Medium effects in kaon and antikaon production in nuclear collisions at subthreshold beam energies

Citation
F. Laue et al., Medium effects in kaon and antikaon production in nuclear collisions at subthreshold beam energies, PHYS REV L, 82(8), 1999, pp. 1640-1643
Citations number
28
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
0031-9007 → ACNP
Volume
82
Issue
8
Year of publication
1999
Pages
1640 - 1643
Database
ISI
SICI code
0031-9007(19990222)82:8<1640:MEIKAA>2.0.ZU;2-K
Abstract
Production cross sections of K+ and K- mesons have been measured in C + C c ollisions at beam energies per nucleon below and near the nucleon-nucleon t hreshold. At a given beam energy, the spectral slopes of the K- mesons are significantly steeper than the ones of the K+ mesons. The excitation functi ons for K+ and K- mesons nearly coincide when correcting for the threshold energy. In contrast, the K+ yield exceeds the K- yield by a factor of about 100 in proton-proton collisions at beam energies near the respective nucle on-nucleon thresholds.