Joint Institute for Nuclear Research, Dubna, Russia.
University of Oklahoma, Norman, Oklahoma 73019, USA.
Phys Rev Lett. 2016 Feb 26;116(8):082002. doi: 10.1103/PhysRevLett.116.082002. Epub 2016 Feb 25.
We report evidence for the simultaneous production of J/ψ and ϒ mesons in 8.1 fb^{-1} of data collected at sqrt[s]=1.96 TeV by the D0 experiment at the Fermilab pp[over ¯] Tevatron Collider. Events with these characteristics are expected to be produced predominantly by gluon-gluon interactions. In this analysis, we extract the effective cross section characterizing the initial parton spatial distribution, σ_{eff}=2.2±0.7(stat)±0.9(syst) mb.
我们报告了在费米实验室 Tevatron 对撞机上运行的 D0 实验,在 8.1 fb^{-1}的数据集(sqrt[s]=1.96 TeV)中,同时产生 J/ψ 和 ϒ 介子的证据。具有这些特征的事件预计主要由胶子-胶子相互作用产生。在这项分析中,我们提取了描述初始部分子空间分布特征的有效截面,σ_{eff}=2.2±0.7(stat)±0.9(syst) mb。