Beta-decay implications for the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>W</mml:mi></mml:mrow></mml:math>-boson mass anomaly

Abstract

We point out the necessity to consider $\ensuremath{\beta}$-decay observables in resolutions of the $W$-boson anomaly in the Standard Model Effective Field Theory that go beyond pure oblique corrections. We demonstrate that present global analyses that explain the $W$-boson mass anomaly predict a large, percent-level, violation of first-row Cabibbo Kobayashi Maskawa unitarity. We investigate what solutions to the $W$-boson mass anomaly survive after including $\ensuremath{\beta}$-decay constraints.

Topics & Concepts