Searches for new interactions within the SMEFT framework at the LHC – Luca Mantani (DAMTP)

October 22, 2021 @ 4:00 pm – 5:00 pm
Virtual Seminar
Maeve Madigan

The existence of Beyond Standard Model (BSM) physics is firmly suggested by both experimental observations (Dark Matter, neutrino masses) and theoretical arguments. In the hypothesis that the scale of new physics is considerably higher than the energies probed at colliders, we can parametrise modified interactions induced by BSM effects among SM particles in a model-independent framework, the Standard Model Effective Field Theory (SMEFT). Searches for indirect evidence of new physics are conceptually different from the direct ones that have characterised the first part of the LHC program, and both experimental and phenomenological studies are needed in order to maximise the chances of uncovering a BSM signal. A characteristic feature of modified interactions is that they can induce unitarity violating effects which can be exploited to gain sensitivity. In this direction, a study of the top quark electroweak sector will be presented, focusing on 2 → 2 scatterings and their embeddings in physical processes at colliders. One of the key features of the SMEFT is that deviations from the SM interactions are correlated and global interpretations are therefore of fundamental importance. A combined interpretation of the Higgs, top and diboson data from the LHC will be presented and the interplay between the various datasets discussed.

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