Resonances in J / psi ---> phi pi+ pi- and phi K+ K- - INSPIRE

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Resonances in J / psi ---> phi pi+ pi- and phi K+ K-

BES

Collaboration

•

M. Ablikim
(
- Beijing, Inst. High Energy Phys.
)

Nov, 2004

17 pages

Published in:

Phys.Lett.B 607 (2005) 243-253

e-Print:

hep-ex/0411001 [hep-ex]

DOI:

10.1016/j.physletb.2004.12.041

PDG:

{{\mathit f}_{{{0}}}{(980)}}

Experiments:

BEPC-BES

View in:

ADS Abstract Service

reference search363 citations

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Abstract: (Elsevier)

A partial wave analysis is presented of J / ψ → ϕ π + π − and ϕ K + K − from a sample of 58M J / ψ events in the BES II detector. The f 0 ( 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 2 , g 1 = 165 ± 10 ± 15 MeV / c 2 , g 2 / g 1 = 4.21 ± 0.25 ± 0.21 . The ϕ π π data also exhibit a strong ππ peak centred at M = 1335 MeV / c 2 . It may be fitted with f 2 ( 1270 ) and a dominant 0 + signal made from f 0 ( 1370 ) interfering with a smaller f 0 ( 1500 ) component. There is evidence that the f 0 ( 1370 ) signal is resonant, from interference with f 2 ( 1270 ) . There is also a state in ππ with M = 1790 −30 +40 MeV / c 2 and Γ = 270 −30 +60 MeV / c 2 ; spin 0 is preferred over spin 2. This state, f 0 ( 1790 ) , is distinct from f 0 ( 1710 ) . The ϕ K K ¯ data contain a strong peak due to f 2 ′ ( 1525 ) . A shoulder on its upper side may be fitted by interference between f 0 ( 1500 ) and f 0 ( 1710 ) .

14.40.Gx
13.40.Hq
13.25.Gv
electron positron: colliding beams
electron positron: annihilation
J/psi(3100): electroproduction
J/psi(3100): hadronic decay
Phi(1020)
decay: amplitude analysis
mass spectrum

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