18-23 March 2018
Florianopolis, Brazil
America/Sao_Paulo timezone

Perturbative QCD and Spin-1

20 Mar 2018, 16:00
Florianopolis, Brazil

Florianopolis, Brazil


João Pacheco De Melo (Universidade Cruzeiro do Sul)


The annihilation or production process $e^++e^-\rightarrow \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^-\rightarrow \rho^+ +\rho^- $ cross-section for $s$ between 60 GeV$^2$ and
160 GeV$^2$ is predicted where the sub-leading contributions are still considerable.

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.

Primary authors

Chueng Ji (North Carolina State University) Tobias Frederico (Instituto Tecnologico de Aeronautica) João Pacheco De Melo (Universidade Cruzeiro do Sul)

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