LHC上若干带喷注过程的次次领头阶预言

W+charm-jet production and di-jet production at the Large Hadron Collider (LHC) have draw much attention from both the LHC phenomenology and experiments, due to their important impact on precision measurements and new physics searches. Current pQCD NLO results are usually plagued with large theoretical errors and hence gradually dissatisfy the experimental accuracy requirements and in some cases, they even fail to describe the LHC data correctly. Therefore it becomes one of the frontier problems at the LHC that how theoretical predictions can match the improving experimental accuracy and the abundant experimental methods. In this project, we aimed at the precision frontier at the LHC: we will perform full NNLO calculations for both W+charm-jet and di-jet production at the LHC; we will study the consequence of the NNLO results on explaining experimental phenomena, new physics searches, PDF fitting and LHC precision measurements. We will also publish NNLO Monte Carlo Event Generators out of our calculations to meet the needs from both the phenomenological studies and the experimental analyses.

大型强子对撞机（LHC）上的W-玻色子与粲喷注的产生以及双喷注的产生对于LHC精确测量和新物理搜索都有着非常重要的影响，因而受到LHC唯象研究和实验的普遍重视。当前基于微扰量子色动力学的次领头阶（NLO）的结果存在着较大的理论误差，因而逐渐无法满足实验精度的需求，有时甚至无法正确地描述实验结果。因此，理论预言如何匹配日益提升的实验精度和多样的实验手段，已成为LHC物理的前沿问题之一。本项目旨在探索LHC精度前沿：针对LHC上这两个过程，展开次次领头阶（NNLO）的完整计算。研究NNLO的结果对于解释实验现象、搜索新物理、拟合部分子分布函数以及LHC精确测量的影响，并发表相关的NNLO蒙特卡洛事例生成器以满足LHC唯象学研究和实验分析的需求。

本项目围绕着喷注之于对撞机唯象学的应用展开，涵盖了对于喷注亚结构的精确预言，还探索了用喷注解锁核子自旋结构以及小x物理唯象学精确预言的的可能性。更具体地，本项目首先对喷注经过soft drop清理过的质量、角度性以及喷注半径进行了次领头对数甚至次次领头对数的预言，显著地提升了理论预言的精度，并改善了理论与实验的对比一致性。获得的结果将会对利用喷注进行强耦合常数与部分子分布函数的精确测量产生积极的影响；其次本项目提出了利用喷注电荷来区分不同夸克种类对质子自旋的贡献引起实验物理学家的浓厚兴趣，并建立了小x物理中，精确计算的理论框架，解决了小x物理中长期以来的负截面问题。