Antideuteron production in $\mathrm{{\rm Y}}(nS)$ decays and in $e^{+}{e}^{-}\to q\bar{q}$ at $\sqrt{s}\approx 10.58\mathrm{G}\mathrm{e}\mathrm{V}$

We present measurements of the inclusive production of antideuterons in $e^{+}{e}^{-}$ annihilation into hadrons at $\approx 10.58 \mathrm{,Ge\kern -0.1em V}$center-of-massenergyandin$\Upsilon(1S,2S,3S)$ 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 $$\mathcal{B}$(\Upsilon(1S) \to \bar{d}X) = (2.81 \pm 0.49 $(\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t})$ {}^{+0.20}{-0.24} $(\mathrm{s}\mathrm{y}\mathrm{s}\mathrm{t})$)/! \times /! 10^{-5}$,$$\mathcal{B}$(\Upsilon(2S) \to \bar{d}X) = (2.64 \pm 0.11 $(\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t})$ {}^{+0.26}{-0.21} $(\mathrm{s}\mathrm{y}\mathrm{s}\mathrm{t})$)/! \times /! 10^{-5}$,$$\mathcal{B}$(\Upsilon(3S) \to \bar{d}X) = (2.33 \pm 0.15 $(\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t})$ {}^{+0.31}{-0.28} $(\mathrm{s}\mathrm{y}\mathrm{s}\mathrm{t})$)/! \times /! 10^{-5}$,and$\sigma (e^+e^- \to \bar{d}X) = (9.63 \pm 0.41 $(\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t})$ {}^{+1.17}{-1.01} $(\mathrm{s}\mathrm{y}\mathrm{s}\mathrm{t})$) \mbox{,fb}$.