Measurements of $D^0$ and $D^{\ast }$ Production in $p$ + $p$ Collisions at $\sqrt{s}$ = 200 GeV

Abstract

We report measurements of charmed-hadron ($D^0$, $D^{\ast }$) production cross sections at mid-rapidity in $p$ + $p$ collisions at a center-of-mass energy of 200 GeV by the STAR experiment. Charmed hadrons were reconstructed via the hadronic decays $D^0\to K^{-}{\pi }^{+}$, $D^{\ast +}\to D^0{\pi }^{+}\to K^{-}{\pi }^{+}{\pi }^{+}$ and their charge conjugates, covering the $p_T$ range of 0.6$-$2.0 GeV/$c$ and 2.0$-$6.0 GeV/$c$ for $D^0$ and $D^{\ast +}$, respectively. From this analysis, the charm-pair production cross section at mid-rapidity is $d\sigma /dy{|}_{y=0}^{c\bar{c}}$ = 170 $\pm$ 45 (stat.) ${}_{-59}^{+38}$ (sys.) $\mu$b. The extracted charm-pair cross section is compared to perturbative QCD calculations. The transverse momentum differential cross section is found to be consistent with the upper bound of a Fixed-Order Next-to-Leading Logarithm calculation.

15 pages, 16 figures. Revised version submitted to Phys. Rev. D

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• The total charm cross section
• High $p_T$ non-photonic electron production in $p$+$p$ collisions at $\sqrt{s}$ = 200 GeV

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