Study of the $e^+e^-\to K^+K^-$ reaction in the energy range from 2.6 to 8.0 GeV

J. P. Lees 1 V. Poireau 1 V. Tisserand 1 N. Arnaud 2 M. Davier 2 D. Derkach 2 G. Grosdidier 2 F. Le Diberder 2 A. M. Lutz 2 B. Malaescu 2 P. Roudeau 2 A. Stocchi 2 G. Wormser 2
1 LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules - Laboratoire d'Annecy de Physique des Particules
2 LAL - Laboratoire de l'Accélérateur Linéaire
Abstract : The $e^+e^-\to K^+K^-$ cross section and charged-kaon electromagnetic form factor are measured in the $e^+e^-$ 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$^{-1}$ of data collected with the BABAR detector at the PEP-II $e^+e^-$ collider at center-of-mass energies near 10.6 GeV. The form factor is found to decrease with energy faster than $1/E^2$, and approaches the asymptotic QCD prediction. Production of the $K^+K^-$ final state through the $J/\psi$ and $\psi(2S)$ 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 single-photon and strong amplitudes in $J/\psi$ and $\psi(2S)\to K^+K^-$ decays. The values of the branching fractions measured in the reaction $e^+e^- \to K^+K^-$ 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 $\pm5\%$ for the $J/\psi$ meson and $\pm15\%$ for the $\psi(2S)$ meson.
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Physical Review D, American Physical Society, 2015, 92, pp.072008. 〈10.1103/PhysRevD.92.072008〉
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Contributeur : Sabine Starita <>
Soumis le : vendredi 17 juillet 2015 - 11:08:04
Dernière modification le : jeudi 11 janvier 2018 - 06:14:13

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J. P. Lees, V. Poireau, V. Tisserand, N. Arnaud, M. Davier, et al.. Study of the $e^+e^-\to K^+K^-$ reaction in the energy range from 2.6 to 8.0 GeV. Physical Review D, American Physical Society, 2015, 92, pp.072008. 〈10.1103/PhysRevD.92.072008〉. 〈in2p3-01177828〉

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