The e{sup +}e{sup -}{yields}3({pi}{sup +}{pi}{sup -}), 2({pi}{sup +}{pi}{sup -}{pi}{sup 0}) and K{sup +}K{sup -}2({pi}{sup +}{pi}{sup -}) cross sections at center-of-mass energies from production threshold to 4.5 GeV measured with initial-state radiation
We study the processes e{sup +}e{sup -}{yields}3({pi}{sup +}{pi}{sup -}){gamma}, 2({pi}{sup +}{pi}{sup -}{pi}{sup 0}){gamma} and K{sup +}K{sup -}2({pi}{sup +}{pi}{sup -}){gamma}, 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{sup -1} of BABAR data. The invariant mass of the hadronic final state defines the effective e{sup +}e{sup -} center-of-mass energy, so that these data can be compared with the corresponding direct e{sup +}e{sup -} measurements. From the 3({pi}{sup +}{pi}{sup -}), 2({pi}{sup +}{pi}{sup -}{pi}{sup 0}) and K{sup +}K{sup -}2({pi}{sup +}{pi}{sup -}) mass spectra, the cross sections for the processes e{sup +}e{sup -}{yields}3({pi}{sup +}{pi}{sup -}), e{sup +}e{sup -}{yields}2({pi}{sup +}{pi}{sup -}{pi}{sup 0}) and e{sup +}e{sup -}{yields}K{sup +}K{sup -}2({pi}{sup +}{pi}{sup -}) 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/c{sup 2} and width 0.114{+-}0.014 GeV when the {omega}(782){eta} final state is extracted. We observe the J/{psi} in all these final states and measure the corresponding branching fractions.
- OSTI ID:
- 20776829
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 73, Issue 5; Other Information: DOI: 10.1103/PhysRevD.73.052003; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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