Antiproton Production in $p+A$ Collisions at AGS Energies

Details Antiproton Production in $p+A$ Collisions at AGS Energies Antiproton Production in $p+A$ Collisions at AGS Energies

2001-07-19

arxiv.org/abs/nucl-ex/0107013v1

Physics

Nuclear Physics

Nuclear Experiment

8 pages, 6 figures

Scientific paper

10.1103/PhysRevC.64.064908

Inclusive and semi-inclusive measurements are presented for antiproton ($\bar{p}$) production in proton-nucleus collisions at the AGS. The inclusive yields per event increase strongly with increasing beam energy and decrease slightly with increasing target mass. The $\bar{p}$ yield in 17.5 GeV/c p+Au collisions decreases with grey track multiplicity, $N_g$, for $N_g>0$, consistent with annihilation within the target nucleus. The relationship between $N_g$ and the number of scatterings of the proton in the nucleus is used to estimate the $\bar{p}$ annihilation cross section in the nuclear medium. The resulting cross section is at least a factor of five smaller than the free $\bar{p}-p$ annihilation cross section when assuming a small or negligible formation time. Only with a long formation time can the data be described with the free $\bar{p}-p$ annihilation cross section.

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