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arXiv 1101.4665hep-ph
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重子洗出、电弱相变和微扰理论

Baryon Washout, Electroweak Phase Transition, and Perturbation Theory

Hiren H. Patel, Michael J. Ramsey-Musolf

摘要:

我们分析了传统的微扰处理的sphaleron诱导的重子数洗出相关的电弱重子生成,并表明它不是规范无关的,由于未能一贯实施的尼尔森恒等式订单订单的微扰理论。我们提供了一个规范独立的标准重子数保存在传统的(规范依赖)成功的电弱重子生成所需的标准。我们还回顾了导致保存标准的参数,并分析了在获得数值界的理论不确定性的几个来源。在各种超出标准模型的情况下,一个现实的微扰处理可能需要完整的双回路有限温度有效势和单回路sphaleron率的知识。

英文摘要:

We analyze the conventional perturbative treatment of sphaleron-induced baryon number washout relevant for electroweak baryogenesis and show that it is not gauge-independent due to the failure of consistently implementing the Nielsen identities order-by-order in perturbation theory. We provide a gauge-independent criterion for baryon number preservation in place of the conventional (gauge-dependent) criterion needed for successful electroweak baryogenesis. We also review the arguments leading to the preservation criterion and analyze several sources of theoretical uncertainties in obtaining a numerical bound. In various beyond the standard model scenarios, a realistic perturbative treatment will likely require knowledge of the complete two-loop finite temperature effective potential and the one-loop sphaleron rate.

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