Dror Jeff A, Lasenby Robert, Pospelov Maxim
Department of Physics, LEPP, Cornell University, Ithaca, New York 14853, USA.
Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, Ontario N2L 2Y5, Canada.
Phys Rev Lett. 2017 Oct 6;119(14):141803. doi: 10.1103/PhysRevLett.119.141803. Epub 2017 Oct 4.
We derive new constraints on light vectors coupled to standard model (SM) fermions, when the corresponding SM current is broken by the chiral anomaly. The cancellation of the anomaly by heavy fermions results, in the low-energy theory, in Wess-Zumino-type interactions between the new vector and the SM gauge bosons. These interactions are determined by the requirement that the heavy sector preserves the SM gauge groups and lead to (energy/vector mass)^{2} enhanced rates for processes involving the longitudinal mode of the new vector. Taking the example of a vector coupled to a vector coupled to SM baryon number, Z decays and flavor-changing neutral current meson decays via the new vector can occur with (weak scale/vector mass)^{2} enhanced rates. These processes place significantly stronger coupling bounds than others considered in the literature, over a wide range of vector masses.
当相应的标准模型（SM）流因手征反常而破缺时，我们推导出了与标准模型费米子耦合的轻矢量的新约束条件。在低能理论中，重费米子对反常的抵消导致了新矢量与标准模型规范玻色子之间出现韦西-祖米诺型相互作用。这些相互作用由重子部分保持标准模型规范群的要求所决定，并导致涉及新矢量纵向模式的过程的速率增强了(能量/矢量质量)² 。以与标准模型重子数耦合的矢量为例，Z玻色子通过新矢量衰变以及味改变中性流介子衰变可以以(弱电标度/矢量质量)² 增强的速率发生。在很宽的矢量质量范围内，这些过程比文献中考虑的其他过程给出了显著更强的耦合限制。
