<p>This diploma thesis presents a preliminary study of the ratio of branching ratio r = BR(η → 3π<sup>0</sup>) / BR(η → π<sup>+</sup> π<sup>- </sup>π<sup>0</sup>). The experimental data used is collected by WASA-at-COSY which is a 4π sr detector optimised to detect light mesons and their decay products and is situated in Jülich, Germany.The focus of the work is to see how different reconstruction methods for the detected particles can alter both the measured values of the branching ratios and the luminosity dependence of these branching ratios. The results show that for some of the methods, the measured branching ratios have a clear luminosity dependence. Depending on method, the extracted branching ratios vary differently. A few different methods have been studied, so the results provides a qualitative understanding of the behaviour of the measured branching ratios for different luminosities.</p>
| Identifer | oai:union.ndltd.org:UPSALLA/oai:DiVA.org:uu-126172 |
| Date | January 2010 |
| Creators | Heijkenskjöld, Lena |
| Publisher | Uppsala University, Nuclear and Particle Physics |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, text |
| Relation | FYSAST |
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