Open charm hadron measurement in p+p and Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV in STAR

Abstract

We present the measurements of $D^0$ and $D^{\ast }$ in p+p and $D^0$ in Au+Au collisions via hadronic decays $D^0\to K^{-}{\pi }^{+}$, $D^{\ast +}\to D^0{\pi }^{+}\to K^{-}{\pi }^{+}{\pi }^{+}$ in mid-rapidity $|y|<1$ at $\sqrt{s_{{}_{\mathrm{NN}}}}$ = 200 GeV, covering $p_T$ from 0.2 to 6 GeV/$c$ in p+p and 0.4 to 5 GeV/$c$ in Au+Au, respectively. The charm pair production cross section per nucleon-nucleon collision at mid rapidity is measured to be 202 $\pm$ 56 (stat.) $\pm$ 40 (sys.) $\pm$ 20 (norm.) $\mu$b in p+p and 186 $\pm$ 22 (stat.) $\pm$ 30 (sys.) $\pm$ 18 (norm.) $\mu$b in Au+Au minimum bias collisions. The number of binary collisions scaling of charm cross section indicates that charm is produced via initial hard scatterings. No suppression of $D^0$ $R_{AA}$ in Au+Au 0-80% minbias collisions is observed at $p_T$ below 3 GeV/$c$. Blast-wave predictions with light-quark hadron parameters are different from data, which may indicate that $D^0$ decouples earlier from the medium than the light-quark hadrons.

4 pages, Quark Matter 2011 proceedings

References in corpus (3)

• Systematic Measurements of Identified Particle Spectra in pp, d+Au and Au+Au Collisions from STAR
• Measurement of high-p_T Single Electrons from Heavy-Flavor Decays in p+p Collisions at sqrt(s) = 200 GeV
• The total charm cross section

Cited by in corpus (5)

• ${\mathbf{D}}_{\mathbf{s}}$-Meson as Quantitative Probe of Diffusion and Hadronization in Nuclear Collisions
• Narrowing the uncertainty on the total charm cross section and its effect on the J/ψ cross section
• Highlights from STAR
• Charm and Bottom Hadrons in Hot Hadronic Matter
• The high energy frontier of ultrarelativistic nucleus-nucleus collisions