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From identical S- and P-wave ... formula ... spectra to maximally distinct polarizations: probing NRQCD with ... formula ... states

机译：从相同的S和P波...公式光谱到最大不同的极化：用...公式...状态探测NRQCD

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A global analysis of ATLAS and CMS measurements reveals that, at mid-rapidity, the directly-produced χc1, χc2 and J/ψ mesons have differential cross sections of seemingly identical shapes, when presented as a function of the mass-rescaled transverse momentum, pT/M. This identity of kinematic behaviours among S- and P-wave quarkonia is certainly not a natural expectation of non-relativistic QCD (NRQCD), where each quarkonium state is supposed to reflect a specific family of elementary production processes, of significantly different pT-differential cross sections. Remarkably, accurate kinematic cancellations among the various NRQCD terms (colour singlets and octets) of its factorization expansion can lead to a surprisingly good description of the data. This peculiar tuning of the NRQCD mixtures leads to a clear prediction regarding the χc1 and χc2 polarizations, the only observables not yet measured: they should be almost maximally different from one another, and from the J/ψ polarization, a striking exception in the global panorama of quarkonium production. Measurements of the difference between the χc1, χc2 and J/ψ polarizations, complementing the observed identity of momentum dependences, represent a decisive probe of NRQCD.
机译：对ATLAS和CMS测量的全局分析表明，在中等快速度时，直接产生的 χ c 1 ，<数学xmlns ：mml =“ http://www.w3.org/1998/Math/MathML” id =“ M8”溢出=“ scroll”> χ c < / mi> 2 和J / ψ 介子当作为质量重新缩放的横向动量的函数呈现时，它们的横截面看似相同， p T / M 。横波和纵波Quarkonia之间运动学行为的这种认同当然不是非相对论性QCD（NRQCD）的自然期望，在这种情况下，每个Quarkonium状态都应反映特定的基本生产过程族，而 p T -微分截面。值得注意的是，其分解扩展的各种NRQCD术语（颜色单峰和八位字节）之间的精确运动学抵消可以导致数据出乎意料的良好描述。 NRQCD混合物的这种特殊调整导致对 χ c 1 和 χ c 2 极化，这是唯一尚未测量的可观测值：它们应该彼此之间以及与J / ψ 极化，这是全球石英产量的一个显着例外。 χ c 1 ， χ c 2 和J / ψ 极化，补充了观察到的动量依赖性，是NRQCD的决定性探针。

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