K. Adcox et al., Measurement of the midrapidity transverse energy distribution from root(NN)-N-S=130 GeV Au+Au collisions at RHIC - art. no. 052301, PHYS REV L, 8705(5), 2001, pp. 2301
The first measurement of energy produced transverse to the beam direction a
t the Relativistic Heavy-Ion Collider at Brookhaven National Laboratory is
presented. The midrapidity transverse energy density per participating nucl
eon rises steadily with the number of participants, closely paralleling the
rise in charged-particle density, such that (E-T)/(N-ch) remains relativel
y constant as a function of centrality. The energy density calculated via B
jorken's prescription for the 2% most central Au + Au collisions at rootS(N
N) = 130 GeV is at least epsilon (Bj) = 4.6 GeV/fm(3), which is a factor of
1.6 larger than found at rootS(NN) = 17.2 GeV (Pb + Pb at CERN).