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  • Pion correlations and resonance effects in ▫$\bar{p}$▫ p annihilation at rest to ▫$\2pi^+2\pi^-\pi^0$▫
    Apostolakis, A. ...
    We study [pi][pi] correlations in the exclusive reaction [bar]p p [to] 2[pi][sup]+2[pi][sup]-[pi][sup]0 at rest with complete reconstruction of the kinematics for each event. Inclusive and ... differential distributions properly normalizad show an enhancement for small invariant masses M[sub]++,M[sub]-- of like-pion pairs. An even stronger enhancement is seen for the double differential distributions for low pion-pair masses. The signal is strongest when the [pi][sup]0 energy is large and much weaker when this energy is small. Dynamical models with resonances in the final state are confronted with the data. For the kinematic situation where the [rho]3[pi] channel is important the simulation predicts a large pion correlation for the double differential density, qualitatively explaining the observed bahaviour. The stochastic HBT mechanism is not supported by these findings for the exclusiva annihilation reaction studied.
    Source: The European physical journal. C. - ISSN 1434-6044 (vol. 6, 1999, str. 437-450)
    Type of material - article, component part
    Publish date - 1999
    Language - english
    COBISS.SI-ID - 34043