The Z + Jets Analysis

The Z+>= n jet cross sections and jet production properties have been measured for n=1 to 4. The data consist of 6708 Z-e+e- decays from 106 pb**-1 of integrated luminosity (Run 1a+1b).

  • The Z+jets Paper submitted to PRL ( postscript file )

    Blessed Plots

  • Leading jet rapidity in Z+ >=1 jet events, compared to leading-order QCD predictions. The Monte Carlo is normalized to the data, and the data errors are statistical only.

  • Invariant mass of the two leading jets in Z+ >=2 jet events. The Monte Carlo is normalized to the data, and the data errors are statistical only.

  • Invariant mass of the Z + leading jet for Z+ >=1 jet events, and the Z + two leading jets for Z+ >=2 jet events. The Monte Carlo is normalized to the data, and the data errors are statistical only.

  • The Sum Et distributions for Z+ >=1 and Z+ >=2 jet events. We define Sum Et to include only the transverse energies of jets and the electrons from Z boson decay. The Monte Carlo is normalized to the data, and the data errors are statistical only.

    The following plots are extracted from the PRL.

  • Separation between the two leading jets in Z+ >=2 jet events. The Monte Carlo is normalized to the data, and the data errors are statistical only.

  • Transverse energy of the (a) first, (b) second, and (c) third highest Et jets in >=1,>=2, and >=3 jet events, respectively. The points are the data with statistical errors only, and the solid histograms are the QCD predictions (normalized to the data) as described in the test.

  • Cross section for Z+>=n jets versus n, where Z-> e+e-. The QCD prediction band is determined by using two different renormalization scales. The solid line is an exponential fit to the measured cross sections.

  • The cos(theta*) distribution of the Z in >=1 jet events. The angle theta* is the angle of the Z measured with respect to the average beam direction in the Z+leading jet center-of-mass frame. The Monte Carlo predictions are normalized to the data, and the data errors are statistical only.

    Last update 08-Aug-1996

    cdf_tuesday@dukhep.phy.duke.edu