W-boson mass in the triplet seesaw model

Abstract

The CDF collaboration has recently published a precision measurement of the W-boson mass that differs from the Standard Model prediction by seven standard deviations. This result can be explained with additional electroweak multiplets that either break the custodial symmetry or contribute to oblique parameters at loop level. Here, we study one of the best-motivated scenarios involving new multiplets: the type-II seesaw model, which involves a scalar triplet that generates Majorana neutrino masses and can furthermore resolve the W-boson mass discrepancy. This favors a doubly-charged scalar with mass between 100 and 200 GeV as well as other scalars with a fixed mass splitting. The entire preferred parameter space is testable at the LHC.

6 pages; extended discussion, to appear in PRD

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• Electroweak dark matter model accounting for the CDF $W$-mass anomaly
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• Low-mass doubly-charged Higgs bosons at LHC
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• Testing the Scalar Triplet Solution to CDF's Fat $W$ Problem at the LHC
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• Anatomy of the Real Higgs Triplet Model
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• Type-II Majoron Dark Matter
• $W$-Boson Mass Anomaly from a General $SU(2{)}_L$ Scalar Multiplet
• Axionic Dirac seesaw and electroweak vacuum stability
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• $E_6$ Models in Light of Precision $M_W$ Measurements
• Precision Higgs Boson Probe of Type-II Seesaw Models
• Decaying scalar dark matter in the minimal left-right symmetric model
• $B-L$ model in light of the CDF II result
• Oblique corrections when $m_W\ne m_Z\cos {\theta }_W$ at tree level
• Accommodating the CDF W-boson Mass Measurement in the Beautiful Mirror Model
• Parallel Seesaw Mechanisms for Neutrinos and Freeze-In Long-Lived Dark Matter