Effective Majorana mass matrix from tau and pseudoscalar meson lepton number violating decays
Abstract An observation of any lepton number violating process will undoubtedly point towards the existence of new physics and indirectly to the clear Majorana nature of the exchanged fermion. In this work, we explore the potential of a minimal extension of the Standard Model via heavy sterile fermi...
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doaj-e5806f80b4e74f9194386c80ac897a712020-11-24T21:54:24ZengSpringerOpenJournal of High Energy Physics1029-84792018-02-012018215710.1007/JHEP02(2018)169Effective Majorana mass matrix from tau and pseudoscalar meson lepton number violating decaysAsmaa Abada0Valentina De Romeri1Michele Lucente2Ana M. Teixeira3Takashi Toma4Laboratoire de Physique Théorique, CNRS, Univ. Paris-Sud, Université Paris-SaclayAHEP Group, Instituto de Física Corpuscular, C.S.I.C./Universitat de ValènciaCentre for Cosmology, Particle Physics and Phenomenology — CP3, Université Catholique de LouvainLaboratoire de Physique de Clermont, CNRS/IN2P3 — UMR 6533Physik-Department T30d, Technische Universität MünchenAbstract An observation of any lepton number violating process will undoubtedly point towards the existence of new physics and indirectly to the clear Majorana nature of the exchanged fermion. In this work, we explore the potential of a minimal extension of the Standard Model via heavy sterile fermions with masses in the [0.1 − 10] GeV range concerning an extensive array of “neutrinoless” meson and tau decay processes. We assume that the Majorana neutrinos are produced on-shell, and focus on three-body decays. We conduct an update on the bounds on the active-sterile mixing elements, Uℓα4Uℓβ4 $$ \left|{U}_{\ell }{{}_{{}_{\alpha}}}_4{U}_{\ell }{{}_{{}_{\beta}}}_4\right| $$, taking into account the most recent experimental bounds (and constraints) and new theoretical inputs, as well as the effects of a finite detector, imposing that the heavy neutrino decay within the detector. This allows to establish up-to-date comprehensive constraints on the sterile fermion parameter space. Our results suggest that the branching fractions of several decays are close to current sensitivities (likely within reach of future facilities), some being already in conflict with current data (as is the case of K + → ℓ α + ℓ β + π −, and τ − → μ +π−π−). We use these processes to extract constraints on all entries of an enlarged definition of a 3 × 3 “effective” Majorana neutrino mass matrix m ν αβ .http://link.springer.com/article/10.1007/JHEP02(2018)169Beyond Standard ModelNeutrino Physics |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Asmaa Abada Valentina De Romeri Michele Lucente Ana M. Teixeira Takashi Toma |
spellingShingle |
Asmaa Abada Valentina De Romeri Michele Lucente Ana M. Teixeira Takashi Toma Effective Majorana mass matrix from tau and pseudoscalar meson lepton number violating decays Journal of High Energy Physics Beyond Standard Model Neutrino Physics |
author_facet |
Asmaa Abada Valentina De Romeri Michele Lucente Ana M. Teixeira Takashi Toma |
author_sort |
Asmaa Abada |
title |
Effective Majorana mass matrix from tau and pseudoscalar meson lepton number violating decays |
title_short |
Effective Majorana mass matrix from tau and pseudoscalar meson lepton number violating decays |
title_full |
Effective Majorana mass matrix from tau and pseudoscalar meson lepton number violating decays |
title_fullStr |
Effective Majorana mass matrix from tau and pseudoscalar meson lepton number violating decays |
title_full_unstemmed |
Effective Majorana mass matrix from tau and pseudoscalar meson lepton number violating decays |
title_sort |
effective majorana mass matrix from tau and pseudoscalar meson lepton number violating decays |
publisher |
SpringerOpen |
series |
Journal of High Energy Physics |
issn |
1029-8479 |
publishDate |
2018-02-01 |
description |
Abstract An observation of any lepton number violating process will undoubtedly point towards the existence of new physics and indirectly to the clear Majorana nature of the exchanged fermion. In this work, we explore the potential of a minimal extension of the Standard Model via heavy sterile fermions with masses in the [0.1 − 10] GeV range concerning an extensive array of “neutrinoless” meson and tau decay processes. We assume that the Majorana neutrinos are produced on-shell, and focus on three-body decays. We conduct an update on the bounds on the active-sterile mixing elements, Uℓα4Uℓβ4 $$ \left|{U}_{\ell }{{}_{{}_{\alpha}}}_4{U}_{\ell }{{}_{{}_{\beta}}}_4\right| $$, taking into account the most recent experimental bounds (and constraints) and new theoretical inputs, as well as the effects of a finite detector, imposing that the heavy neutrino decay within the detector. This allows to establish up-to-date comprehensive constraints on the sterile fermion parameter space. Our results suggest that the branching fractions of several decays are close to current sensitivities (likely within reach of future facilities), some being already in conflict with current data (as is the case of K + → ℓ α + ℓ β + π −, and τ − → μ +π−π−). We use these processes to extract constraints on all entries of an enlarged definition of a 3 × 3 “effective” Majorana neutrino mass matrix m ν αβ . |
topic |
Beyond Standard Model Neutrino Physics |
url |
http://link.springer.com/article/10.1007/JHEP02(2018)169 |
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