$\eta$ meson reconstruction in pp reactions at 2.2 GeV with HADES

TL;DR

This paper reports on the reconstruction of $ta$ mesons in proton-proton collisions at 2.2 GeV using the HADES spectrometer, focusing on decay channels and comparing results to existing data and theories.

Contribution

It introduces analysis techniques for $ta$ meson reconstruction in pp reactions at 2.2 GeV and provides first experimental results for $ta$ production.

Findings

Reconstructed $ta$ meson distributions in pp collisions at 2.2 GeV.

Comparison of experimental results with other experiments and theoretical models.

First results on $ta$ production at this energy.

Abstract

The HADES spectrometer installed at GSI Darmstadt is devoted to study the production of di-electron pairs from proton, pion and nucleus induced reactions at 1-2 AGeV. In pp collisions at 2.2 GeV we have focused mainly on exclusive reconstruction of the $\eta$ meson decays in the hadronic ($\eta\to\pi^{+}\pi^{-}\pi^{0}$) and the electromagnetic channels ($\eta\to e^{+}e^{-}\gamma$). We present analysis techniques and discuss first results on $\eta$ production, with the main focus on comparisons of reconstructed distributions to results obtained by other experiments and theoretical predictions.