3,426 research outputs found
On quark-lepton complementarity
Recent measurements of the neutrino solar mixing angle and the Cabibbo angle
satisfy the empirical relation theta_{sol} + theta_{C} ~ 45^{o}. This relation
suggests the existence of a correlation between the mixing matrices of leptons
and quarks, the so called quark-lepton complementarity. Here, we examine the
possibility that this correlation originates in the strong hierarchy in the
mass spectra of quarks and charged leptons, and the seesaw mechanism that gives
mass to the Majorana neutrinos. In a unified treatment of quarks and leptons in
which the mass matrices of all fermions have a similar Fritzsch texture, we
calculate the mixing matrices V_{CKM} and U_{MNSP} as functions of quark and
lepton masses and only two free parameters, in very good agreement with the
latest experimental values on masses and mixings. Three essential ingredients
to explain the quark-lepton complementarity relation are identified: the strong
hierarchy in the mass spectra of quarks and charged leptons, the normal seesaw
mechanism and the assumption of maximal CP violation in the lepton sector.Comment: 6 pages, to appear in "Particles and fields: Xth Mexican Workshop on
Particles and Fields" (Morelia, Mich. Mexico, November 6-12, 2005), Eds. A.
Bashir and L. Villasenor, AIP Conference proceedings (2006
Universal Mass Texture, CP violation and Quark-Lepton Complementarity
The measurements of the neutrino and quark mixing angles satisfy the
empirical relations called Quark-Lepton Complementarity. These empirical
relations suggest the existence of a correlation between the mixing matrices of
leptons and quarks. In this work, we examine the possibility that this
correlation between the mixing angles of quarks and leptons originates in the
similar hierarchy of quarks and charged lepton masses and the seesaw mechanism
type~I, that gives mass to the Majorana neutrinos. We assume that the similar
mass hierarchies of charged lepton and quark masses allows us to represent all
the mass matrices of Dirac fermions in terms of a universal form with four
texture zeroes.Comment: 14 page
Muon g-2 through a flavor structure on soft SUSY terms
In this work we analyze the possibility to explain the muon anomalous
magnetic moment discrepancy within theory and experiment through lepton flavor
violation processes. We propose a flavor extended MSSM by considering a
hierarchical family structure for the trilinear scalar Soft-Supersymmetric
terms of the Lagranagian, present at the SUSY breaking scale. We obtain
analytical results for the rotation mass matrix, with the consequence of having
non-universal slepton masses and the possibility of leptonic flavour mixing.
The one-loop supersymmetric contributions to the leptonic flavour violating
process are calculated in the physical basis, with slepton
flavour mixed states, instead of using the well known Mass Insertion Method. We
present the regions in parameter space where the muon g-2 problem is either
entirely solved or partially reduced through the contribution of these flavor
violating processes.Comment: 21 pages, 7 figures. Changes on version 3: In order to obtain the
complete result for muon g-2 in the limit of non-flavor violation we added
the terms given in the appendix. We redid the graphics and numerical analysis
including these changes. We also corrected some typos and changed the order
of figure
Extraction of topological features from communication network topological patterns using self-organizing feature maps
8 Pages, 5 figures, To be appeared in IEE Electronics Letter Journal8 Pages, 5 figures, To be appeared in IEE Electronics Letter Journal8 Pages, 5 figures, To be appeared in IEE Electronics Letter JournalDifferent classes of communication network topologies and their representation in the form of adjacency matrix and its eigenvalues are presented. A self-organizing feature map neural network is used to map different classes of communication network topological patterns. The neural network simulation results are reported
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Bioinspired snapping-claw apparatus to study hydrodynamic cavitation effects on the corrosion of metallic samples
A creative low-cost and compact mechanical device that mimics the rapid closure of the pistol shrimp claw was used to conduct electrochemical experiments, in order to study the effects of hydrodynamic cavitation on the corrosion of aluminum and steel samples. Current-time curves show significant changes associated with local variations in dissolved O2 concentration, cavitation-induced erosion and changes in the nature of the surface corrosion products
Unfolding of eigenvalue surfaces near a diabolic point due to a complex perturbation
The paper presents a new theory of unfolding of eigenvalue surfaces of real
symmetric and Hermitian matrices due to an arbitrary complex perturbation near
a diabolic point. General asymptotic formulae describing deformations of a
conical surface for different kinds of perturbing matrices are derived. As a
physical application, singularities of the surfaces of refractive indices in
crystal optics are studied.Comment: 23 pages, 7 figure
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