Midrapidity open charm spectra from direct reconstruction of D0(D0)→Kπ± in d+Au collisions and indirect electron-positron measurements via charm semileptonic decays in p+p and d+Au collisions at √sNN=200  GeV are reported. The D0(D0) spectrum covers a transverse momentum (pT) range of 0.1T<3  GeV/c, whereas the electron spectra cover a range of 1T<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 midrapidity for open charm production from d+Au collisions at BNL RHIC is dσNNc¯c/dy=0.30±0.04(stat)±0.09(syst)   mb. The results are compared to theoretical calculations. Implications for charmonium results in A+A collisions are discussed.



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NOTE: At the time of publication, the author Thomas Gutierrez was not yet affiliated with Cal Poly.

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