Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-12-17
Nucl.Phys. B660 (2003) 322-342
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, LaTeX
Scientific paper
10.1016/S0550-3213(03)00258-X
In the minimal supersymmetric Standard Model with seesaw neutrino masses we show how R-parity can emerge naturally as a discrete gauge symmetry. The same discrete symmetry explains the smallness of the \mu-term (the Higgsino mass parameter) via the Giudice--Masiero mechanism. The discrete gauge anomalies are cancelled by a discrete version of the Green--Schwarz mechanism. The simplest symmetry group is found to be Z_4 with a charge assignment that is compatible with grand unification. Several other Z_N gauge symmetries are found for N=10,12,18,36 etc, with some models employing discrete anomaly cancellation at higher Kac-Moody levels. Allowing for a flavor structure in Z_N, we show that the same gauge symmetry can also explain the observed hierarchy in the fermion masses and mixings.
Babu K. S.
Gogoladze Ilia
Wang Kai
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