大型强子对撞机作为轴子工厂：通过奇异希格斯衰变探究μ子反常磁矩（g-2）μ的轴子解释

LHC as an Axion Factory: Probing an Axion Explanation for (g-2)_{μ} with Exotic Higgs Decays.

作者信息

Bauer Martin, Neubert Matthias, Thamm Andrea

机构信息

Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany.

PRISMA Cluster of Excellence & MITP, Johannes Gutenberg University, 55099 Mainz, Germany.

出版信息

Phys Rev Lett. 2017 Jul 21;119(3):031802. doi: 10.1103/PhysRevLett.119.031802.

DOI:10.1103/PhysRevLett.119.031802

PMID:28777600

Abstract

We argue that a large region of so-far unconstrained parameter space for axionlike particles (ALPs), where their couplings to the standard model are of order (0.01-1) TeV^{-1}, can be explored by searches for the exotic Higgs decays h→Za and h→aa in run 2 of the LHC. Almost the complete region in which ALPs can explain the anomalous magnetic moment of the muon can be probed by searches for these decays with subsequent decay a→γγ, even if the relevant couplings are loop suppressed and the a→γγ branching ratio is less than 1.

摘要

我们认为，对于类轴子粒子（ALP）而言，目前尚未受到约束的一大片参数空间，即其与标准模型的耦合量级为（0.01 - 1）TeV⁻¹ 的区域，可以通过在大型强子对撞机（LHC）的第二轮运行中搜索奇异希格斯衰变h→Za和h→aa来进行探索。即使相关耦合受到圈抑制且a→γγ分支比小于1，通过搜索这些衰变及其后续衰变a→γγ，几乎可以探测到ALP能够解释μ子反常磁矩的整个区域。