{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/distinguishing-dirac-and-majorana-neutrinos","title":"Distinguishing Dirac and Majorana neutrinos by their gravi-majoron decays","arxiv_id":"1905.01264","date":"2019-05-03","proceeding":null,"authors":["Lena Funcke","Georg Raffelt","Edoardo Vitagliano"],"abstract":"Neutrinos may acquire small Dirac or Majorana masses by new low-energy physics in terms of the chiral gravitational anomaly, as proposed by Dvali and Funcke (2016). This model predicts fast neutrino decays, $\\nu_i\\to\\nu_j+\\phi$ and $\\nu_i\\to\\bar{\\nu}_j+\\phi$, where the gravi-majorons $\\phi$ are pseudoscalar Nambu-Goldstone bosons. The final-state neutrino and antineutrino distributions differ depending on the Dirac or Majorana mass of the initial state. This opens a channel for distinguishing these cases, for example in the spectrum of high-energy astrophysical neutrinos. In particular, we put bounds on the neutrino lifetimes in the Majorana case, ${\\tau_2}/{m_2}> 1.1\\times 10^{-3}(6.7\\times 10^{-4})~{\\rm s/eV}$ and ${\\tau_3}/{m_3}> 2.2\\times 10^{-5}(1.3\\times 10^{-4})~{\\rm s/eV}$ at 90% CL for hierarchical (degenerate) masses, using data from experiments searching for antineutrino appearance from the Sun.","url_abs":"https://arxiv.org/abs/1905.01264v2","url_pdf":"https://arxiv.org/pdf/1905.01264v2.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"distinguishing-dirac-and-majorana-neutrinos","repo_url":"https://github.com/ElonSteveWang/hep_make_bib_v2","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"syntology_url":null,"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}