Meson Resonances in Proton-Antiproton Annihilation

Abstract

Crystal Barrel data for proton-antiproton annihilation in flight at 900 MeV/c are presented. The channels pp → 3π 0 , π 0 π 0 η and π 0 ηη are used to search for isoscalar 0 ++ and 2 ++ mesons in the mass range 1500 − 2000 MeV. Both 3π 0 and π 0 ηη data sets require an isoscalar 2 ++ resonance decaying into π 0 π 0 and ηη with mass M = (1867 ± 46) MeV and width Γ = (385 ± 58) MeV. The analysis of π 0 π 0 η leads to an isovector 2 ++ state decaying into π 0 η with mass M = (1698 ± 44) MeV and width Γ = (265 ± 55) MeV. The 3π 0 and π 0 ηη data do not show any f 0 (1710). This adds supportive evidence that this meson is mainly ss.

Internal dispute resolution systems: Do high promises come with higher expectations?

“…56 Habscheid (2014) There is no legislative structure, no freedom of information or right-to-know statue, for public access to information about the outcomes of privately-designed dispute resolution systems. 64 Traditionally, one of the main reasons for choosing alternative dispute resolution, especially arbitration, is precisely its private nature.…”