EWPD Constraints on Flavor Symmetric Vector Fields

TL;DR

This paper analyzes how electroweak precision data constrain flavor symmetric vector fields, identifying models that are compatible with current data and can address anomalies and Higgs mass bounds.

Contribution

It provides a comprehensive study of flavor multiplets of spin one that couple to quark bi-linears without breaking flavor symmetry, exploring their viability and implications.

Findings

Flavor safe vector masses near the electroweak scale are allowed.

Certain vector fields can explain the t tbar forward-backward anomaly.

These fields can also raise the Standard Model Higgs mass bounds.

Abstract

Electroweak precision data constraints on flavor symmetric vector fields are determined. The flavor multiplets of spin one that we examine are the complete set of fields that couple to quark bi-linears at tree level while not initially breaking the quark global flavor symmetry group. Flavor safe vector masses proximate to, and in some cases below, the electroweak symmetry breaking scale are found to be allowed. Many of these fields provide a flavor safe mechanism to explain the t tbar forward backward anomaly, and can simultaneously significantly raise the allowed values of the Standard Model Higgs mass consistent with electroweak precision data.