在 Tevatron 和 LHC 上进行 Υ(1S,2S,3S)的末级领头阶产额和极化的研究。

Complete next-to-leading-order study on the yield and polarization of Υ(1S,2S,3S) at the Tevatron and LHC.

机构信息

Institute of High Energy Physics, Chinese Academy of Sciences, P.O. Box 918(4), Beijing 100049, China.

出版信息

Phys Rev Lett. 2014 Jan 24;112(3):032001. doi: 10.1103/PhysRevLett.112.032001.

DOI:10.1103/PhysRevLett.112.032001

Abstract

Based on the nonrelativistic QCD factorization scheme, we present the first complete next-to-leading-order study on the yield and polarization of Υ(1S,2S,3S) hadroproduction. By using the color-octet long-distance matrix elements obtained from fits of the experimental measurements on Υ yield and polarization at the Tevatron and LHC, our results can explain the measurements on the yield very well, and for the polarizations of Υ(1S,2S,3S), they are in (good, good, bad) agreement with recent CMS measurement, but still have some distance from the CDF measurement.

摘要

基于非相对论性 QCD 因子化方案，我们首次对 Υ(1S,2S,3S)强子产生的产额和极化进行了完整的次领头阶研究。通过使用从 Tevatron 和 LHC 上 Υ 产额和极化的实验测量拟合得到的颜色八重态长程矩阵元，我们的结果可以很好地解释产额的测量，而对于 Υ(1S,2S,3S)的极化，它们与最近 CMS 的测量结果（在好、好、差）一致，但与 CDF 的测量仍有一定差距。