New physics interpretation of W -boson mass anomaly

Abstract

The CDF Collaboration has recently reported an updated result on the $W$-boson mass measurement, showing a $7\ensuremath{\sigma}$ deviation from the standard model prediction. The discrepancy may indicate new contributions to the Fermi coupling constant. We study simple extensions of the standard model by introducing an extra scalar, fermion, or vector field. It is found that the tension implies the new physics existing in multi-TeV scales if the new coupling to the electron and/or muon is of order unity.