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arXiv · 1609.03594

Leptogenesis and neutral gauge bosons

Julian Heeck·Daniele Teresi
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Abstract

We consider low-scale leptogenesis via right-handed neutrinos $N$ coupled to a $Z'$ boson, with gauged $U(1)_{B-L}$ as a simple realization. Keeping the neutrinos sufficiently out of equilibrium puts strong bounds on the $Z'$ coupling strength and mass, our focus being on light $Z'$ and $N$, testable in the near future by SHiP, HPS, Belle II, and at the LHC. We show that leptogenesis could be robustly falsified in a large region of parameter space by the double observation of $Z'$ and $N$, e.g. in the channel $pp\to Z' \to NN$ with displaced $N$-decay vertex, and by several experiments searching for light $Z'$, according to the mass of $N$.

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Julian Heeck, Daniele Teresi. 2016-09-12. Leptogenesis and neutral gauge bosons. https://doi.org/10.1103/physrevd.94.095024

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