Abstract
We present the measurements of D0 and D* in p+p and D0 in Au+Au collisions via hadronic decays D0 → K−π+, D*+ → D0π+ → K−π+π+ in mid-rapidity |y| < 1 at = 200 GeV, covering pT 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 ± 56 (stat.) ± 40 (sys.) ± 20 (norm.) μb in p+p and 186 ± 22 (stat.) ± 30 (sys.) ± 18 (norm.) μb 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 D0 RAA in Au+Au 0–80% minbias collisions is observed at pT below 3 GeV/c. Blast-wave predictions with light-quark hadron parameters are different from data, which may indicate that D0 decouples earlier from the medium than the light-quark hadrons.
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