An Explanation of the CDF Dijet Anomaly within a $U(1)_X$ Stueckelberg Extension

TL;DR

This paper explores the CDF dijet anomaly using a $U(1)_X$ Stueckelberg extension of the Standard Model, proposing a new gauge boson that couples only to quarks and analyzing its implications at Tevatron and LHC energies.

Contribution

It introduces a novel $U(1)_X$ Stueckelberg extension model to explain the dijet excess and provides predictions for collider signals at Tevatron and LHC.

Findings

The model can account for the CDF dijet excess.

Predictions for $Zjj$ and $\gamma jj$ production at Tevatron.

Dijet signals expected at LHC energies.

Abstract

We discuss the recent excess seen by the CDF Collaboration in the dijet invariant mass distribution produced in association with a $W$ boson. We analyze the possibility of such a signal within the context of a $U(1)_X$ Stueckelberg extension of the Standard Model where the new gauge boson couples only to quarks. In addition to the analysis of the $Wjj$ anomaly we also discuss the production of $Zjj$ and $\gamma jj$ at the Tevatron. The analysis is then extended to the Large Hadron Collider with $\sqrt{s}=7 {\rm TeV}$ and predictions for the dijet signals are made.