Measurement of $W^{\pm}\to e^{\pm} \nu$ + Inclusive n-jet Cross Sections with CDF Data at Tevatron Run II

Andrea Messina, messina@fnal.gov
University of Rome ``La Sapienza'' & INFN, Rome, Italy

Abstract:

A study of multi-jet production in the reaction $p\bar{p}\to(W\to e\nu)$ at $\sqrt {s}=1.96$ TeV is presented. The data sample, collected with the CDF Run II detector at the Fermilab collider, corresponds to an integrated luminosity of 127 pb$^{-1}$. From this event sample, the W + n Jets cross sections and their ratios have been measured as a function of the inclusive jet multiplicity. The cross sections and the jet properties are compared with the leading-order QCD prediction from the matrix-element Alpgen Monte Carlo program interfaced with the parton-shower model provided by the Herwig Monte Carlo program. The sensitivity of the theoretical model on the renormalization scale has been explored. The results obtained in this analysis are also compared with the previous CDF Run I measurement taken at $\sqrt {s}=1.8$ TeV.