论文标题
$ \ sqrt {s _ {\ rm nn}} = 68.5 $ gev中的$ p $ ne碰撞中的charmonium生产
Charmonium production in $p$Ne collisions at $\sqrt{s_{\rm NN}}=68.5$ GeV
论文作者
论文摘要
提出了LHCB实验在其固定目标配置中对质子蛋白（$ p $ ne）碰撞产生的炭状态的测量。研究了$ j/ψ$和$ψ（2s）$介子的生产，剩余的2.5 TEV质子碰撞在静置的气态霓虹灯目标上，对应于核子 - 核子中心质量$ \ sqrt {s _ {s _ {\ rm nn}} = 68.5 $ gev。数据样本对应于$ 21.7 \ pm 1.4 $ nb $^{ - 1} $的集成光度。 $ J/ψ$和$ψ（2s）$ HADRON以$μ^+μ^ - $最终状态重建。在[-2.29，0] $ in [-2.29，0] $中，$ J/ψ$每个目标核的生产横截面$ y^{*} \在[-2.29，0] $中的$ 506 \ pm 8 \ pm 25 \ pm 25 \ textrm {nb/nucleon} $。 $ψ（2s）$至$ j/ψ$相对生产率为$（1.67 \ pm 0.27 \ pm 0.10）\％$与其他涉及相似尺寸的光束和目标核的测量值非常吻合。
The measurement of charmonium states produced in proton-neon ($p$Ne) collisions by the LHCb experiment in its fixed-target configuration is presented. The production of $J/ψ$ and $ψ(2S)$ mesons is studied with a beam of 2.5 TeV protons colliding on gaseous neon targets at rest, corresponding to a nucleon-nucleon centre-of-mass energy $\sqrt{s_{\rm NN}}=68.5$ GeV. The data sample corresponds to an integrated luminosity of $21.7\pm 1.4 $ nb$^{-1}$. The $J/ψ$ and $ψ(2S)$ hadrons are reconstructed in $μ^+μ^-$ final states. The $J/ψ$ production cross-section per target nucleon in the centre-of-mass rapidity range $y^{*}\in [-2.29, 0]$ is found to be $506 \pm 8 \pm 25 \textrm{ nb/nucleon}$. The $ψ(2S)$ to $J/ψ$ relative production rate is found to be $(1.67 \pm 0.27\pm 0.10)\%$ in good agreement with other measurements involving beam and target nuclei of similar sizes.
