PROTON AND ANTIPROTON DISTRIBUTIONS AT MIDRAPIDITY IN PROTON-NUCLEUS AND SULFUR-NUCLEUS COLLISIONS

Citation
Ig. Bearden et al., PROTON AND ANTIPROTON DISTRIBUTIONS AT MIDRAPIDITY IN PROTON-NUCLEUS AND SULFUR-NUCLEUS COLLISIONS, Physical review. C. Nuclear physics, 57(2), 1998, pp. 837-846
Citations number
21
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics, Nuclear
ISSN journal
0556-2813
Volume
57
Issue
2
Year of publication
1998
Pages
837 - 846
Database
ISI
SICI code
0556-2813(1998)57:2<837:PAADAM>2.0.ZU;2-E
Abstract
Experiment NA44 has measured proton and antiproton distributions at mi drapidity in sulphur and proton collisions with nuclear targets at 200 and 450 GeV/c per nucleon respectively. The inverse slopes of transve rse mass distributions increase with system size for both protons and antiprotons but are slightly lower for antiprotons. This could happen if antiprotons are annihilated in the nuclear medium. The antiproton y ield increases with system size and centrality and is largest at midra pidity. The proton yield also increases with system size and centralit y, but decreases from backward rapidity to midrapidity. The stopping o f protons at these energies lies between the full stopping and nuclear transparency scenarios. The data are in reasonable agreement with RQM D predictions except for the antiproton yields from sulphur-nucleus co llisions.