Antideuteron yield at the AGS and coalescence implications

Details Antideuteron yield at the AGS and coalescence implications Antideuteron yield at the AGS and coalescence implications

2000-05-01

arxiv.org/abs/nucl-ex/0005001v1

Phys.Rev.Lett.85:2685-2688,2000

Physics

Nuclear Physics

Nuclear Experiment

8 pages, 4 figures, Latex, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.85.2685

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=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=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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