Leptophobic Z' Boson and Parity-Violating eD Scattering

Original · EN

We study the impact of a leptophobic Z' gauge boson on the C₁q and C₂q parameters that describe the low-energy, parity-violating electron-quark neutral current interaction. We complement previous work by including the penguin-like vertex corrections, thereby completing the analysis of one-loop calculation up to O(m²q'/M²Z') terms. We analyze the sensitivity of these probes to the different couplings Z'uq (q=u,c,t) and Z'dq (q=d,s,b), in a model-independent way that can be applied to any specific Z' scenario. We show that constraints from neutral kaon and heavy flavor studies preclude significant contributions from flavor non-diagonal couplings except for those involving top quarks. We apply our results to a light Z' with flavor diagonal couplings to up or down quarks, a scenario proposed in the literature to explained the CDF W plus di-jet anomaly. We find that such a particle would not affect the C₁q coefficients, but it would have a sizable impact on C₂q couplings that can be probed by future measurements of parity-violating deep inelastic scattering of polarized electrons off of deuterium.