Gauge-independent approach to resonant transition amplitudes.
Gauge-independent approach to resonant transition amplitudes.
复制标题
与规范无关的谐振跃迁幅度方法。
DOI：
10.1103/physrevd.53.2128
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Pilaftsis
中科院分区：
文献类型：
--
作者：
Papavassiliou;Pilaftsis
基于箍缩技术，我们提出了一种新的与规范无关的方法来计算具有非守恒外电流的共振跃迁振幅。在2{r_arrow}2和2{r_arrow}3散射过程的背景下，我们明确地表明，导出的解析结果尊重U（1）{sub e}{sub m}规范对称性，并且不依赖于SU（2）{sub {ital L}}规范固定的选择。我们的分析方法对待，在平等的基础上，费米子以及玻色子的贡献，规范玻色子传播，不包含任何剩余的类空阈值条款，显示正确的高能么正性行为，承认重整化，并满足一些其他所需的属性，包括光学定理。尽管我们的分析主要集中在标准模型规范玻色子上，但我们的方法可以很容易地扩展到顶夸克，并直接应用于新物理学的可重整化模型中存在的不稳定粒子的研究。美国物理学会（American Physical Society）
We present a new gauge-independent approach to resonant transition amplitudes with nonconserved external currents, based on the pinch technique method. In the context of 2{r_arrow}2 and 2{r_arrow}3 scattering processes we show explicitly that the analytic results derived respect U(1){sub e}{sub m} gauge symmetry and do not depend on the choice of the SU(2){sub {ital L}} gauge fixing. Our analytic approach treats, on equal footing, fermionic as well as bosonic contributions to the resummed gauge boson propagators, does not contain any residual spacelike threshold terms, shows the correct high-energy unitarity behavior, admits renormalization, and satisfies a number of other required properties, including the optical theorem. Even though our analysis has mainly focused on the standard model gauge bosons, our method can easily be extended to the top quark, and be directly applied to the study of unstable particles present in renormalizable models of new physics. {copyright} {ital 1996 The American Physical Society.}