Bose–Einstein study of position–momentum correlations of charged pions in hadronic Z0 decays

David Charlton, Predrag Jovanovic, PJ Bell, Christopher Hawkes, Peter Watkins, Alan Watson, Nigel Watson, John Wilson, G Abbiendi, The OPAL Collaboration

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17 Citations (Scopus)


A study of Bose-Einstein correlations in pairs of identically charged pions produced in e(+)e(-) annihilations at the Z(0) peak has been performed for the first time assuming a non-static emitting source. The results are based on the high statistics data obtained with the OPAL detector at LEP. The correlation functions have been analyzed in intervals of the average pair transverse momentum and of the pair rapidity, in order to study possible correlations between the pion production points and their momenta (position momentum correlations). The Yano-Koonin and the Bertsch-Pratt parameterizations have been fitted to the measured correlation functions to estimate the geometrical parameters of the source as well as the velocity of the source elements with respect to the overall centre-of-mass frame. The source rapidity is found to scale approximately with the pair rapidity, and both the longitudinal and transverse source dimensions are found to decrease for increasing average pair transverse momenta.
Original languageEnglish
Pages (from-to)787-803
Number of pages17
JournalEuropean Physical Journal C
Issue number4
Early online date19 Oct 2007
Publication statusPublished - 10 Nov 2007


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