SMEFT Analysis of $m_W$

Abstract

We use the Fitmaker tool to incorporate the recent CDF measurement of $m_W$ in a global fit to electroweak, Higgs, and diboson data in the Standard Model Effective Field Theory (SMEFT) including dimension-6 operators at linear order. We find that including any one of the SMEFT operators ${\mathcal{O}}_{HWB}$, ${\mathcal{O}}_{HD}$, ${\mathcal{O}}_{\ell \ell }$ or ${\mathcal{O}}_{H\ell }^{(3)}$ with a non-zero coefficient could provide a better fit than the Standard Model, with the strongest pull for ${\mathcal{O}}_{HD}$ and no tension with other electroweak precision data. We then analyse which tree-level single-field extensions of the Standard Model could generate such operator coefficients with the appropriate sign, and discuss the masses and couplings of these fields that best fit the CDF measurement and other data. In particular, the global fit favours either a singlet $Z^{\prime }$ vector boson, a scalar electroweak triplet with zero hypercharge, or a vector electroweak triplet with unit hypercharge, followed by a singlet heavy neutral lepton, all with masses in the multi-TeV range for unit coupling.

arXiv comment23 pages, 8 figures. References added, extended and clarified discussions, added discussion of the impact of enlarged uncertainties according to PDG prescription. Version accepted for publication in JHEP

References in corpus (34)

• Dimension-Six Terms in the Standard Model Lagrangian
• Update of the global electroweak fit and constraints on two-Higgs-doublet models
• Implications of Generalized Z-Z' Mixing
• Effective description of general extensions of the Standard Model: the complete tree-level dictionary
• Updated Global SMEFT Fit to Higgs, Diboson and Electroweak Data
• Top, Higgs, Diboson and Electroweak Fit to the Standard Model Effective Field Theory
• A Monte Carlo global analysis of the Standard Model Effective Field Theory: the top quark sector
• Heavy Vector Triplets: Bridging Theory and Data
• O new physics, where art thou? A global search in the top sector
• Compilation of low-energy constraints on 4-fermion operators in the SMEFT
• The Gauge-Higgs Legacy of the LHC Run II
• Observable Effects of General New Scalar Particles
• Electroweak Sector Under Scrutiny: A Combined Analysis of LHC and Electroweak Precision Data
• Model independent constraints on four-lepton operators
• The electro-weak couplings of the top and bottom quarks -- global fit and future prospects
• Top and Beauty synergies in SMEFT-fits at present and future colliders
• Obscure Higgs boson at Colliders
• Low energy SUSY confronted with new measurements of W-boson mass and muon g-2
• SMEFT analysis of vector boson scattering and diboson data from the LHC Run II
• The Flavor of UV Physics
• Flavourful SMEFT likelihood for Higgs and electroweak data
• Constraining top-quark couplings combining top-quark and $\mathbf{B}$ decay observables
• Interpreting $W$ mass measurements in the SMEFT
• The top quark electro-weak couplings after LHC Run 2
• Probing the Higgs sector of $Y=0$ Higgs Triplet Model at LHC
• Constraining the SMEFT with Bayesian reweighting
• Interdependence of the new "MUON G-2" Result and the $W$-Boson Mass
• Unified Explanation of the Anomalies in Semi-Leptonic $B$ decays and the $W$ Mass
• Global Fits of Third Family Hypercharge Models to Neutral Current B-Anomalies and Electroweak Precision Observables
• Precise prediction for the W boson mass in the MRSSM
• The Singly-Charged Scalar Singlet as the Origin of Neutrino Masses
• Vector triplets at the LHC
• Flavorful Electroweak Precision Observables in the Standard Model Effective Field Theory
• Higgs probes of top quark contact interactions and their interplay with the Higgs self-coupling