arXiv 1605.075692016-05nucl-exhep-ex

$\sqrt{s_{\rm NN}}=5.02$ TeV和$\sqrt{s}=7$ TeV pp碰撞中d介子的产生

D-meson production in p-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV and in pp collisions at $\sqrt{s}=7$ TeV

ALICE Collaboration

备注：: 43 pages, 17 captioned figures, 3 tables, authors from page 37, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/2711
发表信息：: Phys. Rev. C 94, 054908 (2016)
DOI：: 10.1103/PhysRevC.94.054908

摘要：

用ALICE探测器在LHC上测量了p-Pb碰撞中中快度下瞬发粲介子D $^0$，D $^+$，D $^{*+}$和D $_s$的产生截面，每个核子对的质心能量为$\sqrt{s_{\rm NN}}=5.02$ TeV. D介子由它们的衰变D $^0\rightarrow{\rm K}^-π^+$、D $^+\rightarrow{\rm K}^-π^+π^+$、D $^{*+}\rightarrow D^0π^+$、D $_s^+\rightarrowϕπ^+\rightarrow{\rm K}^-{\rm K}^+π^+$和它们的电荷共轭体重建。在中快度测量了$p_{\rm T}$ -微分产生截面，对于D $^0$，D $^+$和D $^{*+}$介子在$1<p_{\rm T}<24$ GeV/ $c$区间，对于D $_s$介子在$2<p_{\rm T}<12$ GeV/ $c$区间，使用基于从相互作用顶点位移的衰变拓扑选择的分析方法。在$-1.26<y_{\rm cms}<0.34$的质心系中，在三个$p_{\rm T}$区间测量了D $^0$、D $^+$和D $^{*+}$介子的产生截面随快度$y_{\rm cms}$的变化.此外，使用基于组合背景的估计和扣除的分析技术，在$\sqrt{s}=7$ TeV的pp碰撞和$\sqrt{s_{\rm NN}}=5.02$ TeV的p-Pb碰撞中测量了提示D $^0$横截面，而无需重建D $^0$衰变顶点。核修正因子$R_{\rm pPb}(p_{\rm T})$定义为p-Pb碰撞中的$p_{\rm T}$微分D介子截面与pp碰撞中的$p_{\rm T}$微分D介子截面之比，用Pb核的质量数标度，计算了四种D介子的核修正因子，发现在实验不确定性范围内，修正因子与1是相容的.结果进行了比较，包括冷核物质的影响和运输模型的计算，将相互作用的魅力夸克与一个不断扩大的decenfined介质的理论计算。

英文摘要：

The production cross sections of the prompt charmed mesons D$^0$, D$^+$, D$^{*+}$ and D$_s$ were measured at mid-rapidity in p-Pb collisions at a centre-of-mass energy per nucleon pair $\sqrt{s_{\rm NN}}=5.02$ TeV with the ALICE detector at the LHC. D mesons were reconstructed from their decays D$^0\rightarrow{\rm K}^-π^+$, D$^+\rightarrow{\rm K}^-π^+π^+$, D$^{*+}\rightarrow D^0π^+$, D$_s^+\rightarrowϕπ^+\rightarrow{\rm K}^-{\rm K}^+π^+$, and their charge conjugates. The $p_{\rm T}$-differential production cross sections were measured at mid-rapidity in the interval $1<p_{\rm T}<24$ GeV/$c$ for D$^0$, D$^+$ and D$^{*+}$ mesons and in $2<p_{\rm T}<12$ GeV/$c$ for D$_s$ mesons, using an analysis method based on the selection of decay topologies displaced from the interaction vertex. The production cross sections of the D$^0$, D$^+$ and D$^{*+}$ mesons were also measured in three $p_{\rm T}$ intervals as a function of the rapidity $y_{\rm cms}$ in the centre-of-mass system in $-1.26<y_{\rm cms}<0.34$. In addition, the prompt D$^0$ cross section was measured in pp collisions at $\sqrt{s}=7$ TeV and p-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV down to $p_{\rm T}=0$ using an analysis technique that is based on the estimation and subtraction of the combinatorial background, without reconstruction of the D$^0$ decay vertex. The nuclear modification factor $R_{\rm pPb}(p_{\rm T})$, defined as the ratio of the $p_{\rm T}$-differential D-meson cross section in p-Pb collisions and that in pp collisions scaled by the mass number of the Pb nucleus, was calculated for the four D-meson species and found to be compatible with unity within experimental uncertainties. The results are compared to theoretical calculations that include cold-nuclear-matter effects and to transport model calculations incorporating the interactions of charm quarks with an expanding deconfined medium.

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