An additional study of multi-muon events produced in {\boldmath $p\bar{p}$} collisions at {\boldmath $\sqrt{s}=1.96$} TeV

TL;DR

This study analyzes multi-muon events at the Fermilab Tevatron, revealing unexpected angular distributions that challenge existing QCD explanations and suggest new physics or unidentified processes.

Contribution

It provides new insights into multi-muon event distributions, specifically the azimuthal angle, and questions the adequacy of current QCD models in explaining these events.

Findings

Distribution of azimuthal angle differs from QCD predictions

Multi-muon events are unlikely due to misidentified muons in QCD

Results suggest potential new physics or unknown processes

Abstract

We present one additional study of multi-muon events produced at the Fermilab Tevatron collider and recorded by the CDF II detector. We use a data set acquired with a dedicated dimuon trigger and corresponding to an integrated luminosity of 3.9 fb$^{-1}$. We investigate the distribution of the azimuthal angle between the two trigger muons in events containing at least four additional muon candidates to test the compatibility of these events with originating from known QCD processes. We find that this distribution is markedly different from what is expected from such QCD processes and this observation strongly disfavours the possibility that multi-muon events result from an underestimate of the rate of misidentified muons in ordinary QCD events.