Bose-Einstein Correlations in
and 183 GeV
The OPAL Collaboration
G. Abbiendi2 - et al.
2Dipartimento di Fisica dell' Università di Bologna and INFN, I-40126 Bologna, Italy
Received: 28 October 1998 / Published online: 1 March 1999
Bose-Einstein correlations between like-charge pions are studied in hadronic final states produced by annihilations at center-of-mass energies of 172 and 183 GeV. Three event samples are studied, each dominated by one of the processes ,,or . After demonstrating the existence of Bose-Einstein correlations in W decays, an attempt is made to determine Bose-Einstein correlations for pions originating from the same W boson and from different W bosons, as well as for pions from events. The following results are obtained for the individual chaoticity parameters , assuming a common source radius R: