发表机构
University of Rochester; Seoul National University(罗切斯特大学; 首尔大学)
机构由 AI 辅助整理,请以论文原文为准。AI 中文总结
本文利用POWHEG-minnlops生成器,在13 TeV质子-质子碰撞中,研究不同产生过程(夸克-反夸克、夸克-胶子、胶子-胶子)下Z玻色子衰变轻子角分布及角系数A0和A2的差异,并提出实验探测方案。
AI 中文摘要
大型强子对撞机(LHC)上Z玻色子衰变轻子角分布的测量在QCD研究和电弱精密测量中具有重要意义。在LHC上,Z玻色子的产生主要由夸克-胶子过程主导,而夸克-反夸克过程仅占截面的40%。我们利用POWHEG-minnlops事件生成器,研究了通过夸克-反夸克、夸克-胶子和胶子-胶子过程产生的$pp \to \gamma^{*}/Z \to \ell^+\ell^-$($\mu^+\mu^-$或$e^{+}e^{-}$)事件角分布差异的理论预言。该研究针对大型强子对撞机(LHC)上质心能量$\sqrt{s} = 13$ TeV的质子-质子碰撞。我们研究了不同过程中角系数$A_0$和$A_2$(对应于Collins-Soper坐标系中的$\theta_{CS}$和$\phi_{CS}$分布)随Z玻色子快度、横动量和末态喷注多重性的变化,并提出了在LHC上对这些差异进行实验研究的方案。
英文摘要
Measurements of the angular distributions of Z boson-decay leptons at the Large Hadron Collider (LHC) are of interest in QCD studies and precision electroweak measurements. Z boson production at the LHC is dominated by quark-gluon processes and the quark-antiquark process accounts for only 40\% of the cross section. We investigate the theoretical predictions (using the POWHEG-minnlops event generator) for the difference in the angular distributions of $ pp \to γ^{*}/Z \to \ell^+\ell^-$ ($ μ^+μ^-$ or $e^{+}e^{-}$) events produced via quark-antiquark, quark-gluon , and gluon-gluon processes. The study is done for proton-proton collisions at the Large Hadron Collider (LHC) at $\sqrt{s} = 13$ TeV. We investigate the angular coefficients $A_0$ and $A_2$ (for $θ_{CS}$ and $ϕ_{CS}$ distributions in the Collins-Soper frame) for the different processes as a function of the Z boson rapidity, transverse momentum and final state jet multiplicity, and propose how these can be investigated experimentally at the LHC.
Comments10 pages, 8 figures, submitted to Phys. Rev. D