Measurement of ww + wz production cross section and study of the dijet mass spectrum in the lnu + jets final state at CDF

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We present the measurement of the WW and WZ production cross section in p{bar p} collisions at {radical}s = 1.96 TeV, in a final state consisting of an electron or muon, neutrino and jets. The data analyzed were collected by the CDF II detector at the Tevatron collider and correspond to 4.3 fb{sup -1} of integrated luminosity. The analysis uses a fit to the dijet mass distribution to extract the diboson contribution. We observe 1582 {+-} 275(stat.) {+-} 107(syst.) diboson candidate events and measure a cross section of {sigma}{sub WW/WZ} = 18.1 {+-} 3.3(stat.) {+-} 2.5(syst.) pb, consistent with the ... continued below

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173 pages

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Cavaliere, Viviana & U., /Siena December 1, 2010.

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We present the measurement of the WW and WZ production cross section in p{bar p} collisions at {radical}s = 1.96 TeV, in a final state consisting of an electron or muon, neutrino and jets. The data analyzed were collected by the CDF II detector at the Tevatron collider and correspond to 4.3 fb{sup -1} of integrated luminosity. The analysis uses a fit to the dijet mass distribution to extract the diboson contribution. We observe 1582 {+-} 275(stat.) {+-} 107(syst.) diboson candidate events and measure a cross section of {sigma}{sub WW/WZ} = 18.1 {+-} 3.3(stat.) {+-} 2.5(syst.) pb, consistent with the Standard Model prediction of 15.9 {+-} 0.9 pb. The best fit to the dijet mass of the known components shows a good agreement with the data except for the [120, 160] GeV/c{sup 2} mass range, where an excess is observed. We perform detailed checks of our background model and study the significance of the excess, assuming an additional gaussian component with a width compatible with the expected dijet mass resolution. A standard {Delta}{sub {chi}}{sup 2} test of the presence of the additional component, returns a p-value of 4.2 x 10{sup -4} when standard sources of systematics are considered, corresponding to a significance of 3.3{sigma}.

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173 pages

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  • Report No.: FERMILAB-THESIS-2010-51
  • Grant Number: AC02-07CH11359
  • DOI: 10.2172/1007274 | External Link
  • Office of Scientific & Technical Information Report Number: 1007274
  • Archival Resource Key: ark:/67531/metadc830879

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 1, 2010

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  • May 19, 2016, 3:16 p.m.

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  • Aug. 30, 2016, 3:31 p.m.

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Cavaliere, Viviana & U., /Siena. Measurement of ww + wz production cross section and study of the dijet mass spectrum in the lnu + jets final state at CDF, thesis or dissertation, December 1, 2010; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc830879/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.