Bose-Einstein Correlations in \(\rm e^+e^-\rightarrow W^+W^-\) at 172 and 183 GeV

  • The OPAL Collaboration
  • G. Abbiendi et al.
Experimental physics


Bose-Einstein correlations between like-charge pions are studied in hadronic final states produced by \(\mathrme^+\mathrme^-\) annihilations at center-of-mass energies of 172 and 183 GeV. Three event samples are studied, each dominated by one of the processes \(\mathrm{W}^+\mathrm{W}^-\rightarrow\mathrm{q\overline{q}}\ell\overline{\nu}_{\ell}\), \(\mathrm{W}^+\mathrm{W}^-\rightarrow\mathrm{q\overline{q}}\mathrm{q\overline{q}}\), or \((\mathrm{Z}^0/\gamma)^{*}\rightarrow\mathrm{q\overline{q}}\). 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 \((\mathrm{Z}^0/\gamma)^{*}\rightarrow\mathrm{q\overline{q}}\) events. The following results are obtained for the individual chaoticity parameters \(\lambda\), assuming a common source radius R: \(\) In each case, the first error is statistical and the second is systematic. At the current level of statistical precision it is not established whether Bose-Einstein correlations, between pions from different W bosons exist or not.


Current Level Common Source Event Sample Statistical Precision Source Radius 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • The OPAL Collaboration
  • G. Abbiendi et al.
    • 1
  1. 1. Dipartimento di Fisica dell' Università di Bologna and INFN, I-40126 Bologna, Italy IT

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