Bose-Einstein correlations in $e^+e^- \to W^+W^-$ at 172-GeV and 183-GeV

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- to qqlnu, W+W- to qqqq, or (Z/g)* to qq. 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 (Z/g)* to qq events. The following results are obtained for the individual chaoticity parameters lambda assuming a common source radius R: lambda_same = 0.63 +- 0.19 +- 0.14, lambda_diff = 0.22 +- 0.53 +- 0.14, lambda_Z = 0.47 +- 0.11 +- 0.08, R = 0.92 +- 0.09 +- 0.09. 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.

electron positron: colliding beams
electron positron: annihilation
W: pair production
W: hadronic decay
W: leptonic decay
hadron: multiple production
correlation: two-pion
boson: statistics
model: production
chaos: parametrization

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Bose-Einstein correlations in e+e−→W+W−e^+e^- \to W^+W^-e+e−→W+W− at 172-GeV and 183-GeV

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Bose-Einstein correlations in $e^+e^- \to W^+W^-$ at 172-GeV and 183-GeV