论文标题
$ e^+e^ - \ to h \，x $ cross部分的分解，$ z_h $，$ p_t $和推力，在$ 2 $ -JET限制中
Factorization of $e^+e^- \to H \, X$ cross section, differential in $z_h$, $P_T$ and thrust, in the $2$-jet limit
论文作者
论文摘要
当考虑到外向发出的强子的横向动量相对于推力轴时，将单个强子产生的横截面分配为$ e^+e^ - $ nihihilations是一项高度不重要的任务。我们在一个方案中工作，该方案允许将$ e^+e^ - \至Hx $横截面作为可计算的硬系数和横向动量依赖（TMD）碎片函数的卷积。 $ z_h $，$ p_t $和推力的差异将被赋予扰动理论的所有订单，并明确计算为领先顺序（NLO）旁边的订单（NLO）和领先日志（NLL）精度附近。从我们的计算中获得的预测，应用最简单，最自然的ANSATZ对TMD的非扰动部分进行建模，这与Belle协作的实验测量非常一致。 The factorization scheme we propose relates the TMD parton densities defined in 1-hadron and 2-hadron processes, restoring the possibility to perform global phenomenological studies of TMD physics including experimental data from semi-inclusive deep inelastic scattering, Drell-Yan processes, $e^+e^- \to H_1 H_2 X$ and $e^+e^- \to HX$ annihilations.
Factorizing the cross section for single hadron production in $e^+e^-$ annihilations is a highly non trivial task when the transverse momentum of the outgoing hadron with respect to the thrust axis is taken into account. We work in a scheme that allows to factorize the $e^+e^- \to HX$ cross section as a convolution of a calculable hard coefficient and a Transverse Momentum Dependent (TMD) fragmentation function. The result, differential in $z_h$, $P_T$ and thrust, will be given to all orders in perturbation theory and explicitly computed to Next to Leading Order (NLO) and Next to Leading Log (NLL) accuracy. The predictions obtained from our computation, applying the simplest and most natural ansatz to model the non-perturbative part of the TMD, are in exceptional agreement with the experimental measurements of the BELLE Collaboration. The factorization scheme we propose relates the TMD parton densities defined in 1-hadron and 2-hadron processes, restoring the possibility to perform global phenomenological studies of TMD physics including experimental data from semi-inclusive deep inelastic scattering, Drell-Yan processes, $e^+e^- \to H_1 H_2 X$ and $e^+e^- \to HX$ annihilations.
