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SUMMARY:Luigi Bresciani\, "All-Order Helicity Selection Rules in EFTs"
DTSTART:20261022T113000Z
DTEND:20261022T123000Z
DTSTAMP:20261025T185600Z
UID:indico-event-1722777@indico.cern.ch
DESCRIPTION:On-shell methods provide a powerful framework for uncovering g
 eneral patterns in the renormalization of EFTs. In this talk\, I will pres
 ent an all-order non-renormalization theorem for general four-dimensional 
 EFTs\, derived from Poincaré invariance and unitarity. The theorem identi
 fies classes of operator mixing that must vanish at a given loop order\, b
 ased entirely on tree-level information. These zeros are also robust under
  finite renormalizations\, provided the operator-length selection rule is 
 preserved. Applying the theorem to operators of dimensions five through ei
 ght\, we uncover broad classes of previously unknown non-renormalization p
 atterns\, with particular emphasis on two loops. Finally\, I will discuss 
 how these results provide useful consistency checks for existing and futur
 e anomalous-dimension calculations\, including those in the SMEFT.\n\n\n\n
 \n\n\n\n\nhttps://indico.cern.ch/event/1722777/\n\nZoom: https://cern.zoom
 .us/j/65562333965?pwd=VUcvclhVMnBkSXFlcTlCRVltd1VRUT09
LOCATION:4/2-037 - TH meeting room (CERN)
URL:https://indico.cern.ch/event/1722777/
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