Measurement of the Lambda(1405) in proton proton reactions with HADES

TL;DR

This paper reports on the measurement of the Lambda(1405) resonance in proton-proton collisions at 3.5 GeV using the HADES detector, employing advanced analysis techniques to improve mass resolution and background estimation.

Contribution

It introduces a novel analysis method combining kinematic refit and sideband background estimation for studying Lambda(1405) in p+p reactions.

Findings

Successful reconstruction of Lambda(1405) in charged decay channels

Improved mass resolution through kinematic refit

Effective background modeling with sideband analysis

Abstract

We present an analysis of the Lambda(1405) resonance in p+p reactions at a kinetic beam energy of 3.5 GeV, measured by the High Acceptance Di-Electron Spectrometer (HADES). The resonance is reconstructed in the two charged decay channels Sigma^(+/-) pi^(-/+), with help of a kinematic refit, which improves the mass resolution. The high misidentification of pions and protons as kaons required the development of a sophisticated sideband analysis, which can describe the misidentification background quite well.