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

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

Abstract.

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.

Keywords

Current Level Common Source Event Sample Statistical Precision Source Radius 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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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