The NLO time-like rho meson electromagnetic form factors are obtained by analytic continuation of space-like NLO results, with twist-3 contributions dominating and predictions consistent with BABAR.
Space- and time-like electromagnetic pion form factors in light-cone pQCD
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We present a combined analysis of the space- and time-like electromagnetic pion form factors in light-cone perturbative QCD with transverse momentum dependence and Sudakov suppression. Including the non-perturbative ``soft' QCD and power suppressed twist-3 corrections to the standard twist-2 perturbative QCD result, the experimental pion data available at moderate energies/momentum transfers can be explained reasonably well. This may help towards resolving the bulk of the existing discrepancy between the space- and time-like experimental data.
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Next-to-leading-order time-like rho electromagnetic form factors in ${k_{\rm T}}$ factorization
The NLO time-like rho meson electromagnetic form factors are obtained by analytic continuation of space-like NLO results, with twist-3 contributions dominating and predictions consistent with BABAR.