Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-10-20
Eur.Phys.J.C44:277-286,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
21 pages, 9 figures
Scientific paper
10.1140/epjc/s2005-02361-3
We study a particular texture of the neutrino mass matrix generated in supergravity with bilinear R-Parity violation. The relatively high value of $\tan\beta$ makes the one-loop contribution to the neutrino mass matrix as important as the tree-level one. The atmospheric angle is nearly maximal, and its deviation from maximal mixing is related to the smallness of the ratio between the solar and atmospheric mass scales. There is also a common origin for the small values of the solar and reactor angles, but the later is much smaller due the large mass ratio between the lightest two neutrinos. There is a high dependence of the neutrino mass differences on the scalar mass $m_0$ and the gaugino mass $M_{1/2}$, but a smaller one of the mixing angles on the same sugra parameters. Measurements of branching ratios for the neutralino decays can give important information on the parameters of the model. There are good prospects at a future Linear Collider for these measurements, but a more detailed analysis is necessary for the LHC.
Diaz Marco A.
Mora Clemencia
Zerwekh Alfonso R.
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