A Structure at 2175 MeV in $e^+ e^- \to φf_0(980)$ Observed via Initial-State Radiation

Details A Structure at 2175 MeV in $e^+ e^- \to φf_0(980)$ Observed via Initial-State Radiation A Structure at 2175 MeV in $e^+ e^- \to φf_0(980)$ Observed via Initial-State Radiation

2006-10-07

arxiv.org/abs/hep-ex/0610018v1

Phys.Rev.D74:091103,2006

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages, 11 postscript figues, submitted to PRD-RC

Scientific paper

10.1103/PhysRevD.74.091103

We study the initial-state-radiation processes $e^+ e^- \to K^+ K^-\pi^+\pi^-\gamma$ and $e^+ e^- \to K^+ K^-\pi^0\pi^0\gamma$ using an integrated luminosity of 232 fb$^{-1}$ collected at the $\Upsilon(4S)$ 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 $e^+ e^- \to \phi(1020) f_{0}(980)$ as a function of center-of-mass energy. We observe a structure near threshold consistent with a $1^{--}$ resonance with mass $m = 2.175 \pm 0.010\pm 0.015 GeV/c^2$ and width $\Gamma = 58\pm 16\pm 20 MeV$. We observe no Y(4260) signal and set a limit of $BR_{Y\to\phi\pi^+\pi^-}\cdot\Gamma^{Y}_{ee}<0.4$ eV (90% confidence level), which excludes some models.

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