标题： 夸克偶素在非相对论QCD因子化框架中的极化 显示英文标题

标题： Quarkonium Polarization in the NRQCD Factorization Framework

摘要： 非相对论QCD因子化方法用于计算重夸克介子的包容性产生，为介子态的极化给出了明确的预测。 极化态的因子化公式可以通过使用阈值展开方法计算短距离系数，然后利用非相对论QCD的对称性来简化NRQCD矩阵元。 NRQCD因子化框架的一个特别显著的预测是，在Tevatron产生的即时ψ和ψ'在大横向动量下应主要为横向极化。 显示英文摘要

摘要： The NRQCD factorization approach for calculating inclusive production of heavy quarkonium gives unambiguous predictions for the polarization of quarkonium states. The factorization formula for polarized states can be obtained by using the threshold expansion method to calculate the short-distance coefficients and then using symmetries of NRQD to reduce the NRQCD matrix elements. A particularly dramatic prediction of the NRQCD factorization framework is that prompt psi's and psi-primes's produced at the Tevatron should be predominantly transversely polarized at large transverse momentum.