Study of the e[superscript +]e[superscript -] → K[superscript +]K[superscript -] reaction in the energy range from 2.6 to 8.0 GeV
Name
PhysRevD.92.072008.pdf
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Author(s)
Lees, J. P.
Poireau, V.
Tisserand, V.
Grauges, E.
Palano, A.
Eigen, G.
Stugu, B.
Brown, D. N.
Kerth, L. T.
Kolomensky, Yu. G.
Date Issued
October 2015
Journal
Physical Review D
Publisher
American Physical Society
Citation
Lees, J. P., et al. "Study of the e[superscript +]e[superscript -] → K[superscript +]K[superscript -] reaction in the energy range from 2.6 to 8.0 GeV." Phys. Rev. D 92, 072008 (October 2015). © 2015 American Physical Society
Version
Final published version
Abstract
The e[superscript +]e[superscript -] → K[superscript +]K[superscript -] cross section and charged-kaon electromagnetic form factor are measured in the e[superscript +]e[superscript -] center-of-mass energy range (E) from 2.6 to 8.0 GeV using the initial-state radiation technique with an undetected photon. The study is performed using 469 fb[superscript -1] of data collected with the BABAR detector at the PEP-II2 e[superscript +]e[superscript -] collider at center-of-mass energies near 10.6 GeV. The form factor is found to decrease with energy faster than 1/E[superscript 2] and approaches the asymptotic QCD prediction. Production of the K[superscript +]K[superscript -] final state through the J/ψ and ψ(2S) intermediate states is observed. The results for the kaon form factor are used together with data from other experiments to perform a model-independent determination of the relative phases between electromagnetic (single-photon) and strong amplitudes in J/ψ and ψ(2S) → K[superscript +]K[superscript -] decays. The values of the branching fractions measured in the reaction e[superscript +]e[superscript -] → K[superscript +]K[superscript -] are shifted relative to their true values due to interference between resonant and nonresonant amplitudes. The values of these shifts are determined to be about ±5% for the J/ψ meson and ±15% for the ψ(2S) meson.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.92.072008
