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Any of a family of elementary particles that participate in the weak interaction, including the electron and its associated neutrino.
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Few systems exist which allow for discrete symmetry tests in a purely leptonic sector.
(26) In conjunction with the leptonic theory of matter, it provides a mechanism for particle creation and the mass of these particles would be variable.
Their sensitivity to the two most unknown parameters of the leptonic sector, the CP violation phase and the atmospheric mixing angle, makes them ideal to probe correlations among the mixing angles.
A natural explanation in terms of nearby astrophysical accelerators of primary [e.sup.+] + [e.sup.-] pairs, e.g., pulsar wind nebulae (already invoked in [94] as potential contributors to the leptonic flux), was soon considered as a very promising one; see Figure 3 for a recent realization of this scenario, compared to up-to-date experimental data.
In order to estimate the error of the calculated parameters, variations of the Borel parameter, continuum thresholds, and leptonic decay constants, as the most significant reasons of the uncertainties, are considered.
This means that the leptonic partial widths of Y(4220) and Y(4390) can be as large as 200 and 1000 eV or even higher based on current information, because maybe there are some other decay channels for Y(4220) and Y(4390) that we have not observed.
Lopez-Pavon, "Unitarity of the leptonic mixing matrix," Journal of High Energy Physics, vol.
The square of amplitudes for the [[bar.B].sup.*] [right arrow] P[l.sup.-][[bar.[nu]].sub.l] decay can be written as the product of leptonic ([L.sub.[mu][nu]]) and hadronic ([H.sub.[mu][nu]]) tensors,
B factories gave a substantial contribution to particle physics such as first observation of CP violation apart from the kaon, measurements of CKM matrix elements, measurements of purely leptonic B meson decays, and searches for new physics.
van der Bij, "Natural model with an inverse seesaw mechanism and leptonic dark matter," Physical Review D: Particles, Fields, Gravitation and Cosmology, vol.
In this paper, we have presented one class of such type of pure leptonic and semileptonic decays of pseudoscalar mesons involving di-neutrinos in their final state in the framework of SM and R-parity violating ([[??].sub.p]) supersymmetric (SUSY) model.
Thus other physical properties such as decay constants, leptonic decay widths, radiative decay widths, etc.