Measurement of initial-state–final-state radiation interference in the processes e+eμ+μγ and e+eπ+πγ

J. P. Lees et al. (The BABAR Collaboration)
Phys. Rev. D 92, 072015 – Published 28 October 2015

Abstract

Charge asymmetry in the processes e+eμ+μγ and e+eπ+πγ is measured using 232fb1 of data collected with the BABAR detector at e+e 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 GeV/c2. It is compared to the expectation from QED for e+eμ+μγ, and from theoretical models for e+eπ+πγ. A clear interference pattern is observed in e+eπ+πγ, particularly in the vicinity of the f2(1270) resonance. The inferred rate of lowest-order FSR production is consistent with the QED expectation for e+eμ+μγ, and is negligibly small for e+eπ+πγ.

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  • Received 1 September 2015

DOI:https://doi.org/10.1103/PhysRevD.92.072015

© 2015 American Physical Society

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Vol. 92, Iss. 7 — 1 October 2015

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