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Digital calorimetry for future e\(^+\)e\(^-\) linear colliders and their impact on the precision measurement of the top Higgs Yukawa coupling

Price, Tony (2013)
Ph.D. thesis, University of Birmingham.

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Abstract

The International Linear Collider (ILC) is a proposed future e\(^+\)e\(^-\) linear collider which will make precise measurements of the Standard Model of Particle Physics. Novel detector systems with unprecedented performance are required to allow these measurements. This thesis focuses on the validation of a Digital Electromagnetic Calorimeter (DECAL) which infers the energy of the incident particles by counting the number of pixel fired (particles) in the shower rather than the energy deposited.The TPAC sensor has been developed for use as the active layer of a DECAL and its properties have been studied during beam tests at CERN and DESY. Data from these tests has been used to validate the DECAL concept by showing that pixel multiplicity increases with incident particle energy and material depth as expected for electromagnetic shower development. The radiation hardness of the TPAC sensors was also evaluated with a reduction in the signal to noise ratio of 8 % observed at doses up to 200 krad. The semileptonic decay of e\(^+\)e\(^-\) \(\rightarrow\) ttH has been studied at 1 TeV to evaluate the performance of the International Large Detector (ILD) yielding a predicted uncertainty on the measurement of the top Higgs Yukawa coupling of 6.9% with 1000 fb\(^-\)\(^1\) of data. An investigation into the effect of the inclusion of a DECAL has yielded results consistent with a conventional calorimeter system.

Type of Work:Ph.D. thesis.
Supervisor(s):Watson, Nigel
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Physics and Astronomy
Subjects:QB Astronomy
T Technology (General)
Institution:University of Birmingham
ID Code:4515
This unpublished thesis/dissertation is copyright of the author and/or third parties.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.
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