Electroweak-scale resonant leptogenesis

By A. Pilaftsis, T. Underwood. 2005

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We study minimal scenarios of resonant leptogenesis near the electroweak phase transition. These models offer a number of testable phenomenological signatures for low-energy experiments and future high-energy colliders. Our study extends previous analyses of the relevant network of Boltzmann equations, consistently taking into account effects from out of equilibrium sphalerons and single lepton flavors. We show that the effects from single lepton flavors become very important in variants of resonant leptogenesis, where the observed baryon asymmetry in the Universe is created by lepton-to-baryon conversion of an individual lepton number, for example, that of the {tau}-lepton. The predictions of such resonant {tau}-leptogenesis models for the final baryon asymmetry are almost independent of the initial lepton-number and heavy neutrino abundances. These models accommodate the current neutrino data and have a number of testable phenomenological implications. They contain electroweak-scale heavy Majorana neutrinos with appreciable couplings to electrons and muons, which can be probed at future e{sup +}e{sup -} and {mu}{sup +}{mu}{sup -} high-energy colliders. In particular, resonant {tau}-leptogenesis models predict sizable 0{nu}{beta}{beta} decay, as well as e- and {mu}-number-violating processes, such as {mu}{yields}e{gamma} and {mu}{yields}e conversion in nuclei, with rates that are within reach of the experiments proposed by the MEG and MECOmore » collaborations.« less

Subfields: Molecular Biology, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/255a97b8e48f3800f39c0b0729e91c3bff74159d

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Citations in the corpus

A facility to search for hidden particles at the CERN SPS: the SHiP physics case (2015, background): “An indispensable feature of RL models is that flavour effects due to the light-to-heavy neutrino Yukawa couplings [687–689] play a dramatic role and can modify the predictions for the BAU by many orders of magnitude [687, 688].”
Leptogenesis (2008, neutral): “Then, the self-energy contribution involving the intermediate N2, to the total CP asymmetry (we neglect important flavour effects [61]) is given by ǫN1(self − energy) = − M1 M2 Γ2 M2 M(2) 2 ∆M 2 21 (∆M2 21) 2 +M2 1 Γ 2 2 Im[(λλ)(2)12] (λ†λ)11(λ†λ)22 .”
Lepton number and flavour violation in TeV-scale left-right symmetric theories with large left-right mixing (2013, neutral): “The μ→ e conversion rate is given by [74, 82, 83, 98] R μ→e = α(3) emα 4 Wm 5 μ 16π(2)m4WLΓcapt Z(4) eff Z ∣”
Leptogenesis in the Universe (2012, background): “Such a scenario has been termed ‘resonant leptogenesis’, and has benefited from many studies in different formalisms17 [50, 155, 52, 110, 156, 157, 158, 159, 75, 111, 160, 161, 162, 163, 85, 86, 164, 87, 165, 166, 167, 168] (see Ref.”
Baryogenesis from the weak scale to the grand unification scale (2020, background): “In this case leptogenesis temperatures of the order of TeV are possible, which implies the possibility of testing thermal leptogenesis at high-energy colliders (Pilaftsis and Underwood, 2005).”
A White Paper on keV sterile neutrino Dark Matter (2016, background): “[393]) or large lepton flavor violating rates [394].”
Flavor structures of charged fermions and massive neutrinos (2019, neutral): “[240, 241, 242, 243]).”