The QCD axion, precisely
The QCD axion, precisely
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DOI：
10.1007/jhep01(2016)034
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发表时间：
2016-01-07
影响因子：
5.4
通讯作者：
Villadoro, Giovanni
中科院分区：
文献类型：
--
作者：
di Cortona, Giovanni Grilli;Hardy, Edward;Villadoro, Giovanni
我们展示了如何使用第一原理QCD计算的QCD轴子的几个属性可以在高精度提取。将手征微扰理论中的非线性光学结果与格点QCD结果相结合，可以精确地重建出完整的轴子势、质量以及与光子的耦合。轴子与核子的耦合也可以可靠地导出，不确定性小于10%。这里提出的方法允许精度进一步提高的不确定性轻夸克质量和有效的理论耦合减少。我们还计算了轴子势和它的质量的有限温度依赖的交叉区域。对于较高温度，我们指出了传统瞬子方法的不可靠性，并研究了它对轴子剩余丰度计算的影响。
We show how several properties of the QCD axion can be extracted at high precision using only first principle QCD computations. By combining NLO results obtained in chiral perturbation theory with recent Lattice QCD results the full axion potential, its mass and the coupling to photons can be reconstructed with percent precision. Axion couplings to nucleons can also be derived reliably, with uncertainties smaller than ten percent. The approach presented here allows the precision to be further improved as uncertainties on the light quark masses and the effective theory couplings are reduced. We also compute the finite temperature dependence of the axion potential and its mass up to the crossover region. For higher temperature we point out the unreliability of the conventional instanton approach and study its impact on the computation of the axion relic abundance.