Makkar, Paul L.; (1994) Studies of deep inelastic scattering at HERA. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

This thesis contains investigations of electron proton scattering at the HERA collider, DESY, Hamburg. Particular emphasis is placed on measuring deep inelastic scattering events at low values of Bjorken x (approximately < 10-3</super>), using the ZEUS detector. The research was conducted before, and during, the operation of HERA. Before HERA came online, the feasibility of making measurements of physics at low x, using the ZEUS detector, was uncertain. Studies were carried out on triggering, identifying and measuring the kinematics of low x events using the ZEUS detector. With respect to triggering, careful consideration was also given to the largest backgrounds, induced by the proton beam. In the spring of 1992, HERA produced it's first luminosity runs. The data acquired by ZEUS came mainly from the proton beam background, as expected. Efforts made to reduce this data to a clean sample of deep inelastic scattering events are presented. The culmination of this thesis is a study of the hadronic final state at low x. At HERA energies, the hadronic final state depends strongly on the approximations used to calculate the perturbative (QCD) phase of the interaction. A comparison was made between Monte Carlo's incorporating different methods to approximate the QCD phase with data. Work carried out on the gas monitoring system of the central tracking detector is presented at the beginning of this thesis. The gas monitors consisted of mini drift chambers and proportional tubes. Work consisted of making these monitors operational and assessing and implementing the read out required for the system.

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