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

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## 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## Preview

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