2008 JINST TH 004
M.Sc. degree thesis
Nuclear Physics Division Jagiellonian University, Poland, in 2008
Supervisor: Paweł Moskal
Merging and splitting of clusters in the
electromagnetic calorimeter of the KLOE detector
Detector modelling and simulations I
Solid state detectors
The work was carried out in the framework of the KLOE collaboration studying the decays of the phi meson produced in
the DAFNE accelerator in the collisions of electron and positron.
The main aim of this thesis was investigation of the influence of the merging and splitting of clusters in decays with the high
multiplicity of gamma quanta, which are at most biased by these effects.
For this aim we implemented the full geometry and realistic material composition of the barrel electromagnetic calorimeter in
FLUKA package. The prepared Monte Carlo based simulation program permits to achieve a fast generation of the
detector response separately for each interested reaction.
The program was used to study the reconstruction efficiency with the KLOE clustering algorithm as a
function of the photocathode quantum efficiency.
It was also used to investigate
merging and splitting probabilities as a function of the quantum efficiency.
The conducted studies indicated that the increase of quantum efficiency does not improve significantly the identification of clusters.
The influence of these effects was estimated for eta meson decays into 3 pi0 and K_short meson into 2 pi0.