CDF W mass anomaly from a dark sector with a Stueckelberg-Higgs portal

Abstract

We propose an explanation to the new W mass measurement recently reported by the CDF collaboration, which is larger than the standard model expectation by about 7 standard deviations. To alleviate the tensions that are imposed on the electroweak sector by the new W mass measurement, we carry out an analysis in the Stueckelberg extended standard model where a new neutral gauge boson appears which mixes with the two neutral gauge bosons in the electroweak sector both via the Stueckelberg mass terms and via the gauge invariant Stueckelberg-Higgs portal interaction and spoils the custodial symmetry at the tree level so that the simple relation between the W boson mass and the Z boson mass does not hold. We find that such an extension increases the W boson mass if the new gauge boson mass is larger than the Z boson mass. We further show that there exists a significant part of the parameter space in the extended model which includes the CDF mass anomaly and is consistent with the various observables at the Z pole and consistent with the ATLAS dilepton limits. The Stueckelberg $Z_{\mathrm{St}}^{\prime }$ boson, which resolves the CDF W mass anomaly, should be searchable in future LHC experiments.

v1, 6 pages, 2 figures. v2, refs added

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• The CDF W-mass, muon g-2, and dark matter in a $U(1{)}_{L_{\mu }-L_{\tau }}$ model with vector-like leptons
• Combined constraints on dark photons and discovery prospects at the LHC and the Forward Physics Facility
• CDF-II W boson mass in the Dirac Scotogenic model
• Using $\gamma$-ray observations of dwarf spheroidal galaxies to test the possible common origin of the W-boson mass anomaly and the GeV $\gamma$-ray/antiproton excesses
• An alternative gauged $U(1{)}_R$ symmetric model in light of the CDF II $W$ boson mass anomaly
• $E_6$ Models in Light of Precision $M_W$ Measurements
• Particle physics and cosmology intertwined
• Accommodating the CDF W-boson Mass Measurement in the Beautiful Mirror Model
• Gauge-independent Gravitational Waves from Cogenesis in a $B-L$ Conserving Universe