Article révisé par les pairs
Résumé : A strong increase of the mean transverse momentum 〈pt〉 with the number of charged particles nch is observed in e+e- annihilations into hadrons at LEP energies. The effect resembles correlations observed in hadron-hadron interactions. In e+e- annihilations the 〈pt〉 and nch correlations can be accounted for by gluon radiation.