Abstract
We discuss the phenomenology of right-handed charged currents in the frame-work of the Standard Model Effective Field Theory, in which they arise due to a single gauge-invariant dimension-six operator. We study the manifestations of the nine complex couplings of the W to right-handed quarks in collider physics, flavor physics, and low-energy precision measurements. We first obtain constraints on the couplings under the assumption that the right-handed operator is the dominant correction to the Standard Model at observable energies. We subsequently study the impact of degeneracies with other Beyond-the-Standard-Model effective interactions and identify observables, both at colliders and low-energy experiments, that would uniquely point to right-handed charged currents.
Highlights
The existence of right-handed charged currents (RHCC) is a distinctive signature of leftright symmetric extensions of the Standard Model (SM) [1,2,3]
We focus on W production, associated production of a W and a Higgs boson, Higgs production via vector boson fusion, and single-top production, as we expect these processes to be the most sensitive to RHCC
We start by analyzing the tree-level contributions to semileptonic and four-quark operators and discuss the loop-level operators that are relevant for electric dipole moments (EDMs) (∆F = 0) and rare flavor-changing neutral-current (FCNC) processes such as B → Xqγ and KL → π0e+e− (∆F = 1)
Summary
The existence of right-handed charged currents (RHCC) is a distinctive signature of leftright symmetric extensions of the Standard Model (SM) [1,2,3]. In this set-up, after integrating out the heavy right-handed W boson, we can identify ξij ∼ (κκ /vR2 )(VR)ijeiα where κ and κ are vacuum expectation values of the order of the electroweak scale, vR v is the right-handed scale, α is a CP-violating phase arising from the extended Higgs sector of the model, and VR the right-handed analogue of the CKM matrix With further assumptions, such as explicit P and/or C symmetry at high energies, VR can even be calculated in terms of SM quantities, such as quark masses and CKM elements, and the new model parameters κ, κ , and α [8,9,10].
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