Dear All,

Yesteraday, I posted CDF NOTE 6878 from cdfsga.
But my disk quota on cdfsga seems to be over to put my ps-file.

I post it again. Actual ps-file size is 25 M bytes (209 pages).
I'm sorry to trouble you.

With the best regards,
Soushi Tsuno


Thesis title :

   Tests of Enhanced Leading Order QCD in W Boson plus Jet Production 
              in 1.96-TeV Proton-Antiproton Collisions

Author : Soushi Tsuno    Univ. of Tsukuba


This thesis was submitted to 

A dissertation submitted to the Doctoral Program
in Physics, the University of Tsukuba
in partial fulfillment of the requirements
for the degree of Doctor of Philosophy in Science

Abstract

We have studied the W + $\geq$ n jets process in Tevatron Run II experiment. 
The data used correspond to a total integrated luminosity of 72 pb$^{-1}$ 
taken from March 2002 through January 2003. The lowest order QCD predictions 
have been tested with a new prescription of the parton-jet matching, which 
allows to construct the enhanced LO phase space. According to this procedure, 
one gets unique results which do not depend on unphysical bias of kinematical 
cuts to avoide the collinear/infrared divergence in calculation. Namely, one 
can get the meaningful results in the lowest order prediction. The 
controllable event samples of the W boson plus jets events by the enhanced 
lowest order prediction will lead smaller systematic uncertainty than the 
naive prediction without any cares of the collinear/infrared divergence. We 
expect our method will be also useful to make systematically small samples as 
the background estimates in the top quark analysis.

We found a good agreement between data and theory in typical kinematics 
distributions. The number of events for each inclusive sample up to 3 jets are 
compared with Monte Carlo calculations. A comparison with Run I results is 
also presented. This is the first result for the CDF Run II experiment. 



Posted to /cdf/pub/thesis/cdf6878_wjets_phd2.ps
    http://www-cdf.fnal.gov/thesis/cdf6878_wjets_phd2.ps
(This is revision # 2.)

Posted by tsuno@cdfsga