# The $e^+ e^- \to 3(\pi^+\pi^-), 2(\pi^+pi^-pi^0)$ and $K^+K^- 2(\pi^+pi^-)$ Cross Sections at Center-of-Mass Energies from Production Threshold to 4.5 GeV Measured with Initial-State Radiation

Abstract : We study the processes e+ e- --> 3(pi+pi-)gamma, 2(pi+pi-pi0)gamma and K+ K- 2(pi+pi-)gamma, with the photon radiated from the initial state. About 20,000, 33,000 and 4,000 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(pi+pi-), 2(pi+pi-pi0) and K+ K- 2(pi+pi-) mass spectra, the cross sections for the processes e+ e- --> 3(pi+pi-), e+ e- --> 2(pi+pi-pi0) and e+ e- --> K+ K- 2(pi+pi-) 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 the J/psi in all these final states and measure the corresponding branching fractions.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00025742
Contributor : Claudine Bombar <>
Submitted on : Tuesday, March 7, 2006 - 11:58:56 AM
Last modification on : Wednesday, September 16, 2020 - 4:23:38 PM

### Citation

B. Aubert, R. Barate, D. Boutigny, F. Couderc, Y. Karyotakis, et al.. The $e^+ e^- \to 3(\pi^+\pi^-), 2(\pi^+pi^-pi^0)$ and $K^+K^- 2(\pi^+pi^-)$ Cross Sections at Center-of-Mass Energies from Production Threshold to 4.5 GeV Measured with Initial-State Radiation. Physical Review D, American Physical Society, 2006, 73, pp.052003. ⟨10.1103/PhysRevD.73.052003⟩. ⟨in2p3-00025742⟩

Record views