Physics – High Energy Physics
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005iche.conf..705s&link_type=abstract
HIGH ENERGY PHYSICS, ICHEP 2004. Proceedings of the 32nd International Conference. Held 16-22 August 2004 in Beijing, China. Edi
Physics
High Energy Physics
Scientific paper
A study of several 3- and 4-body hadronic final states (π+π-π0, π+π-π+π-, K+K-π+π- and K+K-K+K-) accompanied by hard photon is presented. These states are produced from e+ e- collisions at the c.m. energy near Υ(4S) resonance using 90 fb-1 data sample collected with the BABAR detector at the PEP-II colider. The invariant mass of the hadronic final state determines the virtual photon energy, so that data can be compared with direct e+e- cross sections. The cross sections for the above final states have been obtained from the threshold to 4.5 GeV with about 5% systematic errors. The accuracy of the results are comparable with the best direct e+e- results overall and with much better precision in 1.4-2.5 GeV region where very few data are available. In addition to light meson spectroscopy these data can be used to improve the determination of R - the ratio of e+e- → hadrons cross section to e+e- → μ+μ- - and thereby to impact the understanding of recent (g - 2)μ measurement. The ISR technique also gives access to J/ψ production. Measurements of branching ratios into 3- and 4-body final states given above are made to a level of precision that is tipically better than that obtained in the combined earlier measurements.
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