in sqrt(s_NN) calculations for fixed-target systems:

1. Ebeam quoted are mostly just kinetic part, not the total energy
2. instead of proton's mass (0.938272 GeV/c2). one should use nucleon's mass (0.9315)

sqrt(s_NN) = sqrt(2*m*(Ebeam+2*m))

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last updated: 17 nov 2003