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

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 $\pm 5\%$ for the $J/\psi$ meson and $\pm 15\%$ for the $\psi (2S)$ meson.

18 pages, 19 postscript figures

References in corpus (9)

• Big-Bang Nucleosynthesis
• Study of e+e- --> p anti-p via initial-state radiation at BABAR
• Precision Measurement of the e+e- --> K+K-(gamma) Cross Section with the Initial-State Radiation Method at BaBar
• Measurement of the e+e- --> p anti-p cross section in the energy range from 3.0 to 6.5 GeV
• High Precision Measurements of the Form Factors of Pion, Kaon, and Proton at Large Timelike Momentum Transfers
• Cross sections for the reactions $e^{+}{e}^{-}\to K_S^0{K}_L^0$, $K_S^0{K}_L^0{\pi }^{+}{\pi }^{-}$, $K_S^0{K}_S^0{\pi }^{+}{\pi }^{-}$, and $K_S^0{K}_S^0{K}^{+}{K}^{-}$ from events with initial-state radiation
• Measurement of the e+e- -> K+K- cross section in the energy range s**(1/2) = 1.04 - 1.38 GeV with the SND detector in the experiment at the VEPP-2M e+e- collider
• First Measurement of the Electromagnetic Form Factor of the Neutral Kaon at a Large Momentum Transfer and the Effect of $SU(3)$ Breaking
• Phase Difference Between the Electromagnetic and Strong Amplitudes for psi(2S) and J/psi Decays into Pairs of Pseudoscalar Mesons

Cited by in corpus (9)

• Measurement of $e^{+}{e}^{-}\to K^{+}{K}^{-}$ cross section at $\sqrt{s}=2.00-3.08$ GeV
• Hadronic Footprint of GeV-Mass Dark Matter
• Contributions for the kaon pair from $\rho (770)$, $\omega (782)$ and their excited states in the $B\to K\bar{K}h$ decays
• Measurement of the $e^{+}{e}^{-}\to K_S^0{K}^{\pm }{\pi }^{\mp }{\pi }^0$ and $K_S^0{K}^{\pm }{\pi }^{\mp }\eta$ cross sections using initial-state radiation
• Branching fraction measurement of $J/\psi \to K_S{K}_L$ and search for $J/\psi \to K_S{K}_S$
• Symmetry analysis of charmonium two-body decay
• Low-energy hadronic cross sections measurements at BABAR and g-2 of the muon
• Analytical formula for the cross section of hadron production from $e^{+}{e}^{-}$ collisions around the narrow charmouinum resonances
• Proton and kaon timelike form factors from BABAR