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The e+e-→3(π+π-), 2(π+π-π0) and K+K-2(π+π-) cross sections at center-of-mass energies from production threshold to 4.5 GeV measured with initial-state radiation

Aubert, B. et al. (2006) The e+e-→3(π+π-), 2(π+π-π0) and K+K-2(π+π-) cross sections at center-of-mass energies from production threshold to 4.5 GeV measured with initial-state radiation. Physical Review D, 73 (5). 052003. ISSN 1550-7998

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Abstract

We study the processes e+e-→3(π+π-)γ, 2(π+π-π0)γ and K+K-2(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 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 these data can be compared with the corresponding direct e+e- measurements. From the 3(π+π-), 2(π+π-π0) and K+K-2(π+π-) mass spectra, the cross sections for the processes e+e-→3(π+π-), e+e-→2(π+π-π0) and e+e-→K+K-2(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±0.008 GeV/c2 and width 0.114±0.014 GeV 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.

Item Type: Article
Subjects: Q Science > QC Physics
Schools: School of Human and Health Sciences
School of Human and Health Sciences > International Research Centre for Investigative Psychology
Depositing User: Sharon Beastall
Date Deposited: 08 Apr 2011 10:32
Last Modified: 08 Apr 2011 10:32
URI: http://eprints.hud.ac.uk/id/eprint/10080

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