Antideuteron production in Υ(nS) decays and in e+e−→qq¯ at s√≈10.58  GeV

We present measurements of the inclusive production of antideuterons in e+e− annihilation into hadrons at ≈10.58 GeV center-of-mass energy and in Υ(1S,2S,3S) decays. The results are obtained using data collected by the BABAR detector at the PEP-II electron-positron collider. Assuming a fireball spectral shape for the emitted antideuteron momentum, we find B(Υ(1S)→d¯X)=(2.81±0.49(stat)+0.20−0.24(syst))×10−5, B(Υ(2S)→d¯X)=(2.64±0.11(stat)+0.26−0.21(syst))×10−5, B(Υ(3S)→d¯X)=(2.33±0.15(stat)+0.31−0.28(syst))×10−5, and σ(e+e−→d¯X)=(9.63±0.41(stat)+1.17−1.01(syst) fb