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Quarkonium production at the LHC: A data-driven analysis of remarkably simple experimental patterns

机译:大型强子对撞机的石英生产:数据驱动的非常简单的实验模式分析

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摘要

While non-relativistic QCD (NRQCD) foresees a variety of elementary quarkonium production mechanisms naturally leading to state-dependent kinematic patterns, the LHC cross sections and polarization measurements reveal a remarkably simple production scenario, independent of the quantum numbers and masses of the quarkonia. Surprisingly, NRQCD is able to accommodate the observed universal scenario, through a series of conspiring cancellations smoothing out its otherwise variegated hierarchy of mechanisms. This seemingly unnatural solution implies that the $\chi_{c1}$ and $\chi_{c2}$ polarizations, not yet measured, are strong and opposite, representing the only potential exception to a remarkably simple picture of quarkonium production. The observation of a large difference between $\chi_{c2}$ and $\chi_{c1}$ polarizations, which cannot be indirectly extracted from existing measurements because they mutually cancel each other in their contribution to the observed J/$\psi$ production, would be a smoking gun signal finally proving the multifaceted but mysteriously elusive structure of NRQCD. On the other hand, the measurement of two similar, small polarizations will urge improved P-wave calculations, if not a substantial revision of the NRQCD hierarchies.
机译:虽然非相对论性QCD(NRQCD)预见了自然导致状态依赖的运动学模式的各种基本的夸克产生机理,但LHC横截面和极化测量揭示了非常简单的生产场景,而与夸克的量子数和质量无关。出人意料的是,NRQCD通过一系列合谋的取消措施消除了原本多样化的机制层次结构,从而能够适应观察到的普遍情况。这种看似不自然的解决方案意味着尚未测量的$ \ chi_ {c1} $和$ \ chi_ {c2} $极化是强而相反的,代表了非常简单的水族馆生产情况的唯一潜在例外。观察到\\ chi_ {c2} $和$ \ chi_ {c1} $极化之间的巨大差异,这不能从现有的测量值中间接提取出来,因为它们相互抵消了对观测到的J / $ \ psi $的贡献最终将证明NRQCD的多面性但难以捉摸的结构。另一方面,如果不对NRQCD层次结构进行实质性修改,则对两个相似的小极化的测量将敦促改进P波计算。

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