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Structure at 2175 MeV in e+e− → ϕf0(980) observed via initial-state radiation
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We study the initial-state-radiation processes e + e − → K + K − π + π − γ and e + e − → K + K − π 0 π 0 γ using an integrated luminosity of 232 fb − 1 collected at the Υ ( 4 S ) mass with the BABAR detector at SLAC. Even though these reactions are dominated by intermediate states with excited kaons, we are able to study for the first time the cross section for e + e − → ϕ ( 1020 ) f 0 ( 980 ) as a function of center-of-mass energy. We observe a structure near threshold consistent with a 1 −− resonance with mass m = 2.175 ± 0.010 ± 0.015 GeV / c 2 and width Γ = 58 ± 16 ± 20 MeV . We observe no Y ( 4260 ) signal and set a limit of B Y → ϕ π + π − ⋅ Γ Y e e < 0.4 eV (90% confidence level), which excludes some models.
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GRAUGÉS POUS, Eugeni and BABAR Collaboration. Structure at 2175 MeV in e+e− → ϕf0(980) observed via initial-state radiation. Physical Review D. 2006. Vol. 74, num. 9, pags. 091103(R). ISSN 1550-7998. [consulted: 24 of May of 2026]. Available at: https://hdl.handle.net/2445/131426