A comprehensive EFT global fit to semi-leptonic charged-current transitions of the light quarks

This Letter of Interest (LOI) proposes to systematically study the physics beyond the standard model (BSM) in the (charged-current) semi-leptonic light-quark transitions. Our proposal encompasses the exploration, within the framework of the SMEFT, of the precise data resulting from ongoing experiments measuring nuclear, neutron, kaon, hyperon and tau decays, together with LHC data on mono-lepton and di-lepton searches at high-pT . This should spearhead the development of a global fit including also heavy-quark decay data and considering also CP-violation.

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