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Elsevier, Physics Letters B, 4(458), p. 517-528, 1999

DOI: 10.1016/s0370-2693(99)00662-0

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Measurement of an elongation of the pion source in Z decays

Journal article published in 1999 by M. Acciarri, P. Achard, O. Adriani, M. Zöller, Xu Zz, M. Aguilar-Benitez, J. Alcaraz, Zhang Zp, G. Alemanni, J. Allaby, A. Aloisio, M. G. Alviggi, G. Ambrosi, H. Anderhub, V. P. Andreev and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

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(-0.19)(+0.03). (C) 1999 Published by Elsevier Science B.V. All rights reserved.