XIV Hadron Physics 2018

Perturbative QCD and Spin-1

20 Mar 2018, 16:00

1h

Florianopolis, Brazil

Poster Tuesday Posters

Speaker

João Pacheco De Melo (Universidade Cruzeiro do Sul)

Description

The annihilation or production process $e^{+}+e^{-}\to {\rho }^{+}+{\rho }^{-}$ is studied with respect to the
universal perturbative QCD (pQCD) predictions. Sub-leading contributions
are considered together with the universal leading pQCD amplitudes such that
the matrix elements of the $\rho$-meson electromagnetic current satisfy
the constraint from the light-front angular condition. The data from the
BaBar collaboration for the time-like $\rho$-meson
form factors at $\sqrt{s}=10.58$ GeV puts a stringent
test to the onset of asymptotic pQCD behaviour. The $e^{+}+e^{-}\to {\rho }^{+}+{\rho }^{-}$ cross-section for $s$ between 60 GeV${}^2$ and
160 GeV${}^2$ is predicted where the sub-leading contributions are still considerable.

References:
1. B. Aubert, et. al., Babar collaboration, Phys. Rev. D78 (2008) 071103
2. J. P. B. C. de Melo, C. R. ji and T. Frederico, Phys. Lett. B 763 (2016) 87.