Effective Majorana mass matrix from tau and pseudoscalar meson lepton number violating decays

Abada, Asmâa; Romeri, Valentina De; Lucente, Michele; Teixeira, Ana; Toma, Takashi

doi:10.1007/jhep02(2018)169

Cited by 65 publications

(59 citation statements)

References 225 publications

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“…For instance, at colliders, there are several possible signatures of lepton number violation [14][15][16][17][18][19][20]. As pointed out in several analyses, neutrino Majorana phases can also give rise to non-vanishing contributions to charged lepton electric dipole moments (EDMs) [21]; in particular, the computation of EDMs in the presence of right-handed neutrinos (like in the Type-I seesaw model) has been addressed in refs.…”

Section: Jhep04(2018)030mentioning

confidence: 99%

Electric dipole moments in the minimal scotogenic model

Abada

Toma

2018

J. High Energ. Phys.

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In this work we consider a minimal version of the scotogenic model capable of accounting for an electron electric dipole moment within experimental sensitivity reach in addition to providing a dark matter candidate and radiatively generating neutrino masses. The Standard Model is minimally extended by two sterile fermions and one inert scalar doublet, both having odd parity, while the Standard Model particles have an even parity, imposed by a Z 2 symmetry. The neutrino Yukawa couplings provide additional sources of CP violation, and thus a possible impact on electric dipole moments of charged leptons. This model provides two possible dark matter candidates (one bosonic and one fermionic) and our results show that, independently of the ordering of the generated light neutrino spectrum, one can have sizeable electron electric dipole moment within ACME sensitivity reach in the case of fermionic dark matter candidate.

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Section: Jhep04(2018)030mentioning

confidence: 99%

Electric dipole moments in the minimal scotogenic model

Abada

Toma

2018

J. High Energ. Phys.

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“…where σ W and σ B are the W and B production cross sections in a given process. They then decay semileptonically or purely leptonically, cf., e.g., [68,108,[110][111][112][113].…”

Section: An Example: Heavy Neutrinosmentioning

confidence: 99%

New long-lived particle searches in heavy-ion collisions at the LHC

et al. 2020

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We show that heavy ion collisions at the LHC provide a promising environment to search for signatures with displaced vertices in well-motivated New Physics scenarios. Compared to proton collisions, they offer several advantages, i) the number of parton level interactions per collision is larger, ii) there is no pile-up, iii) the lower instantaneous luminosity compared to proton collisions allows to operate the LHC experiments with very loose triggers, and iv) there are new production mechanisms that are absent in proton collisions. In the present work we focus on the third point and show that the modification of the triggers alone can increase the number of observable events by orders of magnitude if the long lived particles are predominantly produced with low transverse momentum. Our results show that collisions of ions lighter than lead are well-motivated from the viewpoint of searches for New Physics. We illustrate this for the example of heavy neutrinos in the Neutrino Minimal Standard Model.

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“…• In parallel with collider searches it is possible to look for LNV decays of tau leptons and pseudoscalar mesons as discussed in Refs. [39,82,102,103]. One issue is that if the LNV process is mediated by the light neutrinos the amplitude is proportional to and suppressed by the small m 2 ν , while if mediated by heavy neutrinos it is suppressed by 1/m N and |V N | 2 .…”

Section: Meson Decays and Beam-dump Experimentsmentioning

confidence: 99%

Neutrinoless double beta decay versus other probes of heavy sterile neutrinos

Bolton

Deppisch

Dev³

2020

J. High Energ. Phys.

171

138

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We make a comparative study of the neutrinoless double beta decay constraints on heavy sterile neutrinos versus other direct and indirect constraints from both lepton number conserving and violating processes, as a sensitive probe of the extent of lepton number violation and possible interference effects in the sterile sector. To this effect, we introduce a phenomenological parametrisation of the simplified one-generation seesaw model with one active and two sterile neutrino states in terms of experimentally measurable quantities, such as active-sterile neutrino mixing angles, CP phases, masses and mass splittings. This simple parametrisation enables us to analytically derive a spectrum of possible scenarios between the canonical seesaw with purely Majorana heavy neutrinos and inverse seesaw with pseudo-Dirac ones. We then go on to constrain the simplified parameters of this model from various experiments in energy, intensity and cosmic frontiers. We emphasise that the constraints from lepton number violating processes strongly depend on the mass splitting between the two sterile states and the relative CP phase between them. This is particularly relevant for the neutrinoless double beta decay constraint, which could now get significantly weaker for small mass splitting and opposite CP parities between the sterile states. It is important to keep this in mind while comparing the neutrinoless double beta decay constraint with the direct search limits in the electron flavour from high-energy colliders.

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Effective Majorana mass matrix from tau and pseudoscalar meson lepton number violating decays

Cited by 65 publications

References 225 publications

Electric dipole moments in the minimal scotogenic model

Electric dipole moments in the minimal scotogenic model

New long-lived particle searches in heavy-ion collisions at the LHC

Neutrinoless double beta decay versus other probes of heavy sterile neutrinos

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