The CDF dijet excess from intrinsic quarks

TL;DR

This paper suggests that intrinsic strange quarks within the nucleon could explain the CDF W+dijet excess, linking it to single top production, while explaining the lack of Z+dijet excess.

Contribution

It proposes a novel explanation for the CDF excess based on intrinsic quark contributions, contrasting with previous new particle hypotheses.

Findings

Intrinsic strange quarks significantly contribute to W+single top production.

W+single top production can account for the W+dijet excess observed by CDF.

No significant deviation found in Z+dijet events, constraining new physics explanations.

Abstract

The CDF collaboration reported an excess in the production of two jets in association with a $W$. We discuss constraints on possible new particle state interpretations of this excess. The fact of no statistically significant deviation from the SM expectation for {$Z$+dijet} events in CDF data disfavors the new particle explanation. We show that the nucleon intrinsic strange quarks provide an important contribution to the $W$ boson production in association with a single top quark production. Such {$W$+t} single top quark production can contribute to the CDF {$W$+dijet} excess, thus the nucleon intrinsic quarks can provide a possible explanation to the CDF excess in {$W$+dijet} but not in {$Z$+dijet} events.