Constraining dark matter with renormalisation and global fits

James McKay
I present precision two-loop corrections of O(MeV) mass splittings in electroweak multiplets. These are relevant for both collider phenomenology and dark matter and can affect particle lifetimes by up to 40%. I then show that a commonly used iterative procedure to compute radiatively-corrected pole masses can lead to very different mass splittings than a non-iterative calculation at the same loop order. I show that this has significant phenomenological impact, leading to the conclusion that the...
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