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$\overline pp$ annihilation into four charged pions at rest and in flight

Authors:	The OBELIX Collaboration

Abstract:	The spin-parity analysis of the data on the $\bar{p} p \to 2 \pi^ + 2 \pi^-$ annihilation reaction at rest in liquid and in gaseous hydrogen at 3 bar pressure and in flight at $\overline p$ momentum of $\simeq 50$ MeV/c, collected by the Obelix spectrometer at the LEAR complex of CERN, is presented. The relative branching ratios $(a_1(1260) \to \sigma\pi) /(a_1(1260) \to \rho\pi) = 0.06 \pm 0.05$ and $(\pi(1300) \to \sigma\pi) /(\pi(1300) \to \rho\pi) = 2.2 \pm 0.4$ are obtained. It is also shown that the inclusion of the exotic meson $\pi_1(1400)$ , J^PC = 1^{- +}, mass and width $M = 1.384 \pm 0.028$ , $\Gamma = 0.378 \pm 0.058$ GeV/c², in its decay to $\rho \pi$ , improves the fit and some implications of these results are briefly discussed. The relative S and P-wave annihilation percentages in four charged pions at two target densities are obtained.Received: 2 December 2003, Published online: 23 April 2004

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