Proton-antiproton annihilation and meson spectroscopy with the Crystal Barrel

Claude Amsler

doi:10.1103/RevModPhys.70.1293

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Proton-antiproton annihilation and meson spectroscopy with the Crystal Barrel

Claude Amsler

Physik-Institut der Universität Zürich, CH-8057 Zürich, Switzerland

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Rev. Mod. Phys. 70, 1293 – Published 1 October, 1998

DOI: https://doi.org/10.1103/RevModPhys.70.1293

Abstract

This report reviews the achievements of the Crystal Barrel experiment at the Low-Energy Antiproton Ring (LEAR) at CERN. During seven years of operation Crystal Barrel has collected very large statistical samples in $\bar{p} p$ annihilation, especially at rest and with emphasis on final states with high neutral multiplicity. The measured rates for annihilation into various two-body channels and for electromagnetic processes have been used to test simple models for the annihilation mechanism based on the internal quark structure of hadrons. The production of $φ$ mesons is larger than predicted in several annihilation channels. Important contributions to the spectroscopy of light mesons have been made. The exotic $ρ ̂ (1405)$ meson with quantum numbers $J^{PC} {= 1}^{- +}$ has been observed in its $η π$ decay mode. Two $2^{- +}$ isoscalar mesons $η_{2} (1645)$ and $η_{2} (1870),$ and the $0^{- +}$ isoscalar meson $η (1410)$ have been observed in the $η π π$ decay channel. From three-body annihilations three $0^{+ +}$ mesons, $a_{0} (1450),$ $f_{0} (1370),$ and $f_{0} (1500)$ have been established in various decay modes. One of them, $f_{0} (1500),$ may be identified with the expected ground-state scalar glueball.

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[c1] Abele, A., et al., 1996a, Nucl. Phys. A 609, 562.

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[c4] Abele, A., et al., 1997a, “ρ-ω interference in $\bar{p} p$ annihilation at rest into $π^{+} π^{-} η$ ,” Phys. Lett. B 411, 354.

[c5] Abele, A., et al., 1997b, “Measurement of the ω→ηγ decay branching ratio,” Phys. Lett. B 411, 361.

[c6] Abele, A., et al., 1997c, “Antiproton-proton annihilation at rest into $K_{L} K_{S} π^{0} π^{0}$ ,” Phys. Lett. B 415, 280.

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Proton-antiproton annihilation and meson spectroscopy with the Crystal Barrel

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