Electron-positron annihilation into phi f_{0}(980) and clues for a new 1^{--} resonance

Abstract

We study the e^{+}e^{-} to phi pi pi reaction for pions in an isoscalar s-wave which is dominated by loop mechanisms. For kaon loops we start from the conventional RCHPT, but use the unitarized amplitude for KbarK-pipi scattering and the full kaon form factor instead of the lowest order terms. We study also effects of vector mesons using RCHPT supplemented with the conventional anomalous term for VVP interactions and taking into account the effects of heavy vector mesons in the K*K transition form factor. We find a peak in the dipion invariant mass around the f_{0}(980) as in the experiment. Selecting the phi f_{0}(980) contribution as a function of the e^{+}e^{-} energy we also reproduce the experimental data except for a narrow peak, yielding support to the existence of a 1^{--} resonance above the phi f_{0}(980) threshold, coupling strongly to this state.

arXiv comment18 pages, 4 figures

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• Multichannel calculation of excited vector $\varphi$ resonances and the $\varphi (2170)$
• ϕK^{+}K^{-} production in electron-positron annihilation
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• Vector mesons and electromagnetic form factor of the $\Lambda$ hyperon
• The decay ϕ-> f_0(980) γand the process e^+e^- -> ϕf_0(980)
• QCD sum rule studies on the $ss\bar{s}\bar{s}$ tetraquark states of $J^{PC}=0^{-+}$
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• Is there an isovector companion of the X(2175)?
• Charge asymmetries in e+e- -> pi+ pi- gamma at the phi resonance
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• Photo- and Electron-Production of Mesons on Nucleons and Nuclei