arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1709.01565nucl-exhep-exhep-ph
收藏

PHENIX上p+p碰撞中能量相关的正向B $\rightarrow$ $J/ψ$测量

Energy dependent forward B $\rightarrow$ $J/ψ$ measurements in p+p collisions at PHENIX

Xuan Li

摘要:

RHIC的重味研究有助于提高底夸克/粲夸克产生的认识,并可以检验量子色动力学(QCD)。与LHC/Tevatron相比,RHIC重味产生源于不同的部分子过程,并具有互补的运动学覆盖范围。PHENIX前向快度硅顶点探测器(FVTX)可精确确定事件顶点、跟踪和带电轨道的最近接近距离(DCA)。该探测器允许通过测量在$\sqrt{s} = $ 510和200 GeV的$p$ + $p$碰撞中的$1.2<|y|<2.2$快度内的非瞬发$J/ψ\to μ^{+} + μ^{-}$来直接获得$B$介子的产生。PHENIX测量的$B \rightarrow J/ψ$分数与集成$J/ψ$ $p_{T}$高达5 GeV的$/c$和更高的能量结果在Tevatron和LHC之间的比较呈现出一个平滑的质心能量依赖性从0.2到13 TeV的$p$ + $p$($p$ + $\bar{p}$)碰撞。基于PHENIX的$B \rightarrow J/ψ$分数测量,用次首阶微扰QCD(NLO pQCD)方法计算了$b\bar{b}$的总截面,计算结果与理论计算结果吻合较好.

英文摘要:

The heavy flavor studies at RHIC help improve the knowledge of the bottom/charm quark production and can test Quantum Chromodynamics (QCD). Compared to the LHC/Tevatron, the RHIC heavy flavor production originates from different partonic sub-processes and has a complementary kinematic coverage. The PHENIX forward rapidity silicon vertex detector (FVTX) provides precise determination of the event vertex, tracking and the Distance of Closest Approach (DCA) of charged tracks. This detector allows direct access to the $B$ meson production via measurements of non-prompt $J/ψ\to μ^{+} + μ^{-}$ within $1.2<|y|<2.2$ rapidity in $p$+$p$ collisions at $\sqrt{s} = $ 510 and 200 GeV. Comparison among PHENIX measurements of the $B \rightarrow J/ψ$ fraction with integrated $J/ψ$ $p_{T}$ up to 5 GeV$/c$ and higher energy results at the Tevatron and the LHC presents a smooth center of mass energy dependence from 0.2 to 13 TeV in $p$+$p$ ($p$+$\bar{p}$) collisions. The Next-To-Leading order Perturbative QCD (NLO pQCD) calculations are in reasonable agreement with the extracted total $b\bar{b}$ cross section based on the $B \rightarrow J/ψ$ fraction measurements at PHENIX.

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。

↑