Observation of a tensor glueball in the reactions p\bar p \to \pi \pi ,\eta \eta ,\eta \eta ' |
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Authors: | V V Anisovich A V Sarantsev |
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Institution: | 1. St. Petersburg Nuclear Physics Institute, Russian Academy of Sciences, Gatchina, 188300, Russia
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Abstract: | Partial wave analysis of the reactions $p\bar p \to \pi \pi ,\eta \eta ,\eta \eta '$ in the region of invariant masses 1900–2400 MeV indicates the existence of four relatively narrow tensor-isoscalar resonances ? 2(1920), ? 2(2020), ? 2(2240), ? 2(2300), as well as the broad state ? 2(2000). The determined decay couplings of the broad resonance ? 2(2000) → π0π0, ηη, ηη′ satisfy the relations appropriate to those of a tensor glueball, while the couplings of other tensor states do not, thus verifying the glueball nature of ? 2(2000). |
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