Observation of a 2++ resonance at 1515-MeV in proton anti-proton annihilations into 3 pi0

Antiproton-proton annihilations at rest into 3 π 0 are analyzed in terms of π 0 π 0 final state interactions. A J PC = 2 + + resonance at a mass of 1515 ± 10 MeV with a width of 120 ± 10 MeV is required to explain the data. This result is supported by previous observations made on the ππ system in p p and p n annihilations which show that the resonance has I = 0. This resonance is practically degenerate in mass with the f′ 2 (1525) but the two resonances have very different production and decay characteristics.

anti-p p: annihilation
annihilation: anti-p p
tensor meson: hadroproduction
hadroproduction: tensor meson
tensor meson: (1515)
tensor meson: mass
mass: tensor meson
tensor meson: width
tensor meson: decay
decay: tensor meson

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