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Building blocks of the flavourful SMEFT RG

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If you have a question about this talk, please contact Maeve Madigan .

An effective field theory’s power lies in the possibility of connecting scales through renormalisation group flow, encapsulated in the anomalous dimensions of the operators. The anomalous dimension matrix of the SMEFT encodes clues towards where to find relics of heavy new physics in data, but its unwieldy 2499×2499 size (at operator dimension six) makes it difficult to draw general conclusions. In this talk, I will review recent progress on understanding the structure of the matrix using on-shell methods. Pairing this with a flavour decomposition of the Wilson coefficient matrices, I will show that small subsystems emerge which mix almost exclusively amongst themselves. This deconstruction of the RGEs provides a first step to understanding the IR-attractive directions in the SMEFT parameter space, hence closing in on natural places for heavy new physics to make itself known.

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.

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Seminar Room 2, IfM, 17 Charles Babbage Road Cambridge University Engineering Department, Lecture room 3A Trinity Hall, Main Lecture Theatre, Trinity Lane, Cambridge CB2 1TJ

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