The e+e3(π+π), 2(π+ππ0) and K+K2(π+π) cross sections at center-of-mass energies from production threshold to 4.5 GeV measured with initial-state radiation

B. Aubert et al.
Phys. Rev. D 73, 052003 – Published 7 March 2006

Abstract

We study the processes e+e3(π+π)γ, 2(π+ππ0)γ and K+K2(π+π)γ, with the photon radiated from the initial state. About 20 000, 33 000 and 4000 fully reconstructed events, respectively, have been selected from 232fb1 of BABAR data. The invariant mass of the hadronic final state defines the effective e+e center-of-mass energy, so that these data can be compared with the corresponding direct e+e measurements. From the 3(π+π), 2(π+ππ0) and K+K2(π+π) mass spectra, the cross sections for the processes e+e3(π+π), e+e2(π+ππ0) and e+eK+K2(π+π) are measured for center-of-mass energies from production threshold to 4.5 GeV. The uncertainty in the cross section measurement is typically 6%–15%. We observe a structure at 1.9 GeV in both cross sections and a resonance structure with mass 1645±0.008GeV/c2 and width 0.114±0.014GeV when the ω(782)η final state is extracted. We observe the J/ψ in all these final states and measure the corresponding branching fractions.

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  • Received 3 February 2006

DOI:https://doi.org/10.1103/PhysRevD.73.052003

©2006 American Physical Society

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Vol. 73, Iss. 5 — 1 March 2006

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