Abstract
Charge asymmetry in the processes and is measured using of data collected with the BABAR detector at center-of-mass energies near 10.58 GeV. An observable is introduced and shown to be very robust against detector asymmetries while keeping a large sensitivity to the physical charge asymmetry that results from the interference between initial- and final-state radiation (FSR). The asymmetry is determined as a function of the invariant mass of the final-state tracks from production threshold to a few . It is compared to the expectation from QED for , and from theoretical models for . A clear interference pattern is observed in , particularly in the vicinity of the resonance. The inferred rate of lowest-order FSR production is consistent with the QED expectation for , and is negligibly small for .
22 More- Received 1 September 2015
DOI:https://doi.org/10.1103/PhysRevD.92.072015
© 2015 American Physical Society