Measurement of open charm production in d+Au collisions at √sNN=200 GeV

被引：44
|
作者：
Tai, A [1 ]
机构：
[1] Univ Calif Los Angeles, Dept Phys, Los Angeles, CA 90095 USA
来源：
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS | 2004年 / 30卷 / 08期
关键词：
D O I：
10.1088/0954-3899/30/8/021
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
We present the first comprehensive measurement of D-0, D+, D*(+) and their charge conjugate states at mid-rapidity in d+Au collisions at roots(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 Do is 0.0265 +/- 0.0036 (stat.), +/- 0.0071 (syst.), and the measured D*(+)/D-0 and D+/D-0 ratios are approximately equal with a magnitude of 0.40 +/- 0.09 (stat.) +/- 0.13 (syst.). The total cc cross section per nucleon-nucleon collision extracted from this study is 1.18 +/- 0.21 (stat.) +/- 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.
引用
收藏
页码：S809 / S817
页数：9
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