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Systematic study of the d=5 Weinberg operator at one-loop order

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Systematic study of the d=5 Weinberg operator at one-loop order

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dc.contributor.author Bonnet, Florian
dc.contributor.author Hirsch, Martin
dc.contributor.author Ota, Toshihiko
dc.contributor.author Winter, Walter
dc.date.accessioned 2014-08-26T10:12:00Z
dc.date.available 2014-08-26T10:12:00Z
dc.date.issued 2012
dc.identifier.citation Bonnet, Florian Hirsch, Martin Ota, Toshihiko Winter, Walter 2012 Systematic study of the d=5 Weinberg operator at one-loop order Journal of High Energy Physics 07 7 153
dc.identifier.uri http://hdl.handle.net/10550/37408
dc.description.abstract We perform a systematic study of the d = 5 Weinberg operator at the one-loop level. We identify three different categories of neutrino mass generation: (1) finite irreducible diagrams; (2) finite extensions of the usual seesaw mechanisms at one-loop and (3) divergent loop realizations of the seesaws. All radiative one-loop neutrino mass models must fall in to one of these classes. Case (1) gives the leading contribution to neutrino mass naturally and a classic example of this class is the Zee model. We demonstrate that in order to prevent that a tree level contribution dominates in case (2), Majorana fermions running in the loop and an additional Z(2) symmetry are needed for a genuinely leading one-loop contribution. In the type-II loop extensions, the Yukawa coupling will be generated at one loop, whereas the type-I/III extensions can be interpreted as loop-induced inverse or linear seesaw mechanisms. For the divergent diagrams in category (3), the tree level contribution cannot be avoided and is in fact needed as counter term to absorb the divergence.
dc.language.iso eng
dc.relation.ispartof Journal of High Energy Physics, 2012, vol. 07, num. 7, p. 153
dc.subject Física
dc.title Systematic study of the d=5 Weinberg operator at one-loop order
dc.type journal article es_ES
dc.date.updated 2014-08-26T10:12:00Z
dc.identifier.doi 10.1007/JHEP07(2012)153
dc.identifier.idgrec 080423
dc.rights.accessRights open access es_ES

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