A unified, flavor symmetric explanation for the t-tbar asymmetry and Wjj excess at CDF

TL;DR

This paper proposes a flavor symmetric model that simultaneously explains the CDF anomalies in t-tbar asymmetry and W+jj excess, predicting related effects in other channels with safety considerations.

Contribution

It introduces a simple, renormalizable flavor symmetry model unifying explanations for multiple CDF anomalies, with specific predictions for related asymmetries and distributions.

Findings

Explains both t-tbar asymmetry and W+jj excess with a single model.

Predicts a similar asymmetry in c-cbar channels.

Foresees a suppressed Z+jj bump in the model.

Abstract

We present a simple, perturbative, and renormalizable model with a flavor symmetry which can explain both the t-tbar forward-backward asymmetry and the bump feature present in the dijet mass distribution of the W+jj sample in the range 120-160 GeV that was recently reported by the CDF collaboration. The flavor symmetry not only ensures the flavor/CP safety of the model, but also relates the two anomalies unambiguously. It predicts a comparable forward-backward asymmetry in c-cbar. The forward-backward asymmetry in b-bar is, however, small. A bump in the dijet mass distribution in Z+jj sample is also predicted but with a suppressed cross-section.