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| Total Pages | : 9 |
| Release | : 2015 |
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| Author | : Yildirim Doğan Mutaf |
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| Total Pages | : 456 |
| Release | : 2005 |
| Genre | : Electroweak interactions |
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| Release | : 2010 |
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The ratio of the cross section for p{bar p} interactions producing a Z boson and at least one b quark jet to the inclusive Z+jet cross section is measured using 4.2 fb−1 of p{bar p} collisions collected with the D0 detector at the Fermilab Tevatron collider at √s = 1.96 TeV. The Z → l+l− candidate events with at least one b jet are discriminated from Z+ charm and light jet(s) events by a novel technique that exploits the properties of the tracks associated to the jet. The measured ratio is 0.0193 ± 0.0027 for events having a jet with transverse momentum p{sub T} > 20 GeV and pseudorapidity.
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| Release | : 2006 |
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Abstract Not Provided.
| Author | : Kenneth James Smith |
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| Total Pages | : 165 |
| Release | : 2011 |
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The inclusive production of $b$-jets with a $Z$ boson is an important background to searches for the Higgs boson in associated $ZH \rightarrow llb\bar{b}$ production at the Fermilab Tevatroncollider. This thesis describes the most precise measurement to date of the ratio of inclusive cross sections $\sigma(p\bar{p} \rightarrow Z+b$-jet$)/\sigma(p\bar{p} \rightarrow Z+$jet$)$ when a $Z$ boson decays into two electrons or muons. The measurement uses a data sample from $p\bar{p}$ collisions at the center of mass energy $\sqrt{s}=1.96$ TeV corresponding to an integrated luminosity of 4.2 fb$^{-1}$ collected by the D0 detector. The measured ratio $\sigma(Z+b$-jet$)/\sigma(Z+$jet$)$ is $0.0187\pm0.0021(stat.) \pm0.0015(syst)$ for jets with transverse momentum $p_T$~$>$~20 GeV and pseudorapidity $\eta\leq$2.5. The measurement is compared with the next-to-leading order theoretical predictions from MCFM and is found to be consistent within uncertainties.
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| Total Pages | : 8 |
| Release | : 2013 |
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| Total Pages | : 190 |
| Release | : 2010 |
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The inclusive production of b-jets with a Z boson is an important background to searches for the Higgs boson in associated ZH → llb$ar{b}$ production at the Fermilab Tevatron collider. This thesis describes the most precise measurement to date of the ratio of inclusive cross sections ?(p$ar{p}$ → Z + b-jet)/?(p$ar{p}$ → Z + jet) when a Z boson decays into two electrons or muons. The measurement uses a data sample from p$ar{p}$ collisions at the center of mass energy √s = 1.96 TeV corresponding to an integrated luminosity of 4.2 fb-1 collected by the D0 detector. The measured ratio ?(Z + b-jet)/?(Z + jet) is 0.0187 ± 0.0021(stat) ± 0.0015(syst) for jets with transverse momentum pT > 20 GeV and pseudorapidity.
| Author | : John Krane |
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| Total Pages | : 436 |
| Release | : 1998 |
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| Author | : Oriol Saltó Bauzà |
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| Total Pages | : 134 |
| Release | : 2008 |
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| ISBN | : 9788469166437 |
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| Release | : 2011 |
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A measurement of inclusive W and Z production cross sections in pp collisions at sqrt(s)=7 TeV is presented. The electron and muon decay channels are analyzed in a data sample collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 36 inverse picobarns. The measured inclusive cross sections are sigma(pp-> WX) B(W-> l nu) = 10.30 +/- 0.02 (stat.) +/- 0.10 (syst.) +/- 0.10 (th.) +/- 0.41 (lumi.) nb and sigma(pp -> ZX) B(Z-> l+̂l-̂) = 0.974 +/- 0.007 (stat.) +/- 0.007 (syst.) +/- 0.018 (th.) +/- 0.039 (lumi.) nb, limited to the dilepton invariant mass range 60 to 120 GeV. The luminosity-independent cross section ratios are [sigma(pp->WX) B(W-> l nu)]/[sigma(pp-> ZX) B(Z->l+̂l-̂)] = 10.54 +/- 0.07 (stat.) +/- 0.08 (syst.) +/- 0.16 (th.) and [sigma(pp->W+̂X) B(W+̂ -> l+̂nu)] / [sigma(pp->W-̂ X) B(W-̂ -> l-̂ nu)] = 1.421 +/- 0.006 (stat.) +/- 0.014 (syst.) +/- 0.029 (th.). The measured values agree with next-to-next-to-leading order QCD cross section calculations based on recent parton distribution functions.
