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Title: Search for new physics with boosted Z bosons at CMS and development of an IP-based conrol protocol for the CMS upgrades
Author: Williams, Thomas Stephen
ISNI:       0000 0004 5920 5609
Awarding Body: University of Bristol
Current Institution: University of Bristol
Date of Award: 2014
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From 2009 to 2012, the Large Hadron Collider has been colliding proton beams at centre-of-mass energies from 900GeV to 8 TeV. The particles produced from these collisions have been recorded using the Compact Muon Solenoid (CMS) detector, with the purpose of investigating the predictions of the Standard Model of particle physics, and searching for phenomena predicted by theories of physics beyond the Standard Model. A search for new heavy particles whose decays involve boosted Z bosons is presented, based on the di-electron decay channel, using 19.7 fb - 1 of Vs = 8 TeV pp collision data collected by the CMS detector in 2012. In the context of this search, the selection efficiency for highly-boosted Z bosons has been studied extensively in both data and simulation. No evidence for new particles is observed, and upper limits on the cross section for production of excited quarks are obtained. The analysis excludes, at 95 % confidence level, the production of excited quarks decaying to qZ for excited quark masses below 2.6 Te V (3.0 Te V) in gauge (contact) interaction production modes, under the standard assumption of f = f1 = fs = 1. In order to facilitate improvements in the performance of the CMS detector for higher-luminosity conditions from 2015, many of its electronics systems are being upgraded. The new off-detector electronics will be based on the μTCA standard, which does not specify a hardware control protocol, but includes industry-standard data pathways such as Gigabit Ethernet. The development and testing of a new reliable version of the IPbus control protocol, along with the associated software and firmware , is presented. The software is optimised in order to increase the block write/read throughput towards the full bandwidth of Gigabit Ethernet, and to improve scalability with the number of hardware devices in the system.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available