Z boson production in association with heavy quark jets at D0
Zennamo, Joseph Anthony, III
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The dominant background in searches for a Higgs boson decaying into b -quarks at the Tevatron is production of a Z boson in association with either b- or c -quark initiated jets ( b or c jets). This thesis describes the first measurements of the ratio of differential cross sections σ( Z + b jet)/σ( Z + jet), and the first measurements of the ratio of cross sections σ( Z + c jet) σ( Z + jet) and σ( Z + c jet)/σ( Z + b jet). These measurements are performed using the full D0 Run II data set corresponding to an integrated luminosity of 9.7 fb -1 . The ratio of differential cross sections σ( Z + b jet)/σ( Z + jet) have been measured as a function of jet and Z boson p T , jet η, and Δ[varphi]( Z, jet). The Z + c jet ratios of differential cross sections are measured as a function of jet and Z boson p T .