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Production of heavy quarkonia in hadronic experiments

机译:强子实验中产生重氧化钾

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摘要

The phenomenology of the production of P-wave chi (c,b) mesons and S-wave eta (c,b) mesons in highenergy hadron-hadron collisions was studied on the basis of nonrelativistic quantum chromodynamics (NRQCD). Available experimental data on chi (c) -meson production were analyzed, and nonperturbative NRQCDmatrix elements were determined from a fit to these data. It is shown that the observed transversemomentum (pT) spectrum of chi (c) mesons is basically formed by color-singlet contributions. At the same time, the ratio sigma(chi (c2))/sigma(chi (c1)) depends greatly on color-octet contributions; this ratio therefore becomes a highly sensitive tool for separating different NRQCD contributions. Predictions for chi (b) -meson production are obtained on the basis of NRQCD scaling rules. For the case of eta (c) -meson production, it is shown that the observed cross sections agree with the color-singlet model featuring phenomenological parameters.
机译:在非相对论量子色谱动力学(NRQCD)的基础上,研究了高能强子-强子碰撞中产生P波chi(c,b)介子和S波eta(c,b)介子的现象学。分析了有关chi(c)介子产生的可用实验数据,并根据对这些数据的拟合确定了非扰动NRQCD矩阵元素。结果表明,观察到的chi(c)介子的横向动量(pT)光谱基本上是由彩色-单峰贡献形成的。同时,sigma(chi(c2))/ sigma(chi(c1))之比在很大程度上取决于色八位字节的贡献。因此,该比率成为区分不同NRQCD贡献的高度敏感的工具。根据NRQCD缩放规则,获得了chi(b)介子产生的预测。对于eta(c)介子产生的情况,表明观察到的横截面与以现象学参数为特征的颜色-单峰模型相符。

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