Antilambda Production in $Au+Au$ Collisions at $11.7\mathit{A}\mathrm{GeV}/\mathit{c}$

We present results for antilambda and antiproton production in $\mathrm{Au}+\mathrm{Au}$ collisions at $11.7A\mathrm{GeV}/c$ including spectra and extracted invariant yields for both species in central and peripheral collisions in the rapidity range $1.0<y<\mathrm{}1.4\mathrm{}$. The antilambda yield increases from ${\mathrm{dN}}_{\overline{\Lambda }}{/dy=1.2\mathrm{}}_{-0.6-0.2\mathrm{}}^{+0.7+0.2\mathrm{}}\times {10}^{-3\mathrm{}}$ in peripheral collisions to ${19}_{-5-2\mathrm{}}^{+4+3\mathrm{}}\times {10}^{-3\mathrm{}}$ in central collisions. The direct antiproton yield is deduced from the measured total antiproton spectra to extract the ratio of antilambda-to-direct-antiproton production. The $\overline{\Lambda }/\overline{p}$ ratio near midrapidity increases from ${0.26}_{-0.15-0.4\mathrm{}}^{+0.19+0.5\mathrm{}}$ in peripheral collisions to ${3.6}_{-1.8-1.1\mathrm{}}^{+4.7+2.7\mathrm{}}$ in central collisions, a value larger than current theoretical estimates.