Space-and Time-like Electromagnetic Kaon Form Factors

TL;DR

This paper investigates the electromagnetic form factors of the charged kaon in both space- and time-like regions using light-cone QCD with perturbative $k_T$-factorization, highlighting the importance of soft QCD effects at moderate energies.

Contribution

It provides a comprehensive analysis of kaon form factors incorporating soft QCD corrections and compares predictions with recent experimental data.

Findings

Predictions align well with CLEO measurements.

Soft QCD effects dominate at low and moderate energies.

Theoretical results are consistent with $J/\psi$ decay analyses.

Abstract

A simultaneous investigation of the space- and time-like electromagnetic form factors of the charged kaon is presented within the framework of light-cone QCD, with perturbative $k_T$-factorization including Sudakov suppression. The effects of power suppressed sub-leading twists and the genuine ``soft'' QCD corrections turn out to be dominant at low- and moderate-energies/momentum transfers $Q^2$. Our predictions agree well with the available moderate-energy experimental data, including the recent results from the CLEO measurements and certain estimates based on the phenomenological analyses of $J/\psi$ decays.