HELAC-Onia: An automatic matrix element generator for heavy quarkonium physics

被引：123

作者：

Shao, Hua-Sheng ^{[1
,2
,3
]}

机构：

[1] Peking Univ, Dept Phys, Beijing 100871, Peoples R China

[2] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China

[3] CERN, PH Dept, TH Unit, CH-1211 Geneva 23, Switzerland

来源：

COMPUTER PHYSICS COMMUNICATIONS | 2013年 / 184卷 / 11期

基金：

中国国家自然科学基金;

关键词：

Quarkonium helicity amplitudes; NRQCD; Dyson-Schwinger equations; Off-shell currents; PHASE-SPACE; HADROPRODUCTION; ALGORITHM; PROGRESS; BCVEGPY;

D O I：

10.1016/j.cpc.2013.05.023

中图分类号：

TP39 [计算机的应用];

学科分类号：

081203 ; 0835 ;

摘要：

By the virtues of the Dyson-Schwinger equations, we upgrade the published code HELAC to be capable to calculate the heavy quarkonium helicity amplitudes in the framework of NRQCD factorization, which we dub HELAC-Onia. We rewrote the original HELAC to make the new program be able to calculate helicity amplitudes of multi P-wave quarkonium states production at hadron colliders and electron-positron colliders by including new P-wave off-shell currents. Therefore, besides the high efficiencies in computation of multi-leg processes within the Standard Model, HELAC-Onia is also sufficiently numerical stable in dealing with P-wave quarkonia (e.g. Xc.b) and P-wave color-octet intermediate states. To the best of our knowledge, it is a first general-purpose automatic quarkonium matrix elements generator based on recursion relations on the market. (C) 2013 The Author. Published by Elsevier B.V. All rights reserved.

引用

页码：2562 / 2570

页数：9

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