Measurement of open charm production in $d$+Au collisions at $\sqrt{s_{NN}}$=200 GeV

Abstract

We present the first comprehensive measurement of $D^0,D^{+},D^{\ast +}$ and their charge conjugate states at mid-rapidity in $d$+Au collisions at $\sqrt{s_{{}_{NN}}}$=200 GeV using the STAR TPC. The directly measured open charm multiplicity distribution covers a broad transverse momentum region of 0$<p_T<11$ GeV/$c$. The measured $dN/dy$ at mid-rapidity for $D^0$ is $0.0265\pm 0.0036(stat.)\pm 0.0071(syst.)$ and the measured $D^{\ast +}/D^0$ and $D^{+}/D^0$ ratios are approximately equal with a magnitude of $0.40\pm 0.09(stat.)\pm 0.13(syst.)$. The total $c\bar{c}$ cross section per nucleon-nucleon collision extracted from this study is $1.18\pm 0.21(stat.)\pm 0.39(syst.)$mb. The direct measurement of open charm production is consistent with STAR single electron data. This cross section is higher than expectations from PYTHIA and other pQCD calculations. The measured $p_T$ distribution is harder than the pQCD prediction using the Peterson fragmentation function.

Quark Matter 2004 Proceedings

References in corpus (2)

• Open Charm Yields in 200 GeV p+p and d+Au Collisions at RHIC
• High-$p_T$ electron distributions in d+Au and p+p collisions at RHIC

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