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Nicholson, A; Berkowitz, E; Monge-Camacho, H; Brantley, D; Garron, N; Chang, C C; Rinaldi, E; Clark, M A; Joó, B; Kurth, T; Tiburzi, B C; Vranas, P; Walker-Loud, A
Physical review letters, 2018-Oct-26, Letnik: 121, Številka: 17Journal Article
Observation of neutrinoless double beta decay, a lepton number violating process that has been proposed to clarify the nature of neutrino masses, has spawned an enormous world-wide experimental effort. Relating nuclear decay rates to high-energy, beyond the standard model (BSM) physics requires detailed knowledge of nonperturbative QCD effects. Using lattice QCD, we compute the necessary matrix elements of short-range operators, which arise due to heavy BSM mediators, that contribute to this decay via the leading order π^{-}→π^{+} exchange diagrams. Utilizing our result and taking advantage of effective field theory methods will allow for model-independent calculations of the relevant two-nucleon decay, which may then be used as input for nuclear many-body calculations of the relevant experimental decays. Contributions from short-range operators may prove to be equally important to, or even more important than, those from long-range Majorana neutrino exchange.
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in: SICRIS
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