Tests of low-scale leptogenesis in charged lepton flavour violation experiments

We consider low-energy tests of low-scale leptogenesis based on the type I seesaw scenario with three right-handed singlet neutrinos nu(lR). In this scenario, successful leptogenesis is possible for quasi-degenerate in mass heavy Majorana neutrinos N-1,N-2,N-3, M-1,M-2,M-3 congruent to M, |M-j - M-i| << M, i not equal j = 1, 2, 3, heavy Majorana neutrino masses M similar to (0.05 - 5 x 10(5)) GeV, and Nj charged current and neutral current weak interaction couplings as large as O(10(-2)). We derive the constraints on the corresponding leptogenesis parameter space from the existing data from low-energy experiments, including the limits from the experiments on mu -> e gamma decay and on the rate of mu - e conversion in gold. We show also that the planned and upcoming experiments on charged lepton flavour violation with mu(+/-), MEG II on the mu -> e gamma decay, Mu3e on mu -> eee decay, Mu2e and COMET on mu - e conversion in aluminium and PRISM/PRIME on mu - e conversion in titanium, can probe significant region of the viable leptogenesis parameter space, and thus have a potential for a discovery. Experiments on tau -> eee(mu mu mu) and tau -> e(mu)gamma decays (e.g., BELLE II) also can probe a part of the leptogenesis parameter space, although a relatively small one.(c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).