Partial wave analysis of pbar-p to Lambdabar-Lambda

Abstract

A partial wave analysis of PS185 data for pbar-p to Lambda-bar Lambda is presented. A 3S1 cusp is identified in the inverse process Lambda-bar Lambda to pbar-p at threshold using detailed balance. Partial wave amplitudes for pbar-p 3P0, 3F3, 3D3 and 3G3 exhibit a behaviour very similar to resonances observed in Crystal Barrel data. With this identification, the pbar-p to Lambda-bar Lambda data then provide evidence for a new I = 0, J^{PC} = 1^{--} resonance with mass M = 2290 +- 20 MeV, Gamma = 275 +- 35 MeV, coupling to both 3S1 and 3D1.

27 pages, 13 figures. To be published in Euro. Phys. C

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• Spectrum and decays of kaonic hydrogen
• Cusps in K --> 3 pi decays
• Radiative corrections in K --> 3 pi decays
• Cusps in K_L --> 3 pi decays
• Dispersive $\pi K\to \pi K$ and $\pi \pi \to K\bar{K}$ amplitudes from scattering data, threshold parameters and the lightest strange resonance $\kappa$ or $K_0^{\ast }(700)$
• The expansion by regions in pi K scattering
• Hadronic Atoms
• Isospin odd pi K scattering length
• Measurement of the $\pi K$ atom lifetime and the $\pi K$ scattering length
• The ${\pi }^0-\eta -{\eta }^{\prime }$ mixing in a generalized multi-quark interaction scheme
• Isospin-Breaking quark condensates in Chiral Perturbation Theory
• Energy and decay width of the pi-K atom
• Kaonic atoms in QCD
• Bound Deuteron-Antideuteron System (Deuteronium): Leading Radiative and Internal-Structure Corrections to Bound-State Energies
• Relativistic and Recoil Corrections to Light-Fermion Vacuum Polarization for Bound Systems of Spin-0, Spin-1/2, and Spin-1 Particles