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Antideuteron yield at the AGS and coalescence implications
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We present Experiment 864's measurement of invariant antideuteron yields in 11.5A GeV/c Au + Pt collisions. The analysis includes 250 million triggers representing 14 billion 10% central interactions sampled for events with high mass candidates. We find (1/2 pi pt) d^(2)N/dydpt = 3.5 +/- 1.5 (stat.) +0.9,-0.5 (sys.) x 10^(-8) GeV^(-2)c^(2) for 1.8<y<2.2, <pt>=0.35 GeV/c (y(cm)=1.6) and 3.7 +/- 2.7 (stat.) +1.4,-1.5 (sys.) x 10^(-8) GeV^(-2)c^(2) for 1.4<y<1.8, <pt>=0.26 GeV/c, and a coalescence parameter B2-bar of 4.1 +/- 2.9 (stat.) +2.3,-2.4 (sys.) x 10^(-3) GeV^(2)c^(-3). Implications for the coalescence model and antimatter annihilation are discussed.
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Inelastic Antideutron Interaction with Nuclei
An intranuclear cascade Monte Carlo generator reproduces measured inelastic antideuteron-nucleus cross sections above roughly 0.65 GeV/c and predicts multiplicities and stripping fractions for ALICE-like detector nuclei.
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