New structures in the proton-antiproton system

Abstract

In the most recent measurements of the reaction $e^+e^- \rightarrow p\bar{p}$ by the BABAR collaboration, new structures have been found with unknown origin. We examine a possible relation of the most distinct peak to the recently observed $Φ(2170)$. Alternatively, we analyse possible explanations due to the nucleon$\,\barΔ$ and $Δ\barΔ$ thresholds. The latter could explain a periodicity found in the data.