Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-04-25
Phys.Rev.D78:013006,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
29 pages, 27 figures; added explanatory comments, corrected typos, final version for publication
Scientific paper
10.1103/PhysRevD.78.013006
The most general supersymmetric seesaw mechanism has too many parameters to be predictive and thus can not be excluded by any measurements of lepton flavour violating (LFV) processes. We focus on the simplest version of the type-I seesaw mechanism assuming minimal supergravity boundary conditions. We compute branching ratios for the LFV scalar tau decays, ${\tilde \tau}_2 \to (e,\mu) + \chi^0_1$, as well as loop-induced LFV decays at low energy, such as $l_i \to l_j + \gamma$ and $l_i \to 3 l_j$, exploring their sensitivity to the unknown seesaw parameters. We find some simple, extreme scenarios for the unknown right-handed parameters, where ratios of LFV branching ratios correlate with neutrino oscillation parameters. If the overall mass scale of the left neutrinos and the value of the reactor angle were known, the study of LFV allows, in principle, to extract information about the so far unknown right-handed neutrino parameters.
del Moral Albert Villanova
Hirsch Manfred
Porod Werner
Romão Jorge C.
Valle Jose W. F.
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