Bose-Einstein correlations of three charged pions
The OPAL Collaboration
K.Ackerstaff - et al.
8 CERN, European Organisation for Particle Physics, CH-1211 Geneva 23, Switzerland
Received: 7 May 1998 / Published online: 12 August 1998
Bose-Einstein Correlations (BEC) of three identical charged pions were studied in hadronic 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 and a strength of . The Coulomb correction was found to increase the value by and to reduce r3 by . The measured corresponds to a value of when one takes into account the three-pion sample purity. A relation between the two-pion and the three-pion source parameters is discussed.