Photoproduction of the f1(1285) meson

CLAS Collaboration

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30 Scopus citations


The f1(1285) meson with mass 1281.0±0.8 MeV/c2 and width 18.4±1.4 MeV (full width at half maximum) was measured for the first time in photoproduction from a proton target using CLAS at Jefferson Lab. Differential cross sections were obtained via the ηπ+π-,K+K̄0π-, and K-K0π+ decay channels from threshold up to a center-of-mass energy of 2.8 GeV. The mass, width, and an amplitude analysis of the ηπ+π- final-state Dalitz distribution are consistent with the axial-vector JP=1+ f1(1285) identity, rather than the pseudoscalar 0- η(1295). The production mechanism is more consistent with s-channel decay of a high-mass N∗ state and not with t-channel meson exchange. Decays to ηππ go dominantly via the intermediate a0±(980)π states, with the branching ratio Γ[a0π(noK̄K)]/Γ[ηππ(all)]=0.74±0.09. The branching ratios Γ(KK̄π)/Γ(ηππ)=0.216±0.033 and Γ(γρ0)/Γ(ηππ)=0.047±0.018 were also obtained. The first is in agreement with previous data for the f1(1285), while the latter is lower than the world average.

Original languageEnglish (US)
Article number065202
JournalPhysical Review C
Issue number6
StatePublished - Jun 9 2016

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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