  The Run II jet physics group includes the Jet Algorithms, Jet Shape/Energy
Flow, and Jet Measurements/Correlations subgroups. The main goal of the jet
algorithm subgroup was to explore and define standard Run II jet finding
procedures for CDF and DO. The focus of the jet shape/energy flow group was the
study of jets as objects and the energy flows around these objects. The jet
measurements/correlations subgroup discussed measurements at different beam
energies; strong coupling constant measurements; and LO, NLO, NNLO, and
threshold jet calculations. As a practical matter the algorithm and
shape/energy flow groups merged to concentrate on the development of Run II jet
algorithms that are both free of theoretical and experimental difficulties and
able to reproduce Run I measurements.
  Starting from a review of the experience gained during Run I, the group
considered a variety of cone algorithms and KT algorithms. The current
understanding of both types of algorithms, including calibration issues, are
discussed in this report along with some preliminary experimental results. The
jet algorithms group recommends that CDF and DO employ the same version of both
a cone algorithm and a KT algorithm during Run II. Proposed versions of each
type of algorithm are discussed. The group also recommends the use of full
4-vector kinematic variables whenever possible. The recommended algorithms
attempt to minimize the impact of seeds in the case of the cone algorithm and
preclustering in the case of the KT algorithm. Issues regarding precluster
definitions and merge/split criteria require further study.
