Open charm yields in d+Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV

Abstract

Mid-rapidity open charm spectra from direct reconstruction of $D^0$($\overline{D^0}$)$\to K^{\mp }{\pi }^{\pm }$ in d+Au collisions and indirect electron/positron measurements via charm semileptonic decays in p+p and d+Au collisions at \srt = 200 GeV are reported. The $D^0$($\overline{D^0}$) spectrum covers a transverse momentum ($p_T$) range of 0.1 $<p_T<$ 3 \GeVc whereas the electron spectra cover a range of 1 $<p_T<$ 4 GeV/$c$. The electron spectra show approximate binary collision scaling between p+p and d+Au collisions. From these two independent analyses, the differential cross section per nucleon-nucleon binary interaction at mid-rapidity for open charm production from d+Au collisions at RHIC is $d{\sigma }_{c\bar{c}}^{NN}/dy$=0.30$\pm$0.04 (stat.)$\pm$0.09(syst.) mb. The results are compared to theoretical calculations. Implications for charmoniumm results in A+A collisions are discussed.

6 pages, 4 figures

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