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arXiv 2108.02523nucl-exhep-ex
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$\sqrt{s}$ = 5.02和13 TeV质子-质子碰撞中中快度时的瞬发和非瞬发J/ $ψ$产生截面

Prompt and non-prompt J/$ψ$ production cross sections at midrapidity in proton-proton collisions at $\sqrt{s}$ = 5.02 and 13 TeV

ALICE Collaboration

备注：
31 pages, 6 captioned figures, 2 tables, authors from page 25, published version, figures at http://alice-publications.web.cern.ch/node/7315
发表信息：
JHEP 03 (2022) 190
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摘要：

J/ $ψ$的产生是在$\sqrt{s}$ = 5.02和13 TeV的质子-质子碰撞中，通过双电子衰变通道，使用大型强子对撞机的ALICE探测器测量的。用于分析的数据集对应于积分光度的$\mathcal{L}_{\rm int}$ = 19.4 $\pm$ 0.4 nb $^{-1}$和$\mathcal{L}_{\rm int}$ = 32.2 $\pm$ 0.5 nb $^{-1}$在$\sqrt{s}$ = 5.02和13 TeV，分别。在$\sqrt{s}$ = 5.02 TeV（13 TeV）时，测量到横动量$p_{\rm T}$ = 2 GeV/ $c$（1 GeV/ $c$）的非瞬发J/ $ψ$介子的分数，即那些起源于美强子衰变的介子。分别计算了瞬发和非瞬发J/ $ψ$介子的$p_{\rm T}$和快度（$y$）微分截面，以及在$p_{\rm T}$和$y$上积分的相应值.结果与其他实验测量和基于量子色动力学（QCD）的理论计算进行了比较。利用微扰QCD模型预测的美夸克的$p_{\rm T}$和$y$分布的形状外推中快度和全相空间中的$\rm b\overline{b}$对截面。在$\sqrt{s}$ = 13和5.02 TeV时，总的$\rm b\overline{b}$截面分别为$σ_{\rm b \overline{\rm b}} = 541 \pm 45 (\rm stat.) \pm 69 (\rm syst.)_{-12}^{+10} (\rm extr.)~{\rm μb}$和$σ_{\rm b \overline{\rm b}}~=~218 \pm 37 (\rm stat.) \pm 31 (\rm syst.)_{-9.1}^{+8.2} (\rm extr.)~{\rm μb}$.还提供了在$\sqrt{s}$ = 13 TeV的pp碰撞中从ALICE和LHCb测量的组合获得的值。

英文摘要：

The production of J/$ψ$ is measured at midrapidity ($|y|<0.9$) in proton-proton collisions at $\sqrt{s}$ = 5.02 and 13 TeV, through the dielectron decay channel, using the ALICE detector at the Large Hadron Collider. The data sets used for the analyses correspond to integrated luminosities of $\mathcal{L}_{\rm int}$ = 19.4 $\pm$ 0.4 nb$^{-1}$ and $\mathcal{L}_{\rm int}$ = 32.2 $\pm$ 0.5 nb$^{-1}$ at $\sqrt{s}$ = 5.02 and 13 TeV, respectively. The fraction of non-prompt J/$ψ$ mesons, i.e. those originating from the decay of beauty hadrons, is measured down to a transverse momentum $p_{\rm T}$ = 2 GeV/$c$ (1 GeV/$c$) at $\sqrt{s}$ = 5.02 TeV (13 TeV). The $p_{\rm T}$ and rapidity ($y$) differential cross sections, as well as the corresponding values integrated over $p_{\rm T}$ and $y$, are carried out separately for prompt and non-prompt J/$ψ$ mesons. The results are compared with measurements from other experiments and theoretical calculations based on quantum chromodynamics (QCD). The shapes of the $p_{\rm T}$ and $y$ distributions of beauty quarks predicted by state-of-the-art perturbative QCD models are used to extrapolate an estimate of the $\rm b\overline{b}$ pair cross section at midrapidity and in the total phase space. The total $\rm b\overline{b}$ cross sections are found to be $σ_{\rm b \overline{\rm b}} = 541 \pm 45 (\rm stat.) \pm 69 (\rm syst.)_{-12}^{+10} (\rm extr.)~{\rm μb}$ and $σ_{\rm b \overline{\rm b}}~=~218 \pm 37 (\rm stat.) \pm 31 (\rm syst.)_{-9.1}^{+8.2} (\rm extr.)~{\rm μb}$ at $\sqrt{s}$ = 13 and 5.02 TeV, respectively. The value obtained from the combination of ALICE and LHCb measurements in pp collisions at $\sqrt{s}$ = 13 TeV is also provided.

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