Antideuteron yield at the AGS and coalescence implications
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.
Armstrong
TA
Pennsylvania State University, University Park, Pennsylvania 16802, USA.
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
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Hill
JC
Hirsch
AS
Hoversten
R
Huang
HZ
Jaradat
H
Kumar
BS
Lainis
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Lajoie
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Li
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Libby
B