Ratios of charged antiparticles-to-particles near mid-rapidity in Au + Au collisions at sqrt[s(NN)]=130 GeV.

Phys Rev Lett

Physics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843, USA.

Published: September 2001

We have measured the ratios of antiparticles to particles for charged pions, kaons, and protons near mid-rapidity in central Au+Au collisions at sqrt[s(NN)] = 130 GeV. We observe / = 1.00+/-0.01(stat)+/-0.02(syst), / = 0.91+/-0.07(stat)+/-0.06(syst), and

= 0.60+/-0.04(stat)+/-0.06(syst). The / and

ratios give a consistent estimate of the baryo-chemical potential mu(B) of 45 MeV, a factor of 5-6 smaller than in central Pb+Pb collisions at sqrt[s(NN)] = 17.2 GeV.

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http://dx.doi.org/10.1103/PhysRevLett.87.102301	DOI Listing

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