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      • Probing leptogenesis

        Chun, E. J.,Cvetič,, G.,Dev, P. S. B.,Drewes, M.,Fong, C. S.,Garbrecht, B.,Hambye, T.,Harz, J.,Herná,ndez, P.,Kim, C. S.,Molinaro, E.,Nardi, E.,Racker, J.,Rius, N.,Zamora-Saa, J. World Scientific Publishing Company 2018 International journal of modern physics. A, Partic Vol.33 No.6

        <P>The focus of this paper lies on the possible experimental tests of leptogenesis scenarios. We consider both leptogenesis generated from oscillations, as well as leptogenesis from out-of-equilibrium decays. As the Akhmedov-Rubakov-Smirnov (ARS) mechanism allows for heavy neutrinos in the GeV range, this opens up a plethora of possible experimental tests, e.g. at neutrino oscillation experiments, neutrinoless double beta decay, and direct searches for neutral heavy leptons at future facilities. In contrast, testing leptogenesis from out-of-equilibrium decays is a quite difficult task. We comment on the necessary conditions for having successful leptogenesis at the TeV-scale. We further discuss possible realizations and their model specific testability in extended seesaw models, models with extended gauge sectors, and supersymmetric leptogenesis. Not being able to test high-scale leptogenesis directly, we present a way to falsify such scenarios by focusing on their washout processes. This is discussed specifically for the left-right symmetric model and the observation of a heavy <TEX>$ W_{R}$</TEX>, as well as model independently when measuring <TEX>$ \Updelta L = 2$</TEX> washout processes at the LHC or neutrinoless double beta decay.</P>

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