Bose-Einstein correlations in e+e- → W+W- at 172 and 183 GeV

The OPAL Collaboration

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20 Scopus citations


Bose-Einstein correlations between like-charge pions are studied in hadronic final states produced by e+e- annihilations at center-of-mass energies of 172 and 183 GeV. Three event samples are studied, each dominated by one of the processes W+W- →qq̄ℓν̄e, W+W- qq̄qq̄, or (Z0/γ)* → qq̄. 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 (Z0/γ)* → qq̄ events. The following results are obtained for the individual chaoticity parameters λ, assuming a common source radius R: λsame= 0.63 ± 0.19 ± 0.14 λdiff = 0.22 ± 0.53 ±0.14, λ Z* = 0.47 ± 0.11 ± 0.08, R = 0.92 ± 0.09 ± 0.09 fm. 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.

Original languageEnglish
Pages (from-to)559-571
Number of pages13
JournalEuropean Physical Journal C
Issue number4
StatePublished - 1 Jan 1999
Externally publishedYes

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)


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