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DTSTART;TZID=Europe/Ljubljana:20260312T110000
DTEND;TZID=Europe/Ljubljana:20260312T120000
DTSTAMP:20260422T031622
CREATED:20260226T170638Z
LAST-MODIFIED:20260312T105109Z
UID:89035-1773313200-1773316800@web-f1.ijs.si
SUMMARY:Fabian Esser: Higher-dimensional SMEFT operators and UV models for neutrinoless double beta decay
DESCRIPTION:The observation of lepton number violation (LNV) would be clear evidence for physics beyond the Standard Model\, and non-zero neutrino masses particularly motivate a study of processes that violate lepton number by two units\, like e.g. neutrinoless double beta decay. In the Standard Model Effective Field Theory (SMEFT)\, a ubiquitous framework used for indirect new physics searches\, $Delta L =2$ operators appear at dimension-5 and higher odd dimensions. Focusing on dimension-9 operators\, I will present a diagram-based classification of tree-level UV models and isolate minimal two-particle models that avoid generating the dimension-5 operator or dimension-7 LNV operators at tree level. I then chart how these minimal models populate the operator landscape and organise them by the loop order at which they radiatively induce lower-dimensional LNV operators\, highlighting sce- narios in which the tree-level dimension-9 contribution can compete with or dominate loop-suppressed neutrino-mass (dimension-5) effects. Finally\, I will show representative one-loop and two- loop models\, their matching onto the SMEFT\, and their implications for neutrino masses\, charged-lepton flavour violation\, and the relative size of dimension-9 versus dimension-5 contributions to 0νββ.\nhttps://indico.ijs.si/event/3692/
URL:https://web-f1.ijs.si/event/fabian-esser/
LOCATION:A/1-106 – Seminarska soba fizike (F5)
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