We present results for antilambda and antiproton production in Au + Au collisions at 11.7 A GeV/c including spectra and extracted invariant yields for both species in central and peripheral collisions in the rapidity range 1.0 <y < 1.4. The antilambda yield increases from dNΛ¯/dy = 1.2 +0.7+0.2−0.6−0.2 × 10−3 in peripheral collisions to 19+4+3−5−2 × 10−3 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.TheΛ¯/p¯ ratio near midrapidity increases from 0.26+0.19+0.5−0.15−0.4 in peripheral collisions to 3.6+4.7+2.7−1.8 −1.1 in central collisions, a value larger than current theoretical estimates.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)