12,695 research outputs found
CP violation versus flavour in supersymmetric theories
We show that the quark flavour structure and CP violating phenomena are
strongly correlated in supersymmetric theories. For a generic pattern of
supersymmetry breaking the two broad categories of Yukawa couplings, democratic
and hierarchical textures, have entirely different phenomenological
implications. With hierarchical Yukawas, the rephasing invariant phase,
arg(V_us V_cb V_cb^* V_cs^*), in the CKM mixing matrix has to be of order
unity, while the SUSY CP violating phases are severely constrained by electric
dipole moments, giving rise to the so-called SUSY CP problem. With democratic
Yukawas, all experimental CP results can be accommodated with small values for
the CKM and SUSY CP violating phases (i.e., CP can be considered as an
approximate symmetry at the high energy scale). We also show that within this
scenario, an entirely real CKM matrix in supersymmetric models is still allowed
by the present experimental results.Comment: 16 pages, 6 eps figure
Positronium lifetime in polymers
A model describing the relationship between the ortho--positronium lifetime
and the volume of a void, located in a synthetic zeolite, is analyzed. Our
idea, which allows us to take into account the effects of temperature,
comprises the introduction of a non--hermitian term in the Hamiltonian, which
accounts for the annihilation of the ortho--positronium. The predictions of the
present model are also confronted against an already known experimental result.Comment: Accepted in Journal of Chemical Physic
Analog voicing detector responds to pitch
Modified electronic voice encoder /Vocoder/ includes an independent analog mode of operation in addition to the conventional digital mode. The Vocoder is a bandwidth compression equipment that permits voice transmission over channels, having only a fraction of the bandwidth required for conventional telephone-quality speech transmission
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