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Structure at 2175 MeV in e+eϕf0(980) observed via initial-state radiation

B. Aubert et al. (BABAR Collaboration)
Phys. Rev. D 74, 091103(R) – Published 17 November 2006

Abstract

We study the initial-state-radiation processes e+eK+Kπ+πγ and e+eK+Kπ0π0γ using an integrated luminosity of 232fb1 collected at the Υ(4S) 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+eϕ(1020)f0(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±0.015GeV/c2 and width Γ=58±16±20MeV. We observe no Y(4260) signal and set a limit of BYϕπ+π·ΓeeY<0.4eV (90% confidence level), which excludes some models.

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  • Received 10 October 2006

DOI:https://doi.org/10.1103/PhysRevD.74.091103

©2006 American Physical Society

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Vol. 74, Iss. 9 — 1 November 2006

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