Probing Resonant Leptogenesis at the LHC

Abstract

We explore direct collider probes of the resonant leptogenesis mechanism for the origin of matter. We work in the context of theories where the Standard Model is extended to include an additional gauged U(1) symmetry broken at the TeV scale, and where the light neutrinos obtain mass through a Type I seesaw at this scale. The CP asymmetry that generates the observed matter-antimatter asymmetry manifests itself in a difference between the number of positive and negative like-sign dileptons N(\ell^+\ell^+)-N(\ell^-\ell^-) that arise in the decay of the new Z' gauge boson to two right-handed neutrinos N, and their subsequent decay to leptons. The relatively low efficiency of resonant leptogenesis in this class of models implies that the CP asymmetry, ε, is required to be sizable, i.e. of order one. In particular, from the sign of the baryon asymmetry of the Universe, \emph{an excess of antileptons is predicted}. We identify the domains in M_{Z'}--M_N space where such a direct test is possible and find that with 300~fb^{-1} of data and no excess found, the LHC can set the $2\sigma$ exclusion limit ε\lesssim 0.22.

11 pages, 3 figures. Version substantially expanded, with two new appendices and a discussion of background added. Accepted for publication in PRD

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• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Low scale B-L extension of the Standard Model at the LHC
• Type-III see-saw at LHC
• Signatures for right-handed neutrinos at the Large Hadron Collider
• Measuring Z' couplings at the LHC
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