A Measurement of the Proton's Weak Charge Using an Integration Cerenkov Detector System

dc.contributor.authorWang, Peiqing
dc.contributor.examiningcommitteeGwinner, Gerald (Physics & Astronomy), Martin, Jeffrey (Physics & Astronomy), Goltz, Douglas (Chemistry), Huber, Garth (Physics, U. of Regina)en_US
dc.contributor.supervisorGericke, Michael (Physics & Astronomy)en_US
dc.degree.disciplinePhysics and Astronomyen_US
dc.degree.levelDoctor of Philosophy (Ph.D.)en_US
dc.description.abstractThe Q-weak experiment at Thomas Jefferson National Accelerator Facility (USA) will make a precision determination of the proton weak charge with approximately 4% combined statistical and systematic uncertainties via a measurement of the parity violating asymmetry in elastic electron-proton scattering at very low momentum transfer and forward angle. This will allow an extraction of the weak mixing angle at Q^2=0.026 (GeV/c)^2 to approximately 0.3%. The weak mixing angle is a fundamental parameter in the Standard Model of electroweak interactions. At the proposed accuracy, a measured deviation of this parameter from the predicted value would indicate new physics beyond what is currently described in the Standard Model. Without deviation from the predicted value, this measurement would place stringent limits on possible extensions to the Standard Model and constitute the most precise measurement of the proton's weak charge to date. The key experimental apparatus include a liquid hydrogen target, a toroidal magnetic spectrometer and a set of eight Cerenkov detectors. The Cerenkov detectors form the main detector system for the Q-weak experiment and are used to measure the parity violating asymmetry during the primary Q-weak production runs. The Cerenkov detectors form the main subject of this thesis. Following a brief introduction to the experiment, the design, development, construction, installation, and testing of this detector system will be discussed in detail. This is followed by a detailed discussion of detector diagnostic data analysis and the corresponding detector performance. The experiment has been successfully constructed and commissioned, and is currently taking data. The thesis will conclude with a discussion of the preliminary analysis of a small portion of the liquid hydrogen data.en_US
dc.description.noteOctober 2011en_US
dc.rightsopen accessen_US
dc.subjectStandard Modelen_US
dc.subjectweak Interactionen_US
dc.subjectweak mixing angleen_US
dc.subjectweak chargeen_US
dc.subjectelectron-proton scatteringen_US
dc.subjectparity violationen_US
dc.subjectCerenkov detectoren_US
dc.subjectmomentum transferen_US
dc.subjectcross-section asymmetryen_US
dc.subjecthadronic structureen_US
dc.subjectform factoren_US
dc.titleA Measurement of the Proton's Weak Charge Using an Integration Cerenkov Detector Systemen_US
dc.typedoctoral thesisen_US
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