D. Frame

A study of the reaction π−p → φφn AT 16 GeV/c

Abstract The reaction π − p → φφ n has been isolated at 16 GeV/ c and its cross section determined to be 40 ± 10 nb. The φφ mass spectrum shows a threshold enhancement between 2.1 and 2.5 GeV. A successful description of the angular content of the φφ system requires two interferingss J P = 2 + states.

A partial-wave analysis of the (K+K−π−) system produced in π−p → K+K−π−p at 16 GeV/c

The reaction π−p → K+K− π− p at 16 GeV/c was studied in the CERN OMEGA spectrometer and a partial-wave analysis (PWA) of the low-mass (K+K−π−) system (1.3–2.0 GeV) was performed. Only states in the unnatural spin-parity series produced by natural parity exchange are important and they approximately conserve t-channel helicity. The 1+S K∗K wave dominates the low-mass (K+K−π−) region. We observe an enhancement in 2−P K∗K wave at a mass of 1.7 GeV, consistent with the decay of the A3 resonance.

A spin-parity analysis of the φK+ system produced in the reaction K+p → φK+p, φ → K+K− at 13 GeV / c

Abstract The reaction K+p → φK+p at 13 GeV / c has been studied using the CERN Omega spectrometer. The φK+ mass spectrum shows a strong threshold enhancement between 1.5 and 2.0 GeV /c2. A spin-parity analysis of the φK+ system has been performed using a double-moments technique. The 1+ spin-parity state is dominant, peaking in the region 1.6 to 1.7 GeV / c2. A small but significant signal in the 2− wave peaks at a mass of 1.8 GeV / c2 with the characteristics of a resonant state.

Characteristics of the process K+p→K+ppp at 12 GeV/c

Abstract Data are presented on the reaction K + p → K + p pp at 12 GeV/c from an experiment using the OMEGA spectrometer at CERN. A clear Γ (1520) signal is observed in the process K + p → Γ (1520) pp and angular distributions and correlations are presented for this process. The angular distributions for the reaction in which Γ (1520) is not produced show an appreciable backward K+ peak.