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+π-π+π- production, and on the analogous reaction αα → ααπ+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).
Original language | English |
---|---|
Pages (from-to) | 154-184 |
Number of pages | 31 |
Journal | Nuclear Physics, Section B |
Volume | 264 |
Issue number | C |
DOIs | |
State | Published - 1986 |
Externally published | Yes |