The $e^{+}{e}^{-}\to 2({\pi }^{+}{\pi }^{-}){\pi }^0$, 2(π^+π^-)η$,$K^+ K^-π^+π^-π^0$and$K^+ K^-π^+π^-η$ Cross Sections Measured with Initial-State Radiation

Abstract

We study the processes $e^{+}{e}^{-}\to 2({\pi }^{+}{\pi }^{-}){\pi }^0\gamma$, $2({\pi }^{+}{\pi }^{-})\eta \gamma$, $K^{+}{K}^{-}{\pi }^{+}{\pi }^{-}{\pi }^0\gamma$ and $K^{+}{K}^{-}{\pi }^{+}{\pi }^{-}\eta \gamma$ with the hard photon radiated from the initial state. About 20000, 4300, 5500 and 375 fully reconstructed events, respectively, are selected from 232 fb${}^{-1}$ of BaBar data. The invariant mass of the hadronic final state defines the effective $e^{+}{e}^{-}$ center-of-mass energy, so that the obtained cross sections from the threshold to about 5 GeV can be compared with corresponding direct \epem measurements, currently available only for the $\eta {\pi }^{+}{\pi }^{-}$ and $\omega {\pi }^{+}{\pi }^{-}$ submodes of the $e^{+}{e}^{-}\to 2({\pi }^{+}{\pi }^{-}){\pi }^0$ channel. Studying the structure of these events, we find contributions from a number of intermediate states, and we extract their cross sections where possible. In particular, we isolate the contribution from $e^{+}{e}^{-}\to \omega (782){\pi }^{+}{\pi }^{-}$ and study the $\omega (1420)$ and $\omega (1650)$ resonances. In the charmonium region, we observe the $J/\psi$ in all these final states and several intermediate states, as well as the $\psi (2S)$ in some modes, and we measure the corresponding branching fractions.

30 pages, 43 postscript figures, submitted to Phys.Rev.D

References in corpus (2)

• The $e^{+}{e}^{-}\to K^{+}{K}^{-}{\pi }^{+}{\pi }^{-}$, $K^{+}{K}^{-}{\pi }^0{\pi }^0$ and $K^{+}{K}^{-}{K}^{+}{K}^{-}$ Cross Sections Measured with Initial-State Radiation
• The hadronic contribution to (g-2) of the muon

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