Author/Authors :
E866 Collaboration، نويسنده , , L Ahle، نويسنده , , Y Akiba، نويسنده , , K Ashktorab، نويسنده , , M.D. Baker ، نويسنده , , D Beavis، نويسنده , , B Budick، نويسنده , , J Chang، نويسنده , , C Chasman، نويسنده , , Z Chen، نويسنده , , Y.Y. Chu، نويسنده , , T Chujo، نويسنده , , J Cumming، نويسنده , , R Debbe، نويسنده , , J.C. Dunlop، نويسنده , , W Eldredge، نويسنده , , K Fleming، نويسنده , , S.-Y Fung، نويسنده , , E Garcia، نويسنده , , S Gushue، نويسنده , , et al.، نويسنده ,
Abstract :
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−sth which allows the direct comparison of the kaon yields with respect to the production threshold in p+p reactions. For equal s−sth 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.
