Z boson production in association with heavy quark jets at D0.

摘要

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 sigma( Z + b jet)/sigma(Z + jet), and the first measurements of the ratio of cross sections sigma(Z + c jet) sigma(Z + jet) and sigma( Z + c jet)/sigma(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 sigma(Z + b jet)/sigma(Z + jet) have been measured as a function of jet and Z boson pT, jet eta, and Deltaϕ(Z, jet). The Z + c jet ratios of differential cross sections are measured as a function of jet and Z boson p T..