Brambilla Nora, Chung Hee Sok, Vairo Antonio
Physik-Department, Technische Universität München, James-Franck-Strasse 1, 85748 Garching, Germany.
Institute for Advanced Study, Technische Universität München, Lichtenbergstrasse 2 a, 85748 Garching, Germany.
Phys Rev Lett. 2021 Feb 26;126(8):082003. doi: 10.1103/PhysRevLett.126.082003.
We compute the color-singlet and color-octet nonrelativistic QCD (NRQCD) long-distance matrix elements for inclusive production of P-wave quarkonia in the framework of potential NRQCD. In this way, the color-octet NRQCD long-distance matrix element can be determined without relying on measured cross section data, which has not been possible so far. We obtain inclusive cross sections of χ_{cJ} and χ_{bJ} at the LHC, which are in good agreement with data. In principle, the formalism developed in this Letter can be applied to all inclusive production processes of heavy quarkonia.
我们在势非相对论量子色动力学（NRQCD）框架下计算了用于P波夸克偶素 inclusive 产生的色单态和色八重态非相对论量子色动力学（NRQCD）长程矩阵元。通过这种方式，色八重态NRQCD长程矩阵元可以在不依赖测量截面数据的情况下确定，而这在迄今为止是不可能的。我们获得了大型强子对撞机（LHC）上χ_{cJ}和χ_{bJ}的 inclusive 截面，它们与数据吻合良好。原则上，本信中发展的形式体系可应用于所有重夸克偶素的 inclusive 产生过程。
