  In ultrarelativistic heavy ion collisions the baryon-meson ratio is not fully
understood in the intermediate-to-high transverse momentum region. Although
quark coalescence methods combined with jet fragmentation yield results close
to the experimental data, some tendencies are not reproduced and require
further investigation. We propose a new channel, namely extra quark-antiquark
and diquark-antidiquark pair production from coherent gluon field created in
the early stage of heavy ion collisions. This process is described
quantitatively by the time-dependent Schwinger-mechanism. The extra
diquark-quark coalescence yields are able to explain the measured anomalous
baryon production.
