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ep对撞机上顶夸克产生的共线方法

Collinear approach for top quark production at ep colliders

G. R. Boroun

发表信息：
Eur. Phys. J. Plus (2023) 138:252
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摘要：

对在未来圆形强子-电子对撞机（FCC-he）和大型强子电子对撞机（LHeC）上共线产生$t\overline{t}$的方法进行了近似分析研究。为了研究重夸克的产生过程，在宽的$Q^{2}$范围内采用了共线广义双渐近标度（DAS）方法。在高非弹性条件下，导出了FCC-he（对于$Q^{2}{\geq}m^{2}_{t}$）和LHeC（对于$Q^{2}{\leq}m^{2}_{t}$）质心能量下顶夸克对产生的约化截面.这些结果对将来的质心能量前沿对撞机实验和改进Bjorken变量$x$低值运动学唯象模型具有参考价值。在低$x$下得到了DIS中重夸克产生的胶子密度的演化，以包括重夸克质量的影响。对这些结果的非线性修正表明，对于$Q^{2}{\propto}m^{2}_{t}$，关于顶夸克质量的非线性修正非常小。

英文摘要：

An approximately analysis study of the collinear approach for $t\overline{t}$ production at the Future Circular Collider hadron-electron (FCC-he) and the Large Hadron electron Collider (LHeC) is performed. To study heavy quark production processes, the collinear generalized double asymptotic scaling (DAS) approach in a wide rang of $Q^{2}$ is used. The reduced cross sections for top quark pair production at the FCC-he (for $Q^{2}{\geq}m^{2}_{t}$) and LHeC (for $Q^{2}{\leq}m^{2}_{t}$) center-of-mass energies at the high inelasticity are derived. These results may be considering for both the future collider experiments at center-of-mass energy frontier and the improvement of the phenomenological models on kinematics of low values of the Bjorken variable $x$. The evolution of the gluon density for heavy-quark production in DIS is obtained at low $x$ to include effects of heavy-quark masses. A nonlinear modification of these results shown that the nonlinear corrections, with respect to the top quark mass, are very small for $Q^{2}{\propto}m^{2}_{t}$.

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