Proton decay matrix elements on the lattice at physical pion mass
Proton decay matrix elements on the lattice at physical pion mass
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DOI：
10.1103/physrevd.105.074501
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发表时间：
2021-11
影响因子：
5
通讯作者：
Jun-sik Yoo;Y. Aoki;P. Boyle;T. Izubuchi;A. Soni;S. Syritsyn
中科院分区：
文献类型：
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作者：
Jun-sik Yoo;Y. Aoki;P. Boyle;T. Izubuchi;A. Soni;S. Syritsyn
质子衰变是大统一理论(GUT)的一个主要预测，它的观测将表明重子发生所需的重子数破坏。几十年来对质子衰变的研究限制了它的速度，并排除了一些最简单的肠道模型。除了破坏重子数的相互作用外，这个速率还取决于质子与衰变过程中产生的介子或轻子之间的跃迁幅度，这些介子或轻子是三夸克算符的矩阵元素。我们报道了在具有物理光和奇夸克质量、晶格间距分别为0.14和0.20fm的晶格上，对研究最多的两体衰变通道到介子和反轻子的这些矩阵元的非微扰计算。我们进行非微扰重整化和激发态分析来控制相关的系统效应。我们的结果与以前用较重夸克质量进行的晶格计算基本一致，从而消除了由于强子结构与夸克质量有关而排除一些简单的直肠理论的模糊性。
Proton decay is a major prediction of Grand-Unified Theories (GUT) and its observation would indicate baryon number violation that is required for baryogenesis. Many decades of searching for proton decay have constrained its rate and ruled out some of the simplest GUT models. Apart from the baryon number-violating interactions, this rate also depends on transition amplitudes between the proton and mesons or leptons produced in the decay, which are matrix elements of three-quark operators. We report nonperturbative calculation of these matrix elements for the most studied two-body decay channels into a meson and antilepton done on a lattice with physical light and strange quark masses and lattice spacings $a\approx0.14$ and 0.20 fm. We perform nonperturbative renormalization and excited state analysis to control associated systematic effects. Our results largely agree with previous lattice calculations done with heavier quark masses and thus remove ambiguity in ruling out some simple GUT theories due to quark mass dependence of hadron structure.