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arXiv 1105.0380hep-ex
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$\sqrt{s} = 7$ TeV pp碰撞中J/ $ψ$产生的速度和横动量依赖性

Rapidity and transverse momentum dependence of inclusive J/$ψ$ production in pp collisions at $\sqrt{s} = 7$ TeV

ALICE Collaboration

摘要:

大型强子对撞机的ALICE实验研究了在$\sqrt{s} = 7$ TeV的pp碰撞中中心和前向快度下J/ $ψ$的产生。在这封信中,我们报告了在快度范围|y| <0.9和2.5<y<4内,通过双轻子衰变成$e^+e^-$和$μ^+μ^-$对,探测J/ $ψ$所获得的第一批结果,接收度低至零$p_{\rm T}$。在双电子通道中,对对应于积分光度$L_{\rm int}$ = 5.6 nb $^{-1}$的数据样本进行分析,并且信号事件的数量为$N_{J/ψ}=352 \pm 32$(stat.)$\pm$ 28(系统);在双μ子通道中相应的数字是$L_{\rm int}$ = 15.6 nb $^{-1}$和$N_{J/ψ} = 1924 \pm 77$(stat.)$\pm$ 144(系统)。测得的生产截面为$σ_{J/ψ}$(|y| <0.9)= 12.4 $\pm$ 1.1(stat.)$\pm$ 1.8(系统)+ 1.8 - 2.7(系统极性)$μ$ b和$σ_{J/ψ}$(2.5<y<4)= 6.31 $\pm$ 0.25(统计学)$\pm$ 0.76(系统)+0.95 -1.96(系统极性)$μ$ b.还测量了J/ $ψ$的横动量和快度微分截面。

英文摘要:

The ALICE experiment at the LHC has studied inclusive J/$ψ$ production at central and forward rapidities in pp collisions at $\sqrt{s} = 7$ TeV. In this Letter, we report on the first results obtained detecting the J/$ψ$ through its dilepton decay into $e^+e^-$ and $μ^+μ^-$ pairs in the rapidity range |y|<0.9 and 2.5<y<4, respectively, and with acceptance down to zero $p_{\rm T}$. In the dielectron channel the analysis was carried out on a data sample corresponding to an integrated luminosity $L_{\rm int}$ = 5.6 nb$^{-1}$ and the number of signal events is $N_{J/ψ}=352 \pm 32$ (stat.) $\pm$ 28 (syst.); the corresponding figures in the dimuon channel are $L_{\rm int}$ = 15.6 nb$^{-1}$ and $N_{J/ψ} = 1924 \pm 77$ (stat.) $\pm$ 144(syst.). The measured production cross sections are $σ_{J/ψ}$ (|y|<0.9) = 12.4 $\pm$ 1.1 (stat.) $\pm$ 1.8 (syst.) + 1.8 -2.7 (syst.pol.) $μ$b and $σ_{J/ψ}$ (2.5<y<4) = 6.31 $\pm$ 0.25 (stat.) $\pm$ 0.76 (syst.) +0.95 -1.96 (syst.pol.) $μ$b. The differential cross sections, in transverse momentum and rapidity, of the J/$ψ$ were also measured.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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