PHOBOS PRELIMINARY Particle Ratios p-bar/p, K-/K+, pi-/pi+ ------------------------------------------------- Cu+Cu 200 GeV - Protons N Ratio Stat Sys Error 21 0.81 0.028 0.061 26 0.788 0.024 0.059 32 0.785 0.021 0.059 39 0.766 0.019 0.057 47 0.794 0.018 0.06 56 0.78 0.016 0.059 67 0.755 0.015 0.057 78 0.772 0.014 0.058 91 0.776 0.013 0.058 99 0.78 0.013 0.059 107 0.78 0.015 0.058 Cu+Cu 62 GeV - Protons N Ratio Stat Sys Error 107 0.551 0.012 0.041 20 0.558 0.01 0.042 24 0.542 0.009 0.041 30 0.563 0.008 0.042 37 0.522 0.007 0.039 44 0.526 0.006 0.039 53 0.521 0.006 0.039 63 0.513 0.005 0.038 75 0.494 0.005 0.037 87 0.483 0.005 0.036 96 0.5 0.005 0.037 Au+Au 200 GeV - Protons N Ratio Stat Sys Error 82 0.774 0.013 0.058 101 0.764 0.012 0.057 123 0.772 0.011 0.058 149 0.737 0.01 0.055 180 0.754 0.009 0.057 215 0.755 0.009 0.057 255 0.72 0.008 0.054 297 0.737 0.008 0.055 330 0.739 0.009 0.055 358 0.729 0.009 0.055 Cu+Cu 200 GeV - Kaons N Ratio Stat Sys Error 21 0.95 0.029 0.058 26 0.986 0.025 0.06 32 1.005 0.023 0.061 39 0.96 0.019 0.058 47 0.989 0.018 0.06 56 0.974 0.016 0.059 67 0.968 0.014 0.059 78 0.989 0.013 0.06 91 0.982 0.012 0.06 99 0.979 0.012 0.06 107 0.976 0.013 0.059 Cu+Cu 62 GeV - Kaons N Ratio Stat Sys Error 107 0.903 0.017 0.055 20 0.913 0.014 0.056 24 0.901 0.012 0.055 30 0.907 0.011 0.055 37 0.884 0.009 0.054 44 0.888 0.008 0.054 53 0.888 0.007 0.054 63 0.899 0.007 0.055 75 0.89 0.006 0.054 87 0.885 0.006 0.054 96 0.885 0.007 0.054 Au+Au 200 GeV - Kaons N Ratio Stat Sys Error 82 0.959 0.012 0.058 101 0.964 0.011 0.059 123 0.954 0.01 0.058 149 0.962 0.009 0.058 180 0.969 0.008 0.059 215 0.964 0.007 0.059 255 0.949 0.007 0.058 297 0.968 0.007 0.059 330 0.959 0.007 0.058 358 0.954 0.008 0.058 Cu+Cu 200 GeV - Pions N Ratio Stat Sys Error 21 0.951 0.006 0.044 26 0.997 0.005 0.046 32 0.985 0.005 0.045 39 0.978 0.004 0.045 47 0.99 0.004 0.045 56 0.99 0.003 0.045 67 0.98 0.003 0.045 78 0.991 0.003 0.045 91 0.979 0.003 0.045 99 1.009 0.003 0.046 107 1.01 0.003 0.046 Cu+Cu 62 GeV - Pions N Ratio Stat Sys Error 107 0.967 0.004 0.044 20 1.005 0.003 0.046 24 1.005 0.003 0.046 30 1.011 0.003 0.046 37 0.979 0.002 0.045 44 0.99 0.002 0.045 53 0.983 0.002 0.045 63 0.998 0.002 0.046 75 0.999 0.002 0.046 87 0.993 0.002 0.046 96 1.01 0.002 0.046 Au+Au 200 GeV - Pions N Ratio Stat Sys Error 82 0.978 0.003 0.045 101 0.982 0.002 0.045 123 0.991 0.002 0.045 149 0.993 0.002 0.046 180 1.002 0.002 0.046 215 0.985 0.002 0.045 255 0.984 0.002 0.045 297 0.997 0.001 0.046 330 0.999 0.002 0.046 358 0.984 0.002 0.045