The CPLEAR experiment is a high precision experiment aiming to measure several CP violating parameters in the neutral kaon system. In order to decouple the errors on the phase angles of these parameters with the error on the KL- Ks mass difference (~m), the experiment will also make a measurement of ~m from semileptonic neutral kaon decays. This thesis describes a preliminary determination of ~m from a time dependent asymmetry in the semileptonic decays of tagged KOs and KOs. In order to select a sample of semileptonic decays it was necessary to develop a method of separating electron and pion tracks. The electromagnetic calorimeter can only separate electrons and pions at momenta above 200 MeVIc. In this thesis the development of a method of separating the two types of particle at momenta below 250 MeV[c is also described. From data collected between September 1990 and October 1991, a sample of 45000 semileptonic decays has been isolated and a value of the mass difference determined to be ~mhs = 0.477 ± 0.016(stat.) +-00..000014 } (syst.)
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:317245 |
| Date | January 1992 |
| Creators | Maley, Paul David |
| Publisher | University of Liverpool |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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