Mid-rapidity spectra and yields of K- and K+ have been measured for Au + Au collisions at 4, 6, 8, and 10.7 AGeV. The K- yield increases faster with beam energy than for K+ and hence the K-/K+ ratio increases with beam energy. This ratio is studied as a function of both √s and √s - √s(th) which allows the direct comparison of the kaon yields with respect to the production threshold in p + p reactions. For equal √s - √s(th) the measured ratio K-/K+ = 0.2 at energies above threshold in contrast to the K-/K+ ratio of near unity observed at energies below threshold. The use of the K-/K+ ratio to test the predicted changes of kaon properties in dense nuclear matter is discussed. (C) 2000 Elsevier Science B.V.
|Number of pages||8|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2000 Sep 28|
Bibliographical noteFunding Information:
This work was supported by the US Department of Energy under contracts with ANL (W-31-109-ENG-38), BNL (DE-AC02-98CH10886), and grants to the University of California, Riverside (DE-FG03-86ER40271), Columbia University (DE-FG02-86-ER40281), University of Illinois, Chicago (DE-FG02-94ER40865), LLNL (W-7405-ENG-48), and MIT (DE-FC02-94ER40818), the US National Science Foundation under a grant with University of Rochester (PHY-9722606), US NASA under contract with the University of California (NGR-05-003-513), Ministry of Education, Science, Sports and Culture (Japan), and by Korea Research Foundation (1997-001-D00118).
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics