arXiv 1012.05532010-12-02hep-phhep-th

LHC上的QCD物理学新观点

New Perspectives for QCD Physics at the LHC

Stanley J. Brodsky

备注：: Invited talk, presented at the 5th Workshop on High P_T Physics at the LHC held at the Instituto de Ciencias Nucleares of the Universidad National Automata de Mexico in Mexico City, September 27-October 1, 2010
发表信息：: AIP Conf.Proc.1348:11-34,2011
DOI：: 10.1063/1.3579428

摘要：

我回顾了一些主题，在LHC强子物理相关的传统智慧受到了挑战。例如，夸克和胶子的初态和终态相互作用进入微扰QCD硬散射子过程导致了传统的因子分解和普适性概念的崩溃的横动量相关的观测量在领先的扭曲。这些软胶子再散射效应产生了单自旋不对称性、Drell-Yan反应中Lam-Tung关系的破坏以及衍射深度非弹性散射。预测了原子核结构函数的反阴影依赖于每个夸克和反夸克的味量子数。孤立的强子可以直接在硬的高扭QCD子过程中以大的横动量产生，而不是从喷流碎裂中产生，即使在LHC中也是如此。这样的“直接”过程可以解释观测到的偏离pQCD预测的幂律下降的包容性强子截面，以及“重子异常”中看到的高中心性重离子碰撞在RHIC。内禀粲对高x下质子结构函数的贡献可以解释Tevatron上观察到的高p_T光子加粲喷流事件的大速率，暗示LHC上高p_T下粲喷流和底喷流的大产生速率，以及高x_F下Higgs和Z^0产生的新机制。在AdS/QCD中导出的光波前波函数可以用来计算振幅水平上的喷注强子化。使用与方案无关的BLM方法消除QCD耦合的重整化标度模糊性将增加在LHC上寻找新物理的灵敏度。文中还讨论了“内强子凝聚”对QCD对宇宙学常数贡献的意义。

英文摘要：

I review a number of topics where conventional wisdom relevant to hadron physics at the LHC has been challenged. For example, the initial-state and final-state interactions of the quarks and gluons entering perturbative QCD hard-scattering subprocesses lead to the breakdown of traditional concepts of factorization and universality for transverse-momentum-dependent observables at leading twist. These soft-gluon rescattering effect produce single-spin asymmetries, the breakdown of the Lam-Tung relation in Drell-Yan reactions, as well as diffractive deep inelastic scattering, The antishadowing of nuclear structure functions is predicted to depend on the flavor quantum numbers of each quark and antiquark. Isolated hadrons can be produced at large transverse momentum directly within a hard higher-twist QCD subprocess, rather than from jet fragmentation, even at the LHC. Such "direct" processes can explain the observed deviations from pQCD predictions of the power-law fall-off of inclusive hadron cross sections as well as the "baryon anomaly" seen in high-centrality heavy-ion collisions at RHIC. The intrinsic charm contribution to the proton structure function at high x can explain the large rate for high p_T photon plus charm-jet events observed at the Tevatron and imply a large production rate for charm and bottom jets at high p_T at the LHC, as well as a novel mechanism for Higgs and Z^0 production at high x_F. The light-front wavefunctions derived in AdS/QCD can be used to calculate jet hadronization at the amplitude level. The elimination of the renormalization scale ambiguity for the QCD coupling using the scheme-independent BLM method will increase the sensitivity of searches for new physics at the LHC. The implications of "in-hadron condensates" for the QCD contribution to the cosmological constant are also discussed.

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