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

Publicated to:Journal Of High Energy Physics. 2018 (2): - 2018-02-01 2018(2), DOI: 10.1007/JHEP02(2018)169

Authors: Abada A; De Romeri V; Lucente M; Teixeira AM; Toma T

Affiliations

Fakultät für Physik, Technische Universität München - Author
IN2P3 Institut National de Physique Nucleaire et de Physique des Particules - Author
Laboratoire de Physique Theorique d'Orsay - Author
Université Catholique de Louvain - Author
University of Valencia - Author
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Abstract

© 2018, The Author(s). 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|, 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+ → ℓα+ℓβ+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 mναβ.

Keywords

Beyond standard modelNeutrino physics

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Journal Of High Energy Physics due to its progression and the good impact it has achieved in recent years, according to the agency WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2018, it was in position 5/29, thus managing to position itself as a Q1 (Primer Cuartil), in the category Physics, Particles & Fields.

From a relative perspective, and based on the normalized impact indicator calculated from World Citations provided by WoS (ESI, Clarivate), it yields a value for the citation normalization relative to the expected citation rate of: 2.42. This indicates that, compared to works in the same discipline and in the same year of publication, it ranks as a work cited above average. (source consulted: ESI Nov 14, 2024)

This information is reinforced by other indicators of the same type, which, although dynamic over time and dependent on the set of average global citations at the time of their calculation, consistently position the work at some point among the top 50% most cited in its field:

  • Weighted Average of Normalized Impact by the Scopus agency: 3.38 (source consulted: FECYT Feb 2024)
  • Field Citation Ratio (FCR) from Dimensions: 21.02 (source consulted: Dimensions Jun 2025)

Specifically, and according to different indexing agencies, this work has accumulated citations as of 2025-06-17, the following number of citations:

  • WoS: 45
  • Scopus: 52
  • OpenCitations: 44

Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-06-17:

  • The use, from an academic perspective evidenced by the Altmetric agency indicator referring to aggregations made by the personal bibliographic manager Mendeley, gives us a total of: 5.
  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 5 (PlumX).

With a more dissemination-oriented intent and targeting more general audiences, we can observe other more global scores such as:

  • The Total Score from Altmetric: 0.25.
  • The number of mentions on the social network X (formerly Twitter): 1 (Altmetric).

Leadership analysis of institutional authors

This work has been carried out with international collaboration, specifically with researchers from: Belgium.