Antiproton-deuteron annihilation intoΛ+anything below 1 GeV/c

Abstract

We present data on $\ensuremath{\Lambda}$ production from two experiments in which the ANL 12-foot and the BNL 30-inch deuterium-filled bubble chambers were exposed to antiproton beams from 550 to 900 MeV/c. Some features of the data are compared to calculations of double scattering using $\overline{K}$ and $\overline{\ensuremath{\Lambda}}$ as the exchanged particles. The $\ensuremath{\Lambda}$ final states in our experiments exhibit behavior which suggests that a double-scattering mechanism with a $\overline{K}$ exchanged between the two nucleons is the most likely candidate for the $\ensuremath{\Lambda}$ production mechanism. The data are compared with two other experiments in which $\ensuremath{\Lambda}$ events are produced above the $\overline{p}d\ensuremath{\rightarrow}\overline{\ensuremath{\Lambda}}\ensuremath{\Lambda}N$ threshold. A test of isospin invariance in these reactions is also reported.

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