Antiproton-proton annihilation into (K + 3π) and (K + 4π) at 1.2 GeV/c study of the DO properties

Antiproton proton annihilations at 1.6–2.2 GeV/c into final states with a K1o meson

“…Our results, and those obtained in other experiments [6][7][8][9], are shown in table 14. The resonance fractions in the other experiments were determined in exactly the same way as for the K-+K~Tr~Tr+TT final state.…”

“…12). There is marginal evidence for p production, some K* -+ Kn ~ but no K* -+ KTr °, some D ~ K-*K~Tr ~, and a low mass KK enhancement most of which is associated with the D. Estimates of co, p, K*, and D percentages for the four central momenta are listed in table 15, together with results of other experiments [6][7][8][9] (where the methods used were the same as in the five-body final states). Table 15 shows a roughly constant K* fraction, but the co and D fractions decrease with increasing momentum.…”

“…In table 13 our results are compared with experiments at other momenta [6][7][8][9]. Tl,e resonance fractions at 1.2 GeV/c come from a simultaneous fit to all two-and three-body mass spectra, without allowance for associated production (except DO); those at the higher momenta come from simple fits to the mass spectra using only unambiguous events.…”

“…This same final state at 1.1--1.2 GeV/c showed 18 -+ 5% D production [6], three times the percentage in the K-*K~rr~rr+rr -events at that momentum, and ~ 6 + lfJ. F 1 production [15].…”

The $K^- p \to f_1(1285) Λ$ reaction within an effective Lagrangian approach

“…The f 1 (1285) meson was discovered in the 1960s [1][2][3][4] as a bump in the πK K mass distribution in pp annihilations and in the reaction of π − p → nπK K. Its quantum numbers have been quite well established, thus, it is now an axial-vector state with [I G (J P C ) = 0 + (1 ++ )] and mass M f1 = 1281.9 ± 0.5 MeV and total decay width Γ f1 = 24.2 ± 1.1 MeV [5]. Within quark models, it is described as a q q state, while the recent studies of Refs.…”