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

  • theoretical physics
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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.

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The OBELIX Collaboration

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Received: 2 December 2003, Published online: 23 April 2004

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The OBELIX Collaboration. \(\overline pp\) annihilation into four charged pions at rest and in flight. Eur. Phys. J. C 35, 21–33 (2004). https://doi.org/10.1140/epjc/s2004-01811-8

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