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http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/2944 http://eprints.org/relation/ispreviewThumbnailVersionOf http://etheses.bham.ac.uk/id/document/2944 http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/2944 archive 4031 disk0/00/00/11/37 2010-11-24 11:44:34 2019-01-22 10:52:25 2011-07-19 16:30:31 thesis show 0 Elhalhuli Essam Othman Jones Peter G. University of Birmingham unpub QC 10col_ephy This work has studied the particle composition of jets by determining the ratios p±/π± and K±/π± in Au + Au and d + Au collisions at √sNN = 200 GeV measured by the STAR experiment at RHIC. Jets were found by measuring the angular azimuthal correlation between particles at high transverse momentum. Jets were then identified by their back-to-back correlation. A technique was developed to identify charged particles using their specific ionisation measured in the STAR Time Projection Chamber (TPC). This thesis contains one of the first implementations of using direct photons to tag jets in heavy ion collisions. An attempt was made to extract a trigger sample rich in direct photons from neutral triggers. The hadron ratios were calculated from the jet yields as a function of transverse momentum in each collision system. Although the away side yield is suppressed in central Au + Au, there is no evidence that the relative particle yields are changed. The hadron ratios for the three systems were found to be consistent with simulated p + p events generated using the Pythia Monte Carlo event generator. This reinforces the conclusion that the fragmentation process is unchanged by interactions with the medium. 2010-12 2010-11-07 graduation eng This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder. public 160 University of Birmingham School of Physics and Astronomy d_ph na 2010-12 graduation