gottfried-Jackson frame, which are
sensitive to new physics. We show how these angular asymmetries can be easily
extracted from the distribution of events in the Dalitz plot for decays. Especially a non-zero forward-backward asymmetry within
the frame would give the very first hint of possible new physics. These
observations are also true for related decay modes, such as and . Moreover, these asymmetry signatures
are not affected by either - or - mixings.
Then, this implies that both and as well as their CP conjugate modes can all be considered
together in our search for signature of new physics. Hence, it would be of
great importance to look for and study these decays in the laboratory, LHCb and
Belle II in particular.Comment: 5 pages, 2 figure
Thermo-mechanical analysis of carbon nanotube based functionally graded Timoshenko beam
This analytical work deals with prediction of the stresses developed in a Functionally Graded Timoshenko Beam that has been reinforced with Carbon Nanotubes (CNTs), which is subjected to thermal and mechanical loads. High temperatures have been applied to the upper and lower surfaces of the beam with a certain temperature difference between the two layers for the formation of a temperature gradient. The physical properties of the constituent elements of the beam material vary with temperature and further a variation in temperature leads to development of stresses in a beam. The constituent materials are alumina as the ceramic material, as well as the matrix material, of the functionally graded beam and single walled CNTs as the reinforcement material. Further the physical properties of the beam would vary along the thickness direction according to the volume fraction of the constituents of the beam. In this analysis the volumetric fraction varies according to power law. Temperature-dependent and temperature-independent material properties were obtained layer wise by dividing the entire thickness of the beam into ten layers. Thermal stresses were obtained using temperature-dependent and temperature-independent material properties for each layer for different slenderness ratios and compared
Wormholes in -gravity within the formalism
We propose, as a novelty in the literature, the modelling of wormholes within
the particular case of the gravity, namely , with and being the Ricci scalar and trace of the
energy-momentum tensor, respectively, while and are
constants. Although such a functional form application can be found in the
literature, those concern to compact astrophysical objects, such that no
wormhole analysis has been done so far. The quadratic geometric and linear
material corrections of this theory make the matter content of the wormhole to
remarkably be able to obey the energy conditions.Comment: Published versio
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