New insight into antiproton production and reabsorption using proton-nucleus collisions at the AGS

摘要

Antiproton ((p) over bar) yields are presented for proton-nucleus collisions, with targets Be, Cu, and Au, at beam momenta of 12.3 and 17.5 GeV/c. In addition to target size and beam momentum, the number of projectile collisions nu, as derived from the number of "grey" tracks (slow protons and deuterons), is used to disentangle the (p) over bar reabsorption from the production. By quantifying the amount of reabsorption of the (p) over bar within the nucleus as a function of nu, the annihilation within the nucleus is estimated and compared to the free annihilation cross section. Preliminary results on antilambda ((&ULambda;) over bar) production as a function of nu are also presented for comparison. [References: 14]