Measurement of the W+- + b anti-b cross-section in 695-pb-1 of p anti-p collisions at CDF II.

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W{sup {+-}} + b{bar b} events contain the associated production of a W{sup {+-}} boson, a pair of bottom quarks (b{bar b}), 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 b-jet cross-section in W{sup {+-}} + b{bar b} events containing 1 or 2 jets in 695 pb{sup -1} of {radical}s =1.96 TeV p{bar p} collisions at the CDF experiment. This is ... continued below

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142 pages

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Soderberg, Mitchell Paul September 1, 2006.

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W{sup {+-}} + b{bar b} events contain the associated production of a W{sup {+-}} boson, a pair of bottom quarks (b{bar b}), 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 b-jet cross-section in W{sup {+-}} + b{bar b} events containing 1 or 2 jets in 695 pb{sup -1} of {radical}s =1.96 TeV p{bar p} collisions at the CDF experiment. This is the first measurement of the cross-section of W{sup {+-}} b{bar b} performed in any experiment. The cross-section is defined to be proportional to the number of b-jets from W{sup {+-}} b{bar b} events with one or two jets, and a leptonically decaying W{sup {+-}} with decay products passing kinematics cuts (p{sub T}({ell}{sup {+-}}) {ge} 20.0 GeV, |{eta}({ell}{sup {+-}})| {le} 1.1, p{sub T}({nu}) {ge} 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 b-decays. Background b-jet sources are subtracted to isolate the contribution of W{sup {+-}} b{bar b} 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.

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142 pages

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  • Report No.: FERMILAB-THESIS-2006-59
  • Grant Number: AC02-07CH11359
  • DOI: 10.2172/923523 | External Link
  • Office of Scientific & Technical Information Report Number: 923523
  • Archival Resource Key: ark:/67531/metadc900076

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  • September 1, 2006

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  • Sept. 27, 2016, 1:39 a.m.

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  • Sept. 26, 2017, 7:17 p.m.

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Soderberg, Mitchell Paul. Measurement of the W+- + b anti-b cross-section in 695-pb-1 of p anti-p collisions at CDF II., thesis or dissertation, September 1, 2006; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc900076/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.