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A radiatively-induced neutrino mass matrix with a simple structure isproposed on the basis of an SU(5) SUSY GUT model with R-parity violation. Themodel has matter fields $\bar{5}'_{L}+5'_{L}$ in addition to the ordinarymatter fields $\bar{5}_{L}+10_{L}$ and Higgs fields $H_u+\bar{H}_d$. TheR-parity violating terms are given by $\bar{5}_{L} \bar{5}_{L} 10_{L}$, whilethe Yukawa interactions are given by $\bar{H}_d \bar{5}'_{L} 10_{L}$. Since thematter fields $\bar{5}'_L$ and $\bar{5}_L$ are different from each other at theunification scale, the R-parity violation effects at a low energy scale appearonly through the $\bar{5}'_L \leftrightarrow \bar{5}_{L}$ mixings. In order tomake this R-parity violation effect harmless for proton decay, a discretesymmetry Z_3 and a triplet-doublet splitting mechanism analogous to the Higgssector are assumed.Comment: 4 pages, 1 figure, talk at ICHEP2004, to appear in Proceeding

NEUTRINO MASSES WITHOUT SEESAW MECHANISM IN A SUSY SU(5) MODEL WITH ADDITIONAL $\bar{5}\prime_{L} + 5\prime_L$