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arXiv 2108.01906nucl-exhep-ex
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在$\sqrt{s}~=~13$ TeV pp碰撞中在中快度时J/ $ψ$的产生

Inclusive J/$ψ$ production at midrapidity in pp collisions at $\sqrt{s}~=~13$ TeV

ALICE Collaboration

备注：
25 pages, 4 captioned figures, 1 table, authors from page 19, published version, figures at http://alice-publications.web.cern.ch/node/7300
发表信息：
Eur. Phys. J. C 81 (2021) 1121
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摘要：

我们报告的包容性J/ $ψ$生产截面测量在欧洲核子研究中心大型强子对撞机在质子-质子碰撞在质心能量$\sqrt{s}~=~13$ TeV。J/ $ψ$介子在$\rm e^{+} e^{-}$衰变通道中重建，并在横向动量间隔$0< p_{\rm T} <40$ GeV/ $c$中的中快度（$|y|<0.9$）下进行测量，使用对应于积分亮度$L_{\text{int}} = 32.2~\text{nb}^{-1}$的最小偏差数据样本和电磁量热计触发的数据样本与$L_{\text{int}} = 8.3~\mathrm{pb}^{-1}$。用最小偏差数据样本计算的中快度$p_{\rm T}$积分J/ $ψ$产生截面为$\text{d}σ/\text{d}y|_{y=0} = 8.97\pm0.24~(\text{stat})\pm0.48~(\text{syst})\pm0.15~(\text{lumi})~μ\text{b}$。这些结果和现有的世界数据表明，与碰撞能量的近似对数依赖关系，与模型预测一致。积分和$p_{\rm T}$ -差分测量进行了比较，在PP碰撞在较低的能量和最近的几个唯象计算的基础上的非相对论QCD和颜色蒸发模型的测量。

英文摘要：

We report on the inclusive J/$ψ$ production cross section measured at the CERN Large Hadron Collider in proton-proton collisions at a centre-of-mass energy $\sqrt{s}~=~13$ TeV. The J/$ψ$ mesons are reconstructed in the $\rm e^{+} e^{-}$ decay channel and the measurements are performed at midrapidity ($|y|<0.9$) in the transverse-momentum interval $0< p_{\rm T} <40$ GeV/$c$, using a minimum-bias data sample corresponding to an integrated luminosity $L_{\text{int}} = 32.2~\text{nb}^{-1}$ and an Electromagnetic Calorimeter triggered data sample with $L_{\text{int}} = 8.3~\mathrm{pb}^{-1}$. The $p_{\rm T}$-integrated J/$ψ$ production cross section at midrapidity, computed using the minimum-bias data sample, is $\text{d}σ/\text{d}y|_{y=0} = 8.97\pm0.24~(\text{stat})\pm0.48~(\text{syst})\pm0.15~(\text{lumi})~μ\text{b}$. An approximate logarithmic dependence with the collision energy is suggested by these results and available world data, in agreement with model predictions. The integrated and $p_{\rm T}$-differential measurements are compared with measurements in pp collisions at lower energies and with several recent phenomenological calculations based on the non-relativistic QCD and Color Evaporation models.

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