We present a new class of observables which distinguish events containing two or three
hadron jets from those containing a larger number. These observables, which essentially …

Data accumulated by the TASSO detector across the whole range of energies spanned at
PETRA, 12⩽ s⩽ 46.8 GeV, have been analysed in terms of cluster algorithms. Using …

The fraction of hadronic final states from e+ e− annihilation consisting of two jets is
calculated exactly to lowest order in QCD perturbation theory. This improves the Sterman …

Predictions are presented for the distributions of two new e+ e− event shape measures
which involve the summed scalar transverse momentum relative to the thrust axis. The …

We investigate the four-jet production processes e+ e−→ qq gg and e+ e−→ qq qq in lowest
order QCD perturbation theory. We estimate that four-jet events should be detectable at a …

QCD PREDICTIONS FOR JETS IN e+e- ANNIHILATION: ANGULAR CORRELATIONS AND
ASYMMETRIES G. KRAMER and G. SCHIERHOLZ and J. WILLRODT Page 1 Volume 79B …

We calculate the O (α s 2) corrections to the event shape in e+ e− annihilation due to the
parton processes e+ e−→ qq G, e+ e−→ qq qq and e+ e−→ qq GG. The event shape is …

For three-jet events in e+ e− annihilation, a procedure is described to determine all three jet
axes by minimizing the sum of squares of transverse momenta. Computations with this …

We examine the leading double logarithm structure in the calculation of jet fractions using
the JADE algorithm, based on a jet-jet mass cut ys. We find that there is no simple formula …

We present a complete set of rotationally invariant observables (H l) which characterizes the
'shapes' of final states in e+ e− annihilation. They are infrared stable when calculated in …