Antilambda production in Au+Au collisions at 11.7 A{center_dot}GeV/c.
/ Authors
B. Back, R. Betts, J. Chang, W. Chang, C. Chi, Y. Y. Chu, J. Cumming, J. Dunlop, W. Eldredge, S. Fung
and 29 more authors
R. Ganz, E. Garcia, A. Gillitzer, G. Heintzelman, W. Henning, D. Hofman, B. Holzman, J. Kang, E. Kim, S. Y. Kim, Y. Kwon, D. Mcleod, A. Mignerey, M. Moulson, V. Nanal, C. Ogilvie, R. Pak, A.Ruangma, D. Russ, R. Seto, P. Stanskas, G. Stephans, H. Wang, F. Wolfs, A. Wuosmaa, H. Xiang, G. Xu, H. Yao, C. Zou
/ Abstract
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 dN{bar {lambda}} /dy = 1.2{sub -0.6-0.2}{sup +0.7+0.2}x10{sup -3} in peripheral collisions to 19{sub -5-2}{sup +4+3}x10{sup -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. The {bar {lambda}} /{bar p} ratio near midrapidity increases from 0.26{sub -0.15-0.4}{sup +0.19+0.5} in peripheral collisions to 3.6{sub -1.8-1.1}{sup +4.7+2.7} in central collisions, a value larger than current theoretical estimates.
Journal: Physical Review Letters