Pion correlations and resonance effects in $\mathrm{\bar{p}p}$ annihilation to $4\pi^0$ at rest

O. Kortner; M.P. Locher; V.E. Markushin; P. Weber; O. Wigger

doi:doi:10.1007/s10052-002-1033-8

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2023 Impact factor 4.2

Particles and Fields

Eur. Phys. J. C 25, 353-360 (2002)
DOI: 10.1007/s10052-002-01033-8

Pion correlations and resonance effects in $\mathrm{\bar{p}p}$ annihilation to $4\pi^0$ at rest

O. Kortner¹, M.P. Locher^{2, 3}, V.E. Markushin², P. Weber⁴ and O. Wigger^{2, 3}

¹ Ludwig-Maximilians-Universität, 80799 München, Germany
² Paul Scherrer Institut (PSI), 5232 Villigen, Switzerland
³ University of Zürich, 8006 Zürich, Switzerland
⁴ ETH-IPP Zürich, 8093 Zürich, Switzerland

(Received: 26 February 2002 / Revised version: 22 July 2002 / Published online: 30 August 2002 )

Abstract
We study $\pi^0\pi^0$ correlations in the exclusive reaction $\mbox{$\mathrm{\bar{p}p}$ }\to4\pi^0$ at rest with complete reconstruction of the kinematics for each event. The inclusive distribution is fairly flat at small invariant mass of the pion pair while a small enhancement in the double differential distribution is observed for small invariant masses of both pion pairs. Dynamical models with resonances in the final state are shown to be consistent with the data while the stochastic HBT mechanism is not supported by the present findings.