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arXiv 1405.3452nucl-exhep-ex
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$\sqrt{s_{\rm NN}}$ = 5.02 TeV p-Pb碰撞中D介子瞬发产生的测量

Measurement of prompt D-meson production in p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV

ALICE Collaboration

备注：
15 pages, 4 captioned figures, authors from page 10, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/1525
发表信息：
Phys. Rev. Lett. 113 (2014) 232301
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摘要：

在LHC上用ALICE探测器测量了质心能量为$\sqrt{s_{\rm NN}} = 5.02$ TeV的p-Pb碰撞中，瞬发粲介子$D^0$，$D^+$，$D^{*+}$和$D_{\rm s}^{+}$及其电荷共轭在快度区间$-0.96 < y_{\rm cms} < 0.04$的$p_{\rm T}$ -微分产生截面.核修正因子$R_{\rm pPb}$，量化了p-Pb碰撞中D介子产额相对于pp碰撞中的产额的比值，并与横动量间隔$1 < p_{\rm T} < 24$ GeV/ $c$中的单位值在15-20%的不确定度范围内是相容的。四种D介子的$R_{\rm pPb}$之间没有显著差异。结果描述的不确定性内的理论计算，包括初始状态的影响。测量增加了实验证据表明，修改的D介子的动量谱中观察到的Pb-Pb碰撞相对于pp碰撞是由于强的末态效应引起的热部分子物质。

英文摘要：

The $p_{\rm T}$-differential production cross sections of the prompt charmed mesons $D^0$, $D^+$, $D^{*+}$ and $D_{\rm s}^{+}$ and their charge conjugate in the rapidity interval $-0.96 < y_{\rm cms} < 0.04$ were measured in p-Pb collisions at a centre-of-mass energy $\sqrt{s_{\rm NN}} = 5.02$ TeV with the ALICE detector at the LHC. The nuclear modification factor $R_{\rm pPb}$, quantifying the D-meson yield in p-Pb collisions relative to the yield in pp collisions scaled by the number of binary nucleon-nucleon collisions, is compatible within the 15-20% uncertainties with unity in the transverse momentum interval $1 < p_{\rm T} < 24$ GeV/$c$. No significant difference among the $R_{\rm pPb}$ of the four D-meson species is observed. The results are described within uncertainties by theoretical calculations that include initial-state effects. The measurement adds experimental evidence that the modification of the momentum spectrum of D mesons observed in Pb-Pb collisions with respect to pp collisions is due to strong final-state effects induced by hot partonic matter.

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