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arXiv 1110.2188hep-phhep-lathep-th
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非微扰质子稳定性

Non-perturbative proton stability

Adam Martin, Gerben C. Stavenga

摘要:

质子衰变是大统一模型的一个通用预测,因此是检测统一的存在或对大统一模型设定限制的重要渠道。目前质子寿命的界限约为10^33年,这对大统一理论的尺度设定了严格的限制。这些限制是在关于强子矩阵元的大小的“合理”假设下得到的。本文给出了质子手征袋模型中强子矩阵元的非微扰计算。我们认为,由于非微扰QCD,存在矩阵元的指数抑制,抑制了质子衰变的数量级--可能是O(10^-10)。这种抑制存在于小质量的夸克中,这是由于QCD的手征对称性破缺。这种抑制对大统一模型有明显的影响,并可能使几种情景复苏。

英文摘要:

Proton decay is a generic prediction of GUT models and is therefore an important channel to detect the existence of unification or to set limits on GUT models. Current bounds on the proton lifetime are around 10^33 years, which sets stringent limits on the GUT scale. These limits are obtained under `reasonable' assumptions about the size of the hadronic matrix elements. In this paper we present a non-perturbative calculation of the hadronic matrix elements within the chiral bag model of the proton. We argue that there is an exponential suppression of the matrix elements, due to non-perturbative QCD, that stifles proton decay by orders of magnitude -- potentially O(10^-10). This suppression is present for small quark masses and is due to the chiral symmetry breaking of QCD. Such a suppression has clear implications for GUT models and could resuscitate several scenarios.

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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