Abstract
Open charm spectra at mid-rapidity from direct reconstruction of D0 → Kπ and indirect electron/positron measurements via charm semileptonic decay in p+p and d+Au collisions at are reported. The combined spectra cover open charm transverse momentum range 0.1 ⪅ pT ⪅ 6 GeV/c. The electron spectra show approximate binary scaling between p+p and d+Au collisions. From these two independent analyses, the differential cross section per nucleon–nucleon interaction at mid-rapidity for open charm production at RHIC is (syst) mb. The next-to-leading-order pQCD calculation underpredicts the charm yields.
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