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We argue that the superpartner of the Dirac right-handed neutrino is a primecandidate for dark matter created from a 'mattergenesis' mechanism. We showthat due to the smallness of the Yukawa couplings, a right-handed sneutrinodensity created in the early Universe would not be erased by annihilations,which remain out of thermal equilibrium. It would also not be drowned by alater, additional production of right-handed sneutrinos, as the relic densityof the non-thermal right-handed sneutrinos is found to be generally negligiblecompared to the observed dark matter density. Mild constraints on sneutrinomasses and trilinear SUSY-breaking couplings are obtained. Possiblemattergenesis scenarios are also mentionedComment: 11 pages, 2 figures, 2 typos added, 1 reference added, minor  corrections in section

Non-thermal right-handed sneutrino dark matter and the ΩDM/Ωbproblem

Non-thermal right-handed sneutrino dark matter and the Ω_DM/Ω_bproblem