Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 45: Poster – Hadronenstruktur und -spektroskopie
HK 45.8: Poster
Donnerstag, 22. März 2012, 14:00–16:00, P Foyer
A Kinematic Refit for the analysis of the reaction p p → p K+ Λ at 3.1 GeV with FOPI* — •Dominik Pleiner — Excellence Cluster Universe, TU München, Boltzmannstr. 8, D-85748 Garching
In order to study the existence of the ppK− kaonic bound state, the FOPI experiment at GSI took data with a 3.1 GeV/c proton beam hitting a LH2 target in August 2009. The reaction of interest is p p → p K+ Λ, where the Λ further decays into a proton and a π−. In order to improve the momentum and mass resolution of the reconstructed Λ, a kinematic refit was developed. The refit imposes the knowledge of several physical processes on the track-fitting by introducing certain constraints on the reconstructed tracks of the final reaction p p → p K+ p π−. In addition to several non-vertex constraints (e.g. energy/momentum conservation, invariant mass), also vertex constraints are applied.
The improvement of the momentum resolution of the refitted particles is quantified via elastic pp reactions, exploiting the ability to precisely predict the theoretical momentum of the protons by measuring their polar angles.
The poster will present the basic functioning as well as tests and preliminary results of the kinematic refit.
* supported by BMBF and Excellence Cluster "Universe"