Measurement of the W boson+bottom-antibottom quark cross-section in 695 pb-1 of proton-antiproton collisions at CDF II.
dc.contributor.author | Soderberg, Mitchell P. | |
dc.contributor.advisor | Gerdes, David W. | |
dc.date.accessioned | 2016-08-30T16:11:45Z | |
dc.date.available | 2016-08-30T16:11:45Z | |
dc.date.issued | 2006 | |
dc.identifier.uri | http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:3238094 | |
dc.identifier.uri | https://hdl.handle.net/2027.42/126302 | |
dc.description.abstract | <italic>W</italic><super>+/-</super>+ <italic>bb¯</italic> events contain the associated production of a <italic>W</italic><super>+/- </super> boson, a pair of bottom quarks (<italic>bb¯</italic>), and any number of additional partons. This process is of much importance at hadron collider experiments due to its role as a background source in searches for Standard Model Higgs boson and single top-quark production. In this thesis the results are presented for a measurement of the <italic>b</italic>-jet cross-section in <italic>W</italic><super>+/-</super>+<italic>bb¯ </italic> events containing 1 or 2 jets in 695 pb<super>-1</super> of s =1.96 TeV <italic>pp¯</italic> collisions at the CDF experiment. This is the first measurement of the cross-section of <italic>W</italic><super> +/-</super>+<italic>bb¯</italic> performed in any experiment. The cross-section is defined to be proportional to the number of <italic>b</italic>-jets from <italic>W</italic><super>+/-</super>+<italic>bb¯</italic> events with one or two jets, and a leptonically decaying <italic>W</italic><super> +/-</super> with decay products passing kinematics cuts (<italic>p<sub> T</sub></italic>(ℓ<super>+/-</super>) ≥20.0 GeV, |eta(ℓ<super> +/-</super>)| ≤1.1, <italic>p<sub>T</sub></italic>(nu) ≥25.0 GeV). The invariant mass distribution of jets identified as containing a long-lived hadron is fit with components for bottom, charm, and light-flavor to find the fraction due to true <italic>b</italic>-decays. Background <italic>b</italic>-jet sources are subtracted to isolate the contribution of <italic>W</italic><super> +/-</super>+<italic>bb¯</italic> to the data. The cross-section is measured to be 0.90+/-0.20(stat.)+/-0.26(syst.)pb, which compares well with the leading order theoretical prediction of 0.74+/-0.18 pb. | |
dc.format.extent | 127 p. | |
dc.language | English | |
dc.language.iso | EN | |
dc.subject | Bb | |
dc.subject | Bottom-antibottom Quark | |
dc.subject | Cdf | |
dc.subject | Cross Sections | |
dc.subject | Ii | |
dc.subject | Macr | |
dc.subject | Measurement | |
dc.subject | Pb | |
dc.subject | Pp | |
dc.subject | Proton-antiproton Collisions | |
dc.subject | Section | |
dc.subject | W Boson | |
dc.subject | W Bosons | |
dc.title | Measurement of the W boson+bottom-antibottom quark cross-section in 695 pb-1 of proton-antiproton collisions at CDF II. | |
dc.type | Thesis | |
dc.description.thesisdegreename | PhD | en_US |
dc.description.thesisdegreediscipline | High energy physics | |
dc.description.thesisdegreediscipline | Pure Sciences | |
dc.description.thesisdegreegrantor | University of Michigan, Horace H. Rackham School of Graduate Studies | |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/126302/2/3238094.pdf | |
dc.owningcollname | Dissertations and Theses (Ph.D. and Master's) |
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