arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1012.3257hep-ex
收藏

LHC上$\sqrt{s}=0.9$ TeV与ALICE质子-质子碰撞中奇异粒子的产生

Strange particle production in proton-proton collisions at $\sqrt{s}=0.9$ TeV with ALICE at the LHC

ALICE Collaboration

摘要:

利用ALICE实验,在LHC上测量了$\sqrt{s}$ = 0.9 TeV pp碰撞中心快度下含奇异夸克(KPDMATHABMM,$ϕ$)和单奇异重子($Λ$,Anti- $Λ$,$Ξ$ +Anti- $Ξ$)的介子产生.结果是从2009年记录的约250 k最小偏差事件的分析中获得的。测量了pp非弹性碰撞的产额(dN/dy)和中心快度处的横动量谱。对于介子,我们报告的产额(<dN/dy>)为0.184 $\pm$ 0.002 stat。K $^0_s$的$\pm$ 0.006系统和0.021 $\pm$ 0.004统计。$\pm$ 0.003系统用于$ϕ$。对于重子,我们发现<dN/dy> = 0.048 $\pm$ 0.001 stat。$\pm$ 0.004系统,用于$Λ$,0.047 $\pm$ 0.002统计。$\pm$ 0.005系统抗$Λ$和0.0101 $\pm$ 0.0020统计。$\pm$ 0.0009系统,用于$Ξ$ +抗$Ξ$。结果还比较了从QCD启发的模型确定的粒子光谱的预测,并提供了一个基线与未来的PP测量在更高的能量和重离子碰撞的比较。

英文摘要:

The production of mesons containing strange quarks (K$^0_s$, $ϕ$) and both singly and doubly strange baryons ($Λ$, Anti-$Λ$, and $Ξ$+Anti-$Ξ$) are measured at central rapidity in pp collisions at $\sqrt{s}$ = 0.9 TeV with the ALICE experiment at the LHC. The results are obtained from the analysis of about 250 k minimum bias events recorded in 2009. Measurements of yields (dN/dy) and transverse momentum spectra at central rapidities for inelastic pp collisions are presented. For mesons, we report yields (<dN/dy>) of 0.184 $\pm$ 0.002 stat. $\pm$ 0.006 syst. for K$^0_s$ and 0.021 $\pm$ 0.004 stat. $\pm$ 0.003 syst. for $ϕ$. For baryons, we find <dN/dy> = 0.048 $\pm$ 0.001 stat. $\pm$ 0.004 syst. for $Λ$, 0.047 $\pm$ 0.002 stat. $\pm$ 0.005 syst. for Anti-$Λ$ and 0.0101 $\pm$ 0.0020 stat. $\pm$ 0.0009 syst. for $Ξ$+Anti-$Ξ$. The results are also compared with predictions for identified particle spectra from QCD-inspired models and provide a baseline for comparisons with both future pp measurements at higher energies and heavy-ion collisions.

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。

↑