title: Antideuteron yield at the AGS and coalescence implications
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.
authors.affiliation: Pennsylvania State University, University Park, Pennsylvania 16802, USA.
authors.initials: TA
authors.lastname: Armstrong
authors.initials: KN
authors.lastname: Barish
authors.initials: S
authors.lastname: Batsouli
authors.initials: SJ
authors.lastname: Bennett
authors.initials: M
authors.lastname: Bertaina
authors.initials: A
authors.lastname: Chikanian
authors.initials: SD
authors.lastname: Coe
authors.initials: TM
authors.lastname: Cormier
authors.initials: R
authors.lastname: Davies
authors.initials: CB
authors.lastname: Dover
authors.initials: P
authors.lastname: Fachini
authors.initials: B
authors.lastname: Fadem
authors.initials: LE
authors.lastname: Finch
authors.initials: NK
authors.lastname: George
authors.initials: SV
authors.lastname: Greene
authors.initials: P
authors.lastname: Haridas
authors.initials: JC
authors.lastname: Hill
authors.initials: AS
authors.lastname: Hirsch
authors.initials: R
authors.lastname: Hoversten
authors.initials: HZ
authors.lastname: Huang
authors.initials: H
authors.lastname: Jaradat
authors.initials: BS
authors.lastname: Kumar
authors.initials: T
authors.lastname: Lainis
authors.initials: JG
authors.lastname: Lajoie
authors.initials: Q
authors.lastname: Li
authors.initials: B
authors.lastname: Libby