SANCnews: Sector f f b b

Abstract
In this paper we describe the implementation of processes f_1over(f, ̄)_1Z Z → 0 and f_1over(f, ̄)_1H Z → 0 into the framework of SANC system. The f_1stands for a massless fermion f whose mass is kept non-zero only in arguments of ln functions and →0 means that all 4-momenta flow inwards. The derived scalar form factors can be used for any cross channel after an appropriate permutation of their arguments (s, t, u). We present the covariant and helicity amplitudes for these processes...

Title of program: SANC
Catalogue Id: ADXK_v1_1

Nature of problem
Automatic calculation of pseudo- and realistic observables for various processes and decays in the Standard Model of Electroweak interactions, QCD and QED at one-loop precision level. Form factors and helicity amplitudes free of UV divergences are produced. For exclusion of IR singularities the soft photon emission is included.

Versions of this program held in the CPC repository in Mendeley Data
ADXK_v1_0; SANC; 10.1016/j.cpc.2005.12.006
ADXK_v1_1; SANC; 10.1016/j.cpc.2007.06.006

This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)

**摘要**
本文阐述了将过程$(f, ar{f})_1 ZZ o 0$与$(f, ar{f})_1 HZ o 0$嵌入SANC（SANC）系统框架的实现细节。其中$f_1$代表无质量费米子$f$，仅在对数函数的自变量中保留其非零质量；而$ o 0$表示所有四动量均向内流动。经适当置换其运动学变量（s、t、u）后，所导出的标量形状因子可应用于任意交叉道。本文还给出了上述过程的协变振幅与螺旋度振幅……

**程序名称**：SANC（SANC）
**目录编号**：ADXK_v1_1

**问题特性**：
本程序可在单圈精度水平下，自动计算电弱相互作用标准模型、量子色动力学（QCD）与量子电动力学（QED）中各类过程与衰变的唯象与真实可观测量，可生成无紫外发散的形状因子与螺旋度振幅；为消除红外奇异点，程序已包含软光子辐射修正。

**Mendeley数据中的CPC（CPC）程序库版本**：
ADXK_v1_0；SANC（SANC）；10.1016/j.cpc.2005.12.006
ADXK_v1_1；SANC（SANC）；10.1016/j.cpc.2007.06.006

本程序源自贝尔法斯特女王大学馆藏的CPC（CPC）程序库（1969-2019年）。