论文标题
$ p + P $和$ p + D $互动的charmonium生产的测量
Measurement of Charmonium Production in $p + p$ and $p + d$ Interactions in the Fermilab SeaQuest Experiment
论文作者
论文摘要
Fermilab Seaquest实验从120GEV质子束在液体氢和氘靶上的相互作用中测量了Dimuon事件，二酮质量在2到9GEV之间。这些Dimuon事件既包含Drell-Yan流程，又包含Charmonium（$ J/ψ$和$ψ^\ Prime $）的生产。与探测核中古quark分布的DREL-YAN工艺不同，炭的产生对夸克和Gluon分布都很敏感。 Seaquest提取了$σ^{pd}/2σ^{pp} $比例以及在运动区域的charmonioum生产的微分横截面$ 0.4 <x_f <0.9 $。 $σ^{pd}/2σ^{pp} $比率与drell-yan过程的比率显着不同。比较了使用颜色蒸发模型和非相关QCD模型的理论计算，将测得的差异横截面与理论计算进行了比较。
The Fermilab SeaQuest experiment has measured dimuon events from the interactions of 120GeV proton beam on liquid hydrogen and deuterium targets with dimuon mass between 2 and 9GeV. These dimuon events contain both the Drell-Yan process and the charmonium ($J/ψ$ and $ψ^\prime$) production. Unlike the Drell-Yan process which probes the antiquark distributions in the nucleons, the charmonium production is sensitive to both quark and gluon distributions. SeaQuest has extracted the $σ^{pd}/2σ^{pp}$ ratio as well as the differential cross sections for charmonium production in the kinematic region of $0.4 < x_F < 0.9$. The $σ^{pd}/2σ^{pp}$ ratio for charmonium production are found to be significantly different from that of the Drell-Yan process. The measured differential cross sections for charmonium production are compared with theoretical calculations using Color Evaporation Model and Non-Relativistic QCD model.
