Abstract.
Bose-Einstein Correlations (BEC) of three identical charged pions were studied in \(4 \times 10^6\) hadronic \({\rm Z}^0\) decays recorded with the OPAL detector at LEP. The genuine three-pion correlations, corrected for the Coulomb effect, were separated from the known two-pion correlations by a new subtraction procedure. A significant genuine three-pion BEC enhancement near threshold was observed having an emitter source radius of \(r_3 = 0.580 \pm 0.004 \mbox{ (stat.)} \pm 0.029 \mbox{ (syst.)} \mbox{ fm}\) and a strength of \(\lambda_3 = 0.504 \pm 0.010 \mbox{ (stat.)}\pm 0.041 \mbox{ (syst.)}\). The Coulomb correction was found to increase the \(\lambda_3\) value by \(\sim \)9% and to reduce \(r_3\) by \(\sim \)6%. The measured \(\lambda_3\) corresponds to a value of \(0.707 \pm 0.014 \mbox{ (stat.)} \pm 0.078 \mbox{ (syst.)}\) when one takes into account the three-pion sample purity. A relation between the two-pion and the three-pion source parameters is discussed.
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Received: 7 May 1998 / Published online: 12 August 1998
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The OPAL Collaboration., Ackerstaff et al., K. Bose-Einstein correlations of three charged pions in hadronic Z\(^{\bf 0}\) decays. Eur. Phys. J. C 5, 239–248 (1998). https://doi.org/10.1007/s100529800970
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DOI: https://doi.org/10.1007/s100529800970