Kaziewicz, Philip Bernard; (1996) Energy flows in deep inelastic scattering at HERA. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

The transverse hadronic energy flow has been measured in DIS events detected in the 1993 and 1994 running periods at ZEUS on the HERA ring. The flow has been measured in Q2 and y bins throughout the kinematic range available at HERA for diffractive and non-diffractive events. The flow measurement has been made using the ZEUS calorimeter with special attention paid to the very forward region of the component: this is the region which maps to the y*p central region at low x and low Q2 the region where an energy flow measurement is considered to be an unambiguous signal for the presence of BFKL dynamics. In the measurement of these flows, a geometric unfolding procedure rather than a bin-to-bin correction has been developed. Various sources of experimental systematic error are discussed and their effects estimated. The level of transverse energy flow is found to be generally well described by the colour dipole model but not by the matrix element parton shower simulation. The shape of the transverse energy flow in the current jet region at low x and low Q2 is not well described by any model used. An unambiguous signal for BFKL dynamics has not been found in this analysis mainly as a result of uncertainties in parton fragmentation.

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