Next-to-leading-order time-like pion form factors in $k_T$ factorization

Abstract

We calculate the time-like pion-photon transition form factor and the pion electromagnetic form factor up to next-to-leading order (NLO) of the strong coupling constant in the leading-twist $k_T$ factorization formalism. It is found that the NLO corrections to the magnitude (phase) are lower than 30% ($30^{\circ }$) for the former, and lower than 25% ($10^{\circ }$) for the latter at large invariant mass squared $Q^2>30$ GeV${}^2$ of the virtual photons. The increase of the strong phases with $Q^2$ is obtained, consistent with the tendency indicated by experimental data. This behavior is attributed to the inclusion of parton transverse momenta $k_T$, implying that the $k_T$ factorization is an appropriate framework for analyzing complex time-like form factors. Potential extensions of our formalism to two-body and three-body hadronic $B$ meson decays are pointed out.

Version to appear in Phys.Lett.B

References in corpus (5)

• Moments of pseudoscalar meson distribution amplitudes from the lattice
• Pion transition form factor in k_T factorization
• Next-to-leading-order corrections to exclusive processes in $k_T$ factorization
• Spacelike pion form factor from analytic continuation and the onset of perturbative QCD
• Space-and Time-like Electromagnetic Kaon Form Factors