Space- and time-like electromagnetic pion form factors in light-cone pQCD

TL;DR

This paper analyzes the electromagnetic pion form factors in both space- and time-like regions using light-cone pQCD, incorporating non-perturbative effects and corrections to reconcile experimental data.

Contribution

It combines space- and time-like form factor analysis with transverse momentum dependence and Sudakov suppression, including non-perturbative and twist-3 corrections.

Findings

Experimental data at moderate energies are well explained.

Inclusion of soft QCD and twist-3 corrections improves data consistency.

Helps resolve discrepancies between space- and time-like measurements.

Abstract

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.