Electroweak precision tests for triplet scalars

Abstract

Electroweak precision observables are fundamentally important for testing the standard model (SM) or its extensions. The influences to observables from new physics within the electroweak sector can be expressed in terms of oblique parameters S, T, U. The recently reported W mass excess anomaly by CDF modifies these parameters in a significant way. By performing the global fit with the CDF new W mass measurement data, we obtain $S=0.03\pm 0.03$, $T=0.06\pm 0.02$ and $U=0.16\pm 0.03$ (or $S=0.14\pm 0.03$, $T=0.24\pm 0.02$ with $U=0$) which is significantly away from zero as SM would predict. The CDF excess strongly indicates the need of new physics beyond SM. We carry out a global fit to study the influence of two different cases of simple extensions by a hyper-charge $Y=1$ triplet scalar $\Delta$ (corresponding to the type-II seesaw model) and a $Y=0$ real triplet scalar $\Sigma$ on electroweak precision tests to determine parameter space in these models to solve the W mass anomaly and discuss the implications. We find that these triplets can affect the oblique parameters significantly at the tree and loop levels.

19 pages, 4 figures. The results has changed

References in corpus (7)

• Cosmology and Astrophysics of Minimal Dark Matter
• Triplet Scalars and Dark Matter at the LHC
• Bounds on the mass of doubly-charged Higgs bosons in the same-sign diboson decay scenario
• (Non)decoupling of the Higgs triplet effects
• Type-II Seesaw Triplet Scalar Effects on Neutrino Trident Scattering
• Low-Energy Effective Theory, Unitarity, and Non-Decoupling Behavior in a Model with Heavy Higgs-Triplet Fields
• Compatibility of muon $g-2$, $W$ mass anomaly in type-X 2HDM

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• Testing the Scalar Triplet Solution to CDF's Fat $W$ Problem at the LHC
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• Minimal model for the $W$-boson mass, $(g-2{)}_{\mu }$, $h\to {\mu }^{+}{\mu }^{-}$ and quark-mixing-matrix unitarity
• Custodial Symmetry Breaking and Higgs Signatures at the LHC
• Anatomy of the Real Higgs Triplet Model
• Type-II Majoron Dark Matter
• Resurrecting the LHC discovery potential in the extended Type-II Seesaw Model
• Hadron Collider Signatures of Lepton Number Violation in the Type II Seesaw Model
• Precision Higgs Boson Probe of Type-II Seesaw Models
• Oblique corrections when $m_W\ne m_Z\cos {\theta }_W$ at tree level
• Correlating neutrino magnetic moment and scalar triplet dark matter to enlighten XENONnT bounds in a Type-II model
• Phenomenological study of a gauged $L_{\mu }-L_{\tau }$ model with a scalar leptoquark
• Two dark matter candidates in a doublet-triplet Higgs model