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arXiv 2603.03423hep-ph
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单粒子性界与求和规则在SMEFT中

Unitarity bounds and sum rules in the SMEFT

Università degli Studi di Padova(帕多瓦大学);Istituto Nazionale di Fisica Nucleare, Sezione di Padova(意大利国家核物理研究所帕多瓦分部);Universität Zürich(苏黎世大学)

Luigi C. Bresciani, Paride Paradisi, Andrea Sainaghi

AI总结:

本文通过旋量螺旋度技术重新评估SMEFT中单粒子性界,并利用求和规则加强四费米子算符的约束。

摘要:

我们对维度六标准模型有效场论中的微扰单粒子性界进行了全面重新评估,利用基于旋量螺旋度技术的新方法,推导出通用N→M散射幅的部分波单粒子性界。我们发现,在几种情况下,这些理论约束在几TeV以上的能量标度下已经与或甚至强于相应的实验约束。这尤其适用于在现实味假设下的四费米子算符,其中通过利用求和规则可以进一步加强单粒子性界。

英文摘要:

We present a comprehensive reassessment of perturbative unitarity bounds in the dimension-six Standard Model Effective Field Theory, exploiting a new formalism based on spinor-helicity techniques to derive partial-wave unitarity bounds for generic $N \to M$ scattering amplitudes. We find that, in several cases, these theoretical constraints are already competitive with, or even stronger than, the corresponding experimental bounds for energy scales above a few TeV. This is especially the case for four-fermion operators under realistic flavor assumptions, where unitarity bounds can be further strengthened by exploiting sum rules. These results provide a valuable and timely contribution towards the ambitious program of new-physics searches with minimal theoretical priors supplemented by restrictive, yet general, first-principles criteria.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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