arXiv subjects

L. P. Freitas

Publications and source records attributed to L. P. Freitas.

4 recordsLinked to original sources

arXiv1999

Testing Flavor Changing Neutrino Interactions in Long Baseline Experiments

We have investigated the possibility of discerning mass from flavor changing neutrino interactions induced $ν_μ\to ν_τ$ oscillations in the long baseline neutrino experiments K2K and MINOS. We have found that for virtually any value of the flavor conserving parameter $ε^\prime$ it will be possible to, independently, distinguish these two mechanisms at K2K, if the flavor changing parameter $ε$ is in the range $ε\gsim 0.77$, and at MINOS, if $ε\gsim 0.2$. Moreover, if K2K measures a depletion of the expected $ν_μ$ flux then MINOS will either observe or discard completely flavor changing neutrino oscillations.

hep-ph↗

arXiv1999

Limits on Majorana Neutrinos from Recent Experimental Data

We investigate the sensitivity of some weak processes to the simplest extension of the Standard Model with Majorana neutrinos mixing in the leptonic sector. Values for mixing angles and masses compatible with several experimental accelerator data and the most recent neutrinoless double--$β$ decay limit were found.

hep-ph↗

arXiv1997

Closed Expressions for Lie Algebra Invariants and Finite Transformations

A simple procedure to obtain complete, closed expressions for Lie algebra invariants is presented. The invariants are ultimately polynomials in the group parameters. The construction of finite group elements require the use of projectors, whose coefficients are invariant polynomials. The detailed general forms of these projectors are given. Closed expressions for finite Lorentz transformations, both homogeneous and inhomogeneous, as well as for Galilei transformations, are found as examples.

math-ph↗

arXiv1997

Continuous Iteration of Dynamical Maps

A precise meaning is given to the notion of continuous iteration of a mapping. Usual discrete iterations are extended into a dynamical flow which is a homotopy of them all. The continuous iterate reveals that a dynamical map is formend by independent component modes envolving without interference with each other.

math-ph↗