Falsifying high-scale baryogenesis with neutrinoless double beta decay and lepton flavor violation

Deppisch, Frank F.; Harz, Julia; Huang, Wei-Chih; Hirsch, Martin; Päs, Heinrich

doi:10.1103/physrevd.92.036005

Cited by 69 publications

(106 citation statements)

References 41 publications

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“…We note that the discovery of a non-standard 0νββ-decay mechanism such as a right-handed current would rule out most models of baryogenesis at scales above 40 TeV [12].…”

Section: Arxiv:150607145v2 [Hep-ph] 6 Jul 2015mentioning

confidence: 99%

Reexamining the light neutrino exchange mechanism of the0νββdecay with left- and right-handed leptonic and hadronic currents

et al. 2015

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The light neutrino exchange mechanism of the 0νββ-decay with left-and right-handed leptonic and hadronic currents revisited. The extension of Majorana neutrino mass mechanism of the neutrinoless double-beta decay (0νββ) with the inclusion of right-handed leptonic and hadronic currents is revisited. While only the exchange of light neutrinos is assumed, the s 1/2 and p 1/2 -states of emitted electrons as well as recoil corrections to the nucleon currents are taken into account. Within the standard approximations the decay rate is factorized into a sum of products of kinematical phase-space factors, nuclear matrix elements and the fundamental parameters that characterize the lepton number violation. Unlike in the previous treatments the induced pseudoscalar term of hadron current is included, resulting in additional nuclear matrix elements. An improved numerical computation of the phase-space factors is presented, based on the exact Dirac wave functions of the s 1/2 and p 1/2 electrons with finite nuclear size and electron screening taken into account. The dependence of values of these phase-space factors on the different approximation schemes used in evaluation of electron wave functions is discussed. The upper limits for effective neutrino mass and the parameters λ and η characterizing the right-handed current mechanism are deduced from data on the 0νββ-decay of 76 Ge and 136 Xe using nuclear matrix elements calculated within the nuclear shell model and quasiparticle random phase approximation. The differential decay rates, i.e. the angular correlations and the single electron energy distributions for various combinations of the total lepton number violating parameters that can help to disentangle the possible mechanism are described and discussed.

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“…We note that the discovery of a non-standard 0νββ-decay mechanism such as a right-handed current would rule out most models of baryogenesis at scales above 40 TeV [12].…”

Section: Arxiv:150607145v2 [Hep-ph] 6 Jul 2015mentioning

confidence: 99%

Reexamining the light neutrino exchange mechanism of the0νββdecay with left- and right-handed leptonic and hadronic currents

et al. 2015

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“…Observation of LNV at the LHC would therefore strongly constrain baryogenesis scenarios above the scale M X . A similar argument can be applied to non-standard mechanisms mediating 0νβ β decay and low energy LFV processes [4]: if observed, the corresponding processes would be in equilibrium in certain temperature ranges. The low energy 0νβ β decay can in general be triggered by effect LNV operators of dimension 5 (the Weinberg operator leading to the standard light neutrino exchange), dimension 7 (generically leading to long-range contributions again mediated by light neutrinos) and higher odd-dimensional operators (generically leading to short range operators).…”

mentioning

confidence: 95%

Falsifying Baryogenesis Mechanisms through Observation of Lepton Number and Flavor Violation

Deppisch¹

2017

Proceedings of 38th International Conference on High Energy Physics — PoS(ICHEP2016)

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The presence of (B − L) violating interactions is a necessary ingredient in many models trying to explain the observed baryon asymmetry of the universe, but if they are found to be strong they herald the occurrence of a temperature range where any pre-existing (B − L) asymmetry is washed out. We demonstrate in a model-independent approach that the observation of lepton number violating processes can rule out or strongly disfavor certain mechanisms of baryogenesis, including leptogenesis scenarios. We will especially focus on non-standard mechanisms of neutrinoless double beta decay as well as potential lepton number violating processes at the LHC. If such processes are observed associated to a certain energy scale Λ LNV , baryogenesis mechanisms acting at higher scales will be generally disfavored. We will further describe how the argument can be strengthened by using information from lepton flavor violating processes such as µ → eγ. If additionally observed, it would indicate the presence of interactions that equilibrate different lepton flavors, closing the loophole of asymmetries being stored in different lepton flavors. We will outline in detail how baryogenesis mechanisms are affected by certain observations.

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“…An important aspect of leptogenesis is the dilution and wash-out effect induced by different particles and their interactions in the theory. In particular, the strong (exponential) dependence of the lepton asymmetry on the wash-out effect can be used to falsify high-scale leptogenesis at the LHC [31], as well as in low-energy experiments [32]. As for probing TeV scale leptogenesis, it depends on the details of the model under consideration [33].…”

Section: Jhep03(2018)122mentioning

confidence: 99%

Leptogenesis constraints on B − L breaking Higgs boson in TeV scale seesaw models

Dev¹,

Mohapatra

2018

J. High Energ. Phys.

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In the type-I seesaw mechanism for neutrino masses, there exists a B − L symmetry, whose breaking leads to the lepton number violating mass of the heavy Majorana neutrinos. This would imply the existence of a new neutral scalar associated with the B −L symmetry breaking, analogous to the Higgs boson of the Standard Model. If in such models, the heavy neutrino decays are also responsible for the observed baryon asymmetry of the universe via the leptogenesis mechanism, the new seesaw scalar interactions with the heavy neutrinos will induce additional dilution terms for the heavy neutrino and lepton number densities. We make a detailed study of this dilution effect on the lepton asymmetry in three generic classes of seesaw models with TeV-scale B − L symmetry breaking, namely, in an effective theory framework and in scenarios with global or local U(1) B−L symmetry. We find that requiring successful leptogenesis imposes stringent constraints on the mass and couplings of the new scalar in all three cases, especially when it is lighter than the heavy neutrinos. We also discuss the implications of these new constraints and prospects of testing leptogenesis in presence of seesaw scalars at colliders.

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Falsifying high-scale baryogenesis with neutrinoless double beta decay and lepton flavor violation

Cited by 69 publications

References 41 publications

Reexamining the light neutrino exchange mechanism of the0νββdecay with left- and right-handed leptonic and hadronic currents

Reexamining the light neutrino exchange mechanism of the0νββdecay with left- and right-handed leptonic and hadronic currents

Falsifying Baryogenesis Mechanisms through Observation of Lepton Number and Flavor Violation

Leptogenesis constraints on B − L breaking Higgs boson in TeV scale seesaw models

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