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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/30717

Title: Effective Lagrangian approach to neutrinoless double beta decay and neutrino masses
Authors: Águila Giménez, Francisco del
Aparici, Alberto
Bhattacharya, S.
Santamaria, Arcadi
Wudka, Jose
Issue Date: 2012
Abstract: Neutrinoless double beta (0νββ) decay can in general produce electrons of either chirality, in contrast with the minimal Standard Model (SM) extension with only the addition of the Weinberg operator, which predicts two left-handed electrons in the final state. We classify the lepton number violating (LNV) effective operators with two leptons of either chirality but no quarks, ordered according to the magnitude of their contribution to 0νββ decay. We point out that, for each of the three chirality assignments, e L e L , e L e R and e R e R , there is only one LNV operator of the corresponding type to lowest order, and these have dimensions 5, 7 and 9, respectively. Neutrino masses are always induced by these extra operators but can be delayed to one or two loops, depending on the number of RH leptons entering in the operator. Then, the comparison of the 0νββ decay rate and neutrino masses should indicate the effective scenario at work, which confronted with the LHC searches should also eventually decide on the specific model elected by nature. We also list the SM additions generating these operators upon integration of the heavy modes, and discuss simple realistic examples of renormalizable theories for each case.
Publisher: Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Keywords: Beyond Standard Model
Neutrino Physics
URI: http://hdl.handle.net/10481/30717
ISSN: 1029-8479
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Águila, F.; et al. Effective Lagrangian approach to neutrinoless double beta decay and neutrino masses. Journal of High Energy Physics, 2012: 146 (2012). [http://hdl.handle.net/10481/30717]
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