排序方式: 共有21条查询结果,搜索用时 15 毫秒
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A hypergeometric function is proposed to calculate the scalar integrals of Feynman diagrams.In this study,we verify the equivalence between the Feynman parametrization and the hypergeometric technique for the scalar integral of the three-loop vacuum diagram with four propagators.The result can be described in terms of generalized hypergeometric functions of triple variables.Based on the triple hypergeometric functions,we establish the systems of homogeneous linear partial differential equations(PDEs)satisfied by the scalar integral of three-loop vacuum diagram with four propagators.The continuation of the scalar integral from its convergent regions to entire kinematic domains can be achieved numerically through homogeneous linear PDEs by applying the element method. 相似文献
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共轭梯度法是一类具有广泛应用的求解大规模无约束优化问题的方法. 提出了一种新的非线性共轭梯度(CG)法,理论分析显示新算法在多种线搜索条件下具有充分下降性. 进一步证明了新CG算法的全局收敛性定理. 最后,进行了大量数值实验,其结果表明与传统的几类CG方法相比,新算法具有更为高效的计算性能. 相似文献
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李少炜 范道金 龚明 叶杨森 陈厦微 吴玉林 关卉杰 邓辉 荣皓 黄合良 查辰 严凯 郭少俊 钱浩然 张海斌 陈福升 朱庆玲 赵有为 王石宇 应翀 曹思睿 余家乐 梁福田 徐昱 林金 郭成 孙丽华 李娜 韩廉琛 彭承志 朱晓波 潘建伟 《中国物理快报》2022,(3):11-28
The development of high-fidelity two-qubit quantum gates is essential for digital quantum computing. Here,we propose and realize an all-microwave parametric controlled-Z(CZ) gates by coupling strength modulation in a superconducting Transmon qubit system with tunable couplers. After optimizing the design of the tunable coupler together with the control pulse numerically, we experimentally realized a 100 ns CZ gate with high fidelity of 99.38%±0.34% and the control error being 0.1%. We note that ... 相似文献
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螺纹加工方法最常见的是数控车削加工.探讨数控车削加工时根据不同的加工精度、不同的加工材料,分别选取不同的编程指令、不同的工件装夹方式、不同的加工刀具、不同的切削参数等,在实际螺纹数控车削加工中的合理性.探析螺纹数控加工的特殊性,探索如何实现精确控制螺纹数控车削加工,以及在实际加工中生产出高效、高精、稳定可靠的螺纹产品. 相似文献
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In this paper, we calculate the rare top quark decay t → ch in a supersymmetric extension of the Standard Model where baryon and lepton numbers are local gauge symmetries. Adopting reasonable assumptions on the parameter space, we nd that the branching ratios of t→ch can reach 10-3, which could be detected in the near future. 相似文献