Polarization effects in the reaction $e^++e^-\to ρ^+ +ρ^- $ and determination of the $ρ-$ meson form factors in the time--like region

Details Polarization effects in the reaction $e^++e^-\to ρ^+ +ρ^- $ and determination of the $ρ-$ meson form factors in the time--like region Polarization effects in the reaction $e^++e^-\to ρ^+ +ρ^- $ and determination of the $ρ-$ meson form factors in the time--like region

2007-06-08

arxiv.org/abs/0706.1125v1

Phys.Rev.C75:065202,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 2 figures, to appear in Phys Rev C

Scientific paper

10.1103/PhysRevC.75.065202

The electron positron annihilation reaction into four pion production has been studied, through the channel $e^++e^-\to \bar \rho+\rho $. The differential (and total) cross sections and various polarization observables for this reaction have been calculated in terms of the electromagnetic form factors of the corresponding $\gamma^*\rho\rho $ current. The elements of the spin--density matrix of the $\rho -$meson were also calculated. Numerical estimations have been done, with the help of phenomenological form factors obtained in the space--like region of the momentum transfer squared and analytically extended to the time-like region.

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