Neutrino magnetic moment induced by leptoquarks - art. no. 073002

Allowing leptoquarks to interact with both right-handed and left-handed neu trinos (i.e., "nonchiral" leptoquarks), we show that a nonzero neutrino mag netic moment can arise naturally. Although the mass of the nonchiral Vector leptoquark that couples to the first generation fermions is constrained se verely by universality of the pi(+) leptonic decays and is found to be grea ter than 50 TeV, the masses of the second and third generation nonchiral ve ctor leptoquarks may evade such constraint and may in general be in the ran ge of 1-100 TeV. With reasonable input mass and coupling values, we find th at the neutrino magnetic moment due to the second generation leptoquarks is of the order of 10(-12)-10(-15) mu(B), while that caused by the third gene ration leptoquarks, being enhanced significantly by the large top quark mas s, is in the range of 10(-10)-10(-13) mu(B). [S0556-2821(99)06509-1].