Abstract
In events of the type e + e − → t t → bW + bW − , particle production could depend in a non-trivial way on the kinematics of the process. Energetic perturbative gluon radiation can be generated (when kinematically allowed) by the original t t system and by the t → bW + and t → bW − decays, with negligible interference between the production and decay between the t and t decays. Soft perturbative gluon emission and non-perturbative fragmentation does introduce a correlation, however. To illustrate the size of these effects, we study the multiplicity as a function of the angle between the b and b jets, close to the t t threshold. Also potential uncertainties in top mass determinations are briefly addressed.
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