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arXiv 1901.07979nucl-exhep-ex
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在$\mathbf{\sqrt{\textit s}~=~5.02~TeV}$与ALICE的pp碰撞中测量${\rm D^0}$、${\rm D^+}$、${\rm D^{*+}}$和${{\rm D^+}_s}$的产生

Measurement of ${\rm D^0}$, ${\rm D^+}$, ${\rm D^{*+}}$ and ${{\rm D^+}_s}$ production in pp collisions at $\mathbf{\sqrt{\textit s}~=~5.02~TeV}$ with ALICE

Alice Collaboration

摘要:

本文报道了在大型强子对撞机(LHC)上用ALICE探测器测量了在$\sqrt{s}=5.02$ TeV质子-质子(pp)碰撞中产生的瞬发${\rm D^0}$、${\rm D^+}$、${\rm D^{*+}}$和${{\rm D^+}_s}$介子。通过强子衰变通道${\rm D}^0 \to {\rm K}^-π^+$、${\rm D}^+\to {\rm K}^-π^+π^+$、${\rm D}^{*+} \to {\rm D}^0 π^+ \to {\rm K}^- π^+ π^+$、${\rm D^{+}_{s}\to ϕπ^+\to K^{+} K^{-} π^{+}}$和它们的电荷共轭,在中快度($|y|<0.5$)重建了D介子.在横向动量间隔$0<p_{\rm T}<36~\mathrm{GeV}/c$中测量了${\rm D^0}$的产生截面,在$1<p_{\rm T}<36~\mathrm{GeV}/c$中测量了${\rm D^+}$和${\rm D^{*+}}$的产生截面,在$2<p_{\rm T}<24~\mathrm{GeV}/c$中测量了${{\rm D^+}_s}$介子的产生截面。由于更高的积分光度,在更精细的$p_{\rm T}$箱相对于以前的测量在$\sqrt{s}=7$ TeV进行了分析,允许更详细地描述横截面$p_{\rm T}$形状。测量的$p_{\rm T}$ -差分生产截面相比,在$\sqrt{s}=7$ TeV的结果和四个不同的微扰QCD计算。结合ALICE和LHCb的测量在PP碰撞$\sqrt{s}=5.02$ TeV的快度依赖性也进行了测试。这种测量将允许在相同的核子-核子质心能量下进行的p-Pb和Pb-Pb碰撞中更准确地确定核修改因子。

英文摘要:

The measurements of the production of prompt ${\rm D^0}$, ${\rm D^+}$, ${\rm D^{*+}}$, and ${{\rm D^+}_s}$ mesons in proton--proton (pp) collisions at $\sqrt{s}=5.02$ TeV with the ALICE detector at the Large Hadron Collider (LHC) are reported. D mesons were reconstructed at mid-rapidity ($|y|<0.5$) via their hadronic decay channels ${\rm D}^0 \to {\rm K}^-π^+$, ${\rm D}^+\to {\rm K}^-π^+π^+$, ${\rm D}^{*+} \to {\rm D}^0 π^+ \to {\rm K}^- π^+ π^+$, ${\rm D^{+}_{s}\to ϕπ^+\to K^{+} K^{-} π^{+}}$, and their charge conjugates. The production cross sections were measured in the transverse momentum interval $0<p_{\rm T}<36~\mathrm{GeV}/c$ for ${\rm D^0}$, $1<p_{\rm T}<36~\mathrm{GeV}/c$ for ${\rm D^+}$ and ${\rm D^{*+}}$, and in $2<p_{\rm T}<24~\mathrm{GeV}/c$ for ${{\rm D^+}_s}$ mesons. Thanks to the higher integrated luminosity, an analysis in finer $p_{\rm T}$ bins with respect to the previous measurements at $\sqrt{s}=7$ TeV was performed, allowing for a more detailed description of the cross-section $p_{\rm T}$ shape. The measured $p_{\rm T}$-differential production cross sections are compared to the results at $\sqrt{s}=7$ TeV and to four different perturbative QCD calculations. Its rapidity dependence is also tested combining the ALICE and LHCb measurements in pp collisions at $\sqrt{s}=5.02$ TeV. This measurement will allow for a more accurate determination of the nuclear modification factor in p-Pb and Pb-Pb collisions performed at the same nucleon-nucleon centre-of-mass energy.

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