  We report on the first production of an antihydrogen beam by charge exchange
of 6.1 keV antiprotons with a cloud of positronium in the GBAR experiment at
CERN. The antiproton beam was delivered by the AD/ELENA facility. The
positronium target was produced from a positron beam itself obtained from an
electron linear accelerator. We observe an excess over background indicating
antihydrogen production with a significance of 3-4 standard deviations.
