Untersuchung neutraler pi-Mesonen mit dem elektromagnetischen Kalorimeter des BABAR-Detektors

In this thesis methods of calibration of the electromagnetic calorimeter of the BABAR experiment will be introduced. Additionally a method was developed to take into account the different energy losses between the edges and centres of the crystals. An improvement of the energy resolution of photons was achieved by 15%, depending on the energy. For Y(4S) and continuum events a momentum spectrum of inclusively produced neutral pions (Y(4S) -> pi0 X and e+e- -> q anti-q -> pi0 X, respectively) was determined. For continuum events also a momentum depending angle distribution was determined. From these distributions the average number of produced pi0 per event was calculated. The results for B decays and continuum events are n(B) =2,268+-0,008+-0,115 and n(Continuum)=3,388+-0,005+-0,172, respectively. These values were compared with Monte Carlo simulations and with other analyses.

Level thesis:degree_level

thesis.doctoral

Grantor dc:publisher

Technische Universität Dresden

Year

2003

Author dc:creator

• Maly, Enrico

Contributors dc:contributor

• Schubert, Klaus R.
• Menke, Sven
• Spaan, Bernhard

• BABAR
• Hadronen
• Kalibrierung
• Kalorimeter
• pi0
• calibration
• calorimeter
• hadrons