Heavy QCD axion in b→s transition: Enhanced limits and projections
Heavy QCD axion in b→s transition: Enhanced limits and projections
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b→s 跃迁中的重 QCD 轴子：增强的限制和投影
DOI：
10.1103/physrevd.104.055036
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发表时间：
2021
影响因子：
5
通讯作者：
Tobioka Kohsaku
中科院分区：
文献类型：
--
作者：
Chakraborty Sabyasachi;Kraus Manfred;Loladze Vazha;Okui Takemichi;Tobioka Kohsaku
我们研究了一个“重”QCD 轴子，其与标准模型的耦合主要由 aGG~ 但具有。这是很好的动机，因为它可以解决强问题，同时避免轴子质量问题。由于其与光子和轻子的耦合受到抑制，它也对其实验研究提出了有趣的挑战。这种质量约为 GeV 的轴子在运动学上是无法接近的，或者受到除了工厂之外的大多数实验探针的限制。我们通过首次执行必要的 2 环计算以及对现有分析策略的一些改进来研究跃迁作为重 QCD 轴子的强大探针。我们发现一些现有的限制至少提高了一个数量级。我们还证明了该界限对于未知的紫外线物理是稳健的。对于 Belle II 实验即将发布的数据集，我们提供了未来可达数 TeV 的预测，这与质量问题相关。
We study a “heavy” QCD axion whose coupling to the standard model is dominated by aGG˜ but with. This is well motivated as it can solve the strongproblem while evading the axion quality problem. It also poses interesting challenges for its experimental search due to its suppressed couplings to photons and leptons. Such axion with mass around a GeV is kinematically inaccessible or poorly constrained by most experimental probes except-factories. We studytransitions as a powerful probe of the heavy QCD axion by performing necessary 2-loop calculations for the first time, together with some improvement on the existing analysis strategy. We find some of the existing limits are enhanced by at least an order of magnitude. We also demonstrate that the bounds are robust against unknown UV physics. For forthcoming data sets of the Belle II experiment, we provide a projection thatof a few TeV is within its future reach, which is relevant to the quality problem.