Measurement of an elongation of the pion source in $Z$ decays

We measure Bose-Einstein correlations between like-sign charged pion pairs in hadronic Z decays with the l3 detector at lep . The analysis is performed in three dimensions in the longitudinal center-of-mass system. The pion source is found to be elongated along the thrust axis with a ratio of transverse to longitudinal radius of 0.81±0.02 +0.03 −0.19 .

electron positron: colliding beams
electron positron: annihilation
Z0: electroproduction
Z0: hadronic decay
pi: multiple production
correlation: two-pion
boson: statistics
pi: particle source
L3
experimental results

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Measurement of an elongation of the pion source in ZZZ decays

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Measurement of an elongation of the pion source in $Z$ decays