Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-05-31
Phys.Rev.D76:117301,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages. Final version, to appear on PRD
Scientific paper
10.1103/PhysRevD.76.117301
We present a simple texture that predicts the cotangent of the solar neutrino mixing angle to be equal to the golden ratio. This prediction is 1.4 standard deviations below the present best-fit value and final SNO and KamLAND data could discriminate it from tri-bi-maximal mixing. The neutrino mass matrix is invariant under a Z_2 x Z'_2 symmetry: that geometrically is a reflection along the diagonal of the golden rectangle. Assuming an analogous structure in the quark sector suggests a golden prediction for the Cabibbo angle, theta_C = pi/4- theta_12 = 13.3 degree, up to uncertainties comparable to V_{ub}.
Kajiyama Yuji
Raidal Martti
Strumia Alessandro
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