1 v 2 5 N ov 2 00 4 Resonances in J / ψ → φπ + π − and φK + K −
نویسندگان
چکیده
A partial wave analysis is presented of J/ψ → φππ and φKK from a sample of 58M J/ψ events in the BES II detector. The f0(980) is observed clearly in both sets of data, and parameters of the Flatté formula are determined accurately:M = 965± 8 (stat) ±6 (syst) MeV/c, g1 = 165± 10± 15 MeV/c, g2/g1 = 4.21± 0.25± 0.21. The φππ data also exhibit a strong ππ peak centred at M = 1335 MeV/c. It may be fitted with f2(1270) and a dominant 0 + signal made from f0(1370) interfering with a smaller f0(1500) component. There is evidence that the f0(1370) signal is resonant, from interference with f2(1270). There is also a state in ππ with M = 1790 −30 MeV/c 2 and Γ = 270 −30 MeV/c ; spin 0 is preferred over spin 2. This state, f0(1790), is distinct from f0(1710). The φKK̄ data contain a strong peak due to f ′ 2(1525). A shoulder on its upper side may be fitted by interference between f0(1500) and f0(1710). PACS: 13.25.Gv, 14.40.Gx, 13.40.Hq
منابع مشابه
ar X iv : h ep - e x / 04 11 04 3 v 1 1 1 N ov 2 00 4 The κ in J / Ψ → K + π − K − π +
A combined fit is presented to BES II data on J/Ψ → K + π − K − π + and LASS data for S-wave Kπ elastic scattering. There is a strong κ peak near the Kπ threshold in J/Ψ → K * (890)κ. It is fitted using a Breit-Wigner amplitude with an s-dependent width containing an Adler zero. It gives a pole position of (760 ± 20(stat)±40(syst))−i(420±45(stat)±60(syst)) MeV. The S-wave scattering length of 0...
متن کاملar X iv : h ep - p h / 99 11 24 6 v 1 4 N ov 1 99 9 1 Theoretical Summary of the HADRON 99 conference
The Constituent Quark Model has provided a remarkable description of the experimentally observed hadron spectrum but still has no firm theoretical basis. Attempts to provide a QCD justification discussed at Hadron99 include QCD Sum Rules, instantons, relativistic potential models and the lattice. Phenomenological analyses to clarify outstanding problems like the nature of the scalar and pseudos...
متن کاملar X iv : h ep - p h / 99 09 20 4 v 3 2 9 Ju n 20 01 Study of N ∗ ( 1440 ) from J / Ψ Decays
For J/Ψ → ¯ ppπ 0 and ¯ ppπ + π − , the π 0 p and pπ + π − systems are limited to be pure isospin 1/2 due to isospin conservation. This is a big advantage in studying N * resonances from J/Ψ decays, compared with πN and γN experiments. The process J/Ψ → ¯ pN * or p ¯ N * provides a new way to probe the internal structure of the N * resonances. Here we report a quark model calculation for J/Ψ → ...
متن کاملar X iv : 0 80 8 . 16 45 v 1 [ he p - ph ] 1 2 A ug 2 00 8 Update analysis of τ − → V P − ν τ : Theory and Experiment
Within the resonance chiral theory (RχT), we have studied the process of a tau lepton decaying into a vector resonance plus a pseudo-Goldstone meson and a tau neutrino. Two kinds of processes are discussed: (a) τ− → (ρπ, ωπ−, φπ,KK)ντ , belonging to ∆S = 0 processes and (b) ∆S = 1 processes, such as τ− → (ρK, ωK−, φK−,K ∗0 π−)ντ . To fit the τ − → ωπ−ντ spectral function and the decay distribut...
متن کاملar X iv : h ep - e x / 04 11 00 1 v 1 2 9 O ct 2 00 4 Resonances in J / ψ → φπ + π − and φK + K −
A partial wave analysis is presented of J/ψ → φππ and φKK from a sample of 58M J/ψ events in the BES II detector. The f0(980) is observed clearly in both sets of data, and parameters of the Flatté formula are determined accurately:M = 965± 8 (stat) ±6 (syst) MeV/c, g1 = 165± 10± 15 MeV/c, g2/g1 = 4.21± 0.25± 0.21. The φππ data also exhibit a strong ππ peak centred at M = 1335 MeV/c. It may be f...
متن کامل