Upper Bounds on Lepton-number Violating Processes

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dc.creatorAtre, Anupama
dc.creatorBarger, Vernon
dc.creatorHan, Tao
dc.date2005-02-17
dc.date2005-07-07
dc.date.accessioned2026-07-07T11:31:45Z
dc.date.available2026-07-07T11:31:45Z
dc.descriptionWe consider four lepton-number violating (\lv) processes: (a) neutrinoless double-beta decay (0νββ), (b) Delta L = 2 tau decays, (c) Delta L = 2 rare meson decays and (d) nuclear muon-positron conversion. In the absence of exotic \lv interactions, the rates for these processes are determined by effective neutrino masses <m>_{\ell_1\ell_2}, which can be related to the sum of light neutrino masses, the neutrino mass-squared differences, the neutrino mixing angles, a Dirac phase and two Majorana phases. We sample the experimentally allowed ranges of <m>_{\ell_1\ell_2} based on neutrino oscillation experiments as well as cosmological observations, and obtain a stringent upper bound <m>_{\ell_1\ell_2} \lsim 0.14 eV. We then calculate the allowed ranges for <m>_{\ell_1\ell_2} from the experimental rates of direct searches for the above Delta L = 2 processes. Comparing our calculated rates with the currently or soon available data, we find that only the $0νββ$ experiment may be able to probe <m>_{ee} with a sensitivity comparable to the current bound. Muon-positron conversion is next in sensitivity, while the limits of direct searches for the other Delta L = 2 processes are several orders of magnitude weaker than the current bounds on <m>_{\ell_1\ell_2}. Any positive signal in those direct searches would indicate new contributions to the \lv interactions beyond those from three light Majorana neutrinos.
dc.description20 pages, revtex4, 2 figures (5 files), Version published in Physical Review D
dc.identifierhttps://arxiv.org/abs/hep-ph/0502163
dc.identifierhttp://arxiv.org/abs/hep-ph/0502163
dc.identifierPhys.Rev.D71:113014,2005
dc.identifierdoi:10.1103/PhysRevD.71.113014
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/197372
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.titleUpper Bounds on Lepton-number Violating Processes
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