MEASUREMENT OF THE W + >=1 JET CROSS SECTION
                       IN PROTON-ANTIPROTON COLLISIONS
                              AT SQRT(S)=1.8 TeV


We present a measurement of sigma(W + >=1 jet), the cross section for W + >=1
jet production, using W -> enu events from 108 pb^-1 of proton-antiproton
collisions at a center of mass energy of 1.8 TeV.  The data were collected
using the Collider Detector at Fermilab (CDF) at the Fermilab Tevatron from
1992-1995 (Run 1).  The experimental measurement of sigma(W + >=1 jet) is
compared to next-to-leading-order QCD predictions generated using the DYRAD
Monte Carlo program.  We explore the sensitivity of sigma(W + >=1 jet) to
differences in the jet definition by using two different jet cone sizes (R =
0.4 and R = 0.7) and by varying the jet transverse energy threshold (E_T min)
from 15 to 95 GeV.  For 0.4 jet cones, the predictions of sigma(W + >=1 jet)
agree well with the data, lying within one standard deviation of the measured
values for E_T min > 25 GeV.  For 0.7 cones, the theoretical predictions
reproduce the data at low E_T min, but underestimate the data by about one
standard deviation for E_T min > 35 GeV.  Generally, data and theory agree to
within 20% for both cone sizes over the entire range of E_T min.



Posted to /cdf/pub/thesis/cdf5512_dittmann_thesis.ps
    http://www-cdf.fnal.gov/thesis/cdf5512_dittmann_thesis.ps

Posted by dittmann@cdfsga