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We consider the simple extension of the Standard Model in which an additionalright handed neutrino propagates along a flat extra dimension, while theStandard Model fields are confined on a 3-brane. The fifth dimension is$S^1/Z_2$ orbifold compactified. In this scenario, the neutrino mass can benaturally suppressed. By studying systematically the fundamental parameterspace, we show that the strong phenomenological constraints on mixing anglesbetween active and sterile neutrinos (especially those derived from the SNOexperiment data) do not conflict with the possibility of generating a realisticneutrino mass spectrum. As a second step, we explore the possibility of asuccessful leptogenesis through the decays of the Kaluza-Klein excitations ofthe right handed neutrino.Comment: 16 pages, 2 ps figure

Neutrinos in flat extra dimension: towards a realistic scenario