Antideuteron yield at the AGS and coalescence implications

Authors :: Armstrong TA
Barish KN
Batsouli S
Bennett SJ
Bertaina M
Chikanian A
Coe SD
Cormier TM
Davies R
Dover CB
Fachini P
Fadem B
Finch LE
George NK
Greene SV
Haridas P
Hill JC
Hirsch AS
Hoversten R
Huang HZ
Jaradat H
Kumar BS
Lainis T
Lajoie JG
Li Q
Libby B
Source :: Physical review letters [Phys Rev Lett] 2000 Sep 25; Vol. 85 (13), pp. 2685-8.
Publication Year :: 2000
Abstract: We present Experiment 864's measurement of invariant antideuteron yields in 11.5A GeV/c Au+Pt collisions. The analysis includes 250x10(6) triggers representing 14x10(9) 10% central interactions sampled for events with high mass candidates. We find (1/2pip(t))d(2)N/dydp(t) = 3.5+/-1.5(stat)+0.9-0.5(syst)x10(-8) GeV-2 c(2) for 1.8<y<2.2, < p(t)> = 0.35 GeV/c ( y(c.m.) = 1.6) and 3.7+/-2.7(stat)+1.4-1.5(syst)x10(-8) GeV-2 c(2) for 1.4<y<1.8, < p(t)> = 0.26 GeV/c, and a coalescence parameter B2; of 4.1+/-2. 9(stat)+2.3-2.4(syst)x10(-3) GeV2 c(-3). Implications for coalescence and antimatter annihilation are discussed.