Measurement of the ratio of inclusive cross sections spp→Z+b-jet spp→Z+jet in the dilepton final states
by Smith, Kenneth James, Ph.D., STATE UNIVERSITY OF NEW YORK AT BUFFALO, 2011, 190 pages; 3440348

Abstract:

The inclusive production of b-jets with a Z boson is an important background to searches for the Higgs boson in associated ZH → llbb¯ production at the Fermilab Tevatron collider. This thesis describes the most precise measurement to date of the ratio of inclusive cross sections σ( pp¯ → Z +b-jet)/σ( pp¯ → Z+jet) when a Z boson decays into two electrons or muons. The measurement uses a data sample from pp¯ collisions at the center of mass energy [special characters omitted] = 1.96 TeV corresponding to an integrated luminosity of 4.2 fb −1 collected by the D0 detector. The measured ratio σ( Z + b-jet)/σ(Z+jet) is 0.0187 ± 0.0021(stat) ± 0.0015(syst) for jets with transverse momentum pT > 20 GeV and pseudorapidity |η| ≤2.5. The measurement is compared with the next-to-leading order theoretical predictions from MCFM and is found to be consistent within uncertainties.

 
AdviserAvto Kharchilava
SchoolSTATE UNIVERSITY OF NEW YORK AT BUFFALO
SourceDAI/B 72-04, p. , Mar 2011
Source TypeDissertation
SubjectsParticle physics
Publication Number3440348
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