Aloni Daniel, Soreq Yotam, Williams Mike
Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot, Israel 7610001.
Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Phys Rev Lett. 2019 Jul 19;123(3):031803. doi: 10.1103/PhysRevLett.123.031803.
We present a novel data-driven method for determining the hadronic interaction strengths of axionlike particles (ALPs) with QCD-scale masses. Using our method, it is possible to calculate the hadronic production and decay rates of ALPs, along with many of the largest ALP decay rates to exclusive final states. To illustrate the impact on QCD-scale ALP phenomenology, we consider the scenario where the ALP-gluon coupling is dominant over the ALP coupling to photons, electroweak bosons, and all fermions for m_{π}≲m_{a}≲3 GeV. We emphasize, however, that our method can easily be generalized to any set of ALP couplings to standard model particles. Finally, using the approach developed here, we provide calculations for the branching fractions of η_{c}→VV decays; i.e., η_{c} decays into two vector mesons, which are consistent with the known experimental values.
我们提出了一种全新的数据驱动方法，用于确定具有 QCD 尺度质量的类轴子粒子（ALP）的强子相互作用强度。使用我们的方法，可以计算 ALP 的强子产生率和衰变率，以及许多到排他性末态的最大 ALP 衰变率。为了说明对 QCD 尺度 ALP 现象学的影响，我们考虑这样一种情形：对于 (m_{\pi}\lesssim m_{a}\lesssim 3,\text{GeV})，ALP 与胶子的耦合比 ALP 与光子、电弱玻色子以及所有费米子的耦合占主导地位。然而，我们强调，我们的方法可以很容易地推广到 ALP 与标准模型粒子的任何一组耦合。最后，使用这里开发的方法，我们给出了 (\eta_{c}\to VV) 衰变（即 (\eta_{c}) 衰变成两个矢量介子）的分支比计算结果，这些结果与已知的实验值一致。
