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2017

Pitfalls of iterative pole mass calculation in electroweak multiplets

McKay, James, Scott, Pat, Athron, Peter

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The radiatively-induced mass splitting between components of an electroweak multiplet is typically of order 100 MeV.

This is sufficient to endow the charged components with macroscopically-observable lifetimes, and ensure an electrically-neutral dark matter particle.
We 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.
By estimating the uncertainties of the two one-loop results, we show that the iterative procedure is significantly more sensitive to the choice of renormalisation scale and gauge parameter than the non-iterative method.

Pitfalls of iterative pole mass calculation in electroweak multiplets · Around

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