Multiplicity Distribution and Spectra of Negatively Charged Hadrons inAu+AuCollisions atsNN=130GeV

The minimum-bias multiplicity distribution and the transverse momentum and pseudorapidity distributions for central collisions have been measured for negative hadrons ( $h^{-}$) in $\mathrm{Au}+\mathrm{Au}$ interactions at $\sqrt{s_{\mathrm{NN}}}=130\mathrm{}\mathrm{GeV}$. The multiplicity density at midrapidity for the $5\%$ most central interactions is ${\mathrm{dN}}_{h^{-}}/d\eta {|}_{\eta =0\mathrm{}}=280\mathrm{}\pm 1\left(\mathrm{stat}\right)\pm 20\left(\mathrm{syst}\right)$, an increase per participant of $38\%$ relative to $p\overline{p}$ collisions at the same energy. The mean transverse momentum is $0.508\pm 0.012\mathrm{GeV}/c$ and is larger than in central $\mathrm{Pb}+\mathrm{Pb}$ collisions at lower energies. The scaling of the $h^{-}$ yield per participant is a strong function of $p_{\perp }$. The pseudorapidity distribution is almost constant within $|\eta |<1\mathrm{}$.