Ph.D Thesis:

Calorimetric Measurements in CDF: A New Algorithm to Improve 
The Energy Resolution of Hadronic Jets

Giuseppe Latino
University of Cassino




Abstract

Many interesting physics signatures in a collider experiment like CDF are
characterized by final state quarks and gluons which fragment into 
hadronic jets. An improvement in the jet energy resolution is then very
important for many Run II physics analyses and any effort in pursuing such
result can be rightly considered as part of the complex CDF II upgrade
program.
The jet energy resolution comes from many sources, which can be grouped
into two categories: detector and physics effects. In the work exposed in
this thesis, detector effects were extensively treated developing a new
algorithm which allows to optimize the jet energy resolution using
calorimetry as well as additional detector information. For the first time
in a hadron collider the full granularity of the detector was adopted to
perform corrections at ``tower level'' rather than at the usual ``jet level'', 
this allowing the new algorithm to be exploited regardless of the clustering 
algorithm chosen to reconstruct the jet.
In the present work the new algorithm has been optimized and implemented
in an offline code which in principle allows it to be applied on each data
sample. A preliminary study on potential algorithm improvements was also 
performed. The algorithm test, as performed on two different Run Ib data
samples, gamma-jet and di-jet, showed very promising results up to ~25% of
improvement with respect to the standard CDF jet corrections.



Posted to /cdf/pub/thesis/cdf5555_latino_thesis.ps
    http://www-cdf.fnal.gov/thesis/cdf5555_latino_thesis.ps

Posted by latino@cdfsga