Tests of non-standard electroweak couplings of right-handed quarks

Abstract

The standard model can be interpreted as the leading order of a Low-Energy Effective Theory (LEET) invariant under a higher non linearly realized symmetry $S_{nat}\supset SU(2{)}_W\times U(1{)}_Y$ equipped with a systematic power counting. Within the minimal version of this ``not quite decoupling'' LEET, the dominant non-standard effect appears at next-to-leading order (NLO) and is a modification of the couplings of fermions to W and Z. In particular, the coupling of right-handed quarks to Z is modified and a direct coupling of right-handed quarks to W emerges. Charged right-handed lepton currents are forbidden by an additional discrete symmetry in the lepton sector originally designed to suppress Dirac neutrino masses. A complete NLO analysis of experimental constraints on these modified couplings is presented. Concerning couplings of light quarks, the interface of the electroweak tests with QCD aspects is discussed in detail.

56 pages, 14 figures, v2: references added, minor modifications in the text, accepted for publication in JHEP

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Cited by in corpus (14)

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• Explaining $b\to s{\ell }^{+}{\ell }^{-}$ and the Cabibbo Angle Anomaly with a Vector Triplet
• On the Statistical Treatment of the Cabibbo Angle Anomaly
• Non-standard semileptonic hyperon decays
• Matching Chiral Perturbation Theory and the Dispersive Representation of the Scalar Kpi Form Factor
• Semileptonic tau decays beyond the Standard Model
• Global Fit of Modified Quark Couplings to EW Gauge Bosons and Vector-Like Quarks in Light of the Cabibbo Angle Anomaly
• A low-energy perspective on the minimal left-right symmetric model
• Improved bounds on the radius and curvature of the K pi scalar form factor and implications to low-energy theorems
• Workshop summary -- Kaons@CERN 2023
• Anomalous processes and leading logarithms
• Dispersive representation and shape of K_{l3} form factors