Elsevier

Nuclear Physics B

Volume 264, 1986, Pages 154-184
Nuclear Physics B

A search for glueballs and a study of doouble pomeron exchange at the CERN intersecting storage rings

https://doi.org/10.1016/0550-3213(86)90477-3Get rights and content

Abstract

We present results from a study of centrally produced mesons in 3 × 106 events with two small-angle protons at the CERN Intersecting Storage Rings. A high-statistics sample of exclusive pp → ppπ+π events at √s = 63 GeV has been obtained, where the reaction mechanism is dominated by double pomeron exchange. Scalar or tensor glueballs may be produced by this process. The π+π mass spectrum has a distinctive structure, and analysis shows that the data are dominantly S-wave up to 1600 MeV. The behaviour of the D-wave provides evidence for a 2++ resonance (M = 1480 ± 50 MeV, Γ = 150 ± 50 MeV) in addition to the f(1270). We also show data on exclusive K+K, pp, and π+ππ+π production, and on the analogous reaction ααααπ+π at √s = 126 GeV. Flavour independence is suggested by the observation of approximately equal numbers of K+K and π+π pairs for mass above 1 GeV. The mass spectra are also apparently independent of √s (45, 63, 126 GeV) and incident particle type (p, α).

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