2026-09-20T16:40:53Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/35207 2023-07-11 col_2142_8859 col_2142_5131 com_2142_8858 com_2142_234 com_2142_5130

Vickey, Trevor Neil 2012-11-11T17:57:23Z 2012-11-11T17:57:23Z 10000-01-01 2004 A measurement of the polarization of the W boson from top quark decay is an excellent test of the V-A form of the charged-current weak interaction in the standard model. Since the longitudinal W boson is intimately related to the electroweak symmetry breaking mechanism, and the standard model gives a specific prediction for the fraction longitudinal W bosons from top decays, it is of particular interest for study. This thesis presents a measurement of W boson polarization in top quark decays through an analysis of the co9 distribution in the lepton-plus-jets channel of the tt candidate events from pp collisions at (see document for equation). This measurement uses an integrated luminosity of (see document) of data collection with the CDF Run II detector, resulting in 31 tt candidate events with at least one identified 5 jet. Using a binned likelihood fit to the co9 distribution from the tt candidate events found in this sample, the fraction of W bosons with longitudinal polarization is determined to be (equation. This result is consistent with the standard model prediction, gives a top quark mass of 174.3 GeV/e2, of (see document). Submitted by Elias Lopez (erlopez2@illinois.edu) on 2012-11-11T17:57:23Z No. of bitstreams: 1 Vickey_Trevor_Neil.pdf: 1688153 bytes, checksum: 18ee306db6834fbdc0c5191d41e0e8ed (MD5) Made available in DSpace on 2012-11-11T17:57:23Z (GMT). No. of bitstreams: 1 Vickey_Trevor_Neil.pdf: 1688153 bytes, checksum: 18ee306db6834fbdc0c5191d41e0e8ed (MD5) Previous issue date: 2004 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Elias Lopez (erlopez2@illinois.edu) on 2012-11-14T02:37:09Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:35:26-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Publisher has not yet granted open access permission Publisher has not yet granted open access permission U of I Only http://hdl.handle.net/2142/35207 en © 2004 Neil Polarization; Quark; W-Boson, electroweak; boson; gluon; qcd; fitter; non-w; mistag; chamber-calibration; wireplane; muon; five-dimentional; vertex; hardonization; scintillator; dark-current; source-runs Measurement of W Boson Polarization in Top Quark Decay Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.