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We investigate the sources of neutrino mass generation in Little Higgstheories, by confining ourselves to the "Littlest Higgs" scenario. Ourconclusion is that the most satisfactory way of incorporating neutrino massesis to include a lepton-number violating interaction between the scalar tripletand lepton doublets. The tree-level neutrino masses generated by the vacuumexpectation value of the triplet are found to dominate over contributions fromdimension-five operators so long as no additional large lepton-number violatingphysics exists at the cut-off scale of the effective theory. We also calculatethe various decay branching ratios of the charged and neutral scalar tripletstates, in regions of the parameter space consistent with the observed neutrinomasses, hoping to search for signals of lepton-number violating interactions incollider experiments.Comment: 27 pages, 4 figures. v2: minor clarifications in discussion, version  to appear in PR

Neutrino masses and lepton-number violation in the littlest Higgs scenario