Experimental constraint on the $\rho -$ meson form factors in the time--like region

Abstract

The annihilation reaction $e^{+}+e^{-}\to \bar{\rho }+\rho$ is considered. The constraint on time-like $\rho$-meson form factors from the measurement done by the BaBar collaboration at $\sqrt{s}=10.5$ GeV is analyzed.

Comments: 10 pages 3 figures