| Abstract |
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We study the e+e- --> Lambda anti-Lambda gamma, Lambda anti-Sigma0 gamma,
Sigma0 anti-Sigma0 gamma processes using 230 fb-1 of integrated luminosity
collected by the BaBar detector at e+e- center-of-mass energy of 10.58 GeV.
From the analysis of the baryon-antibaryon mass spectra the cross
sections for e+e- --> Lambda anti-Lambda, Lambda anti-Sigma0,
Sigma0 anti-Sigma0 are measured in the dibaryon mass range from threshold
up to 3 GeV/c^2. The ratio of electric and magnetic form factors,
|G_E/G_M|, is measured for e+e- --> Lambda anti-Lambda, and limits
on the relative phase between Lambda form factors are obtained.
We also measure the J/psi --> Lambda anti-Lambda, Sigma0 anti-Sigma0 and
psi(2S) --> Lambda anti-Lambda branching fractions.
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